https://greenenergy.net/Free interactive energy calculators (solar, wind, hydro, gas, heat pumps, EVs, batteries), live-data maps and in-depth profiles of 200+ countries — with shareable, editable reports.enhttps://greenenergy.net/learn/are-electric-cars-really-greener/https://greenenergy.net/learn/are-electric-cars-really-greener/Battery manufacturing, grid mix, mining and recycling: what life-cycle studies show about EV vs petrol and diesel CO₂, with breakeven distances by country.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/learn/are-solar-panels-worth-it/https://greenenergy.net/learn/are-solar-panels-worth-it/A numbers-first guide to whether home solar pays: costs, payback periods, self-consumption, export tariffs, batteries and the cases where it doesn't.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/learn/best-angle-for-solar-panels/https://greenenergy.net/learn/best-angle-for-solar-panels/Optimal solar panel tilt and orientation for any latitude, how much you lose on flat or east-west roofs, seasonal angles, trackers and snow.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/learn/bioenergy-and-biogas-explained/https://greenenergy.net/learn/bioenergy-and-biogas-explained/How bioenergy works: wood heating, biomass power, anaerobic digestion, biomethane and biofuels. Yields, costs, carbon accounting and the land-use debate.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/learn/carbon-intensity-of-electricity/https://greenenergy.net/learn/carbon-intensity-of-electricity/What grid carbon intensity means, how it is calculated, values by country and power source, average vs marginal emissions, and how to use it for your footprint.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/learn/coal-phase-out-around-the-world/https://greenenergy.net/learn/coal-phase-out-around-the-world/Coal still generates a third of the world's electricity. Which countries are phasing it out, who is still building plants, and what replaces coal in practice.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/learn/electric-cars-charging-guide/https://greenenergy.net/learn/electric-cars-charging-guide/Everything about charging an EV: AC vs DC, kW vs kWh, real charging times, home vs public costs, charging curves, battery health and smart charging.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/learn/energy-storage-technologies-compared/https://greenenergy.net/learn/energy-storage-technologies-compared/Lithium-ion, LFP, sodium-ion, flow batteries, pumped hydro, compressed air, thermal and hydrogen storage compared on cost, efficiency, duration and lifetime.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/learn/energy-units-cheat-sheet/https://greenenergy.net/learn/energy-units-cheat-sheet/Every energy and power unit in one place: conversion tables for kWh, MJ, BTU, therms, toe, barrels of oil, plus fuel energy contents and worked examples.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/learn/geothermal-energy-explained/https://greenenergy.net/learn/geothermal-energy-explained/How geothermal works, from Icelandic power plants to enhanced geothermal systems and ground-source heat pumps: resources, costs, emissions and outlook.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/learn/green-hydrogen-explained/https://greenenergy.net/learn/green-hydrogen-explained/How green hydrogen is made, electrolyser types, efficiency losses, the real cost per kg, and which uses make sense: steel, ammonia, shipping, not home heating.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/learn/heat-pump-in-cold-climates/https://greenenergy.net/learn/heat-pump-in-cold-climates/Do heat pumps work in freezing weather? Real COP data at −10 to −25 °C, defrost losses, sizing, backup heat and lessons from Norway, Finland and Canada.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/learn/heat-pumps-explained/https://greenenergy.net/learn/heat-pumps-explained/How heat pumps work, what COP and SCOP really mean, typical running costs versus gas, sizing rules and when a heat pump pays back. Worked examples included.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/learn/home-battery-storage-guide/https://greenenergy.net/learn/home-battery-storage-guide/How home batteries work, how many kWh you really need, LFP vs NMC, round-trip losses, cycle life and when a battery pays back, with worked examples.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/learn/home-insulation-guide/https://greenenergy.net/learn/home-insulation-guide/Which insulation saves most? U-values, heat loss maths, costs per m², payback for loft, wall, floor, windows and airtightness, with worked examples.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/learn/how-solar-panels-work/https://greenenergy.net/learn/how-solar-panels-work/How a solar panel turns sunlight into household electricity: the photovoltaic effect, cells, modules, inverters, losses and real-world yields explained.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/learn/how-the-power-grid-works/https://greenenergy.net/learn/how-the-power-grid-works/How electricity gets from power station to socket: voltage levels, frequency control, reserves, losses, markets and what changes as wind and solar grow.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/learn/how-to-cut-your-electricity-bill/https://greenenergy.net/learn/how-to-cut-your-electricity-bill/A data-driven guide to lowering your electricity bill: where the kWh go, which appliances cost most, tariffs, standby power, LED, solar, with worked numbers.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/learn/how-wind-turbines-work/https://greenenergy.net/learn/how-wind-turbines-work/How a wind turbine turns moving air into electricity: lift, the cube law, the Betz limit, power curves, gearboxes vs direct drive, control and capacity factor.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/learn/hydropower-explained/https://greenenergy.net/learn/hydropower-explained/Hydropower from first principles: the power formula, turbine types, run-of-river vs reservoir, pumped storage, costs, emissions, drought risk and micro-hydro.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/learn/kw-vs-kwh/https://greenenergy.net/learn/kw-vs-kwh/kW measures power (a rate), kWh measures energy (an amount). Clear examples for bills, solar panels, batteries and EV chargers, plus common mistakes.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/learn/lcoe-explained/https://greenenergy.net/learn/lcoe-explained/Levelised cost of electricity explained: the formula, discount rates, capacity factor, worked solar and gas examples, typical ranges and what LCOE leaves out.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/learn/natural-gas-and-the-energy-transition/https://greenenergy.net/learn/natural-gas-and-the-energy-transition/Natural gas in numbers: emissions vs coal, methane leakage, LNG, the 2022 price shock, gas in power, heat and industry, and how fast demand may fall.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/learn/nuclear-power-pros-and-cons/https://greenenergy.net/learn/nuclear-power-pros-and-cons/A balanced, data-driven look at nuclear power: emissions, safety record, waste, construction costs and delays, SMRs, and its role alongside renewables.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/learn/off-grid-solar-guide/https://greenenergy.net/learn/off-grid-solar-guide/Design an off-grid solar system step by step: load audit, worst-month sizing, battery autonomy, inverter and charge controller choice, generator backup, costs.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/learn/offshore-wind-explained/https://greenenergy.net/learn/offshore-wind-explained/How offshore wind farms work: turbine sizes, fixed vs floating foundations, capacity factors of 40–55%, cables, costs and the trade-offs against onshore wind.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/learn/renewable-vs-low-carbon-vs-clean/https://greenenergy.net/learn/renewable-vs-low-carbon-vs-clean/Renewable, low-carbon, clean, green, zero-emission: what each term really means, lifecycle CO₂ by technology, and why nuclear and biomass divide opinion.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/learn/small-wind-turbines-for-homes/https://greenenergy.net/learn/small-wind-turbines-for-homes/An honest guide to home wind turbines: what a 1–20 kW turbine really produces, why rooftop turbines disappoint, siting rules, costs and payback vs solar.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/learn/solar-panel-efficiency-explained/https://greenenergy.net/learn/solar-panel-efficiency-explained/What solar panel efficiency measures, typical values by technology, why 22% beats 20% only on small roofs, and how heat and light change real output.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/learn/the-global-energy-transition-in-numbers/https://greenenergy.net/learn/the-global-energy-transition-in-numbers/The energy transition in hard data: electricity mix, solar and wind growth, coal, emissions, primary energy and the gap to climate goals. Latest-year figures.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/learn/what-is-capacity-factor/https://greenenergy.net/learn/what-is-capacity-factor/Capacity factor explained: the formula, typical values for solar, wind, nuclear, hydro and gas, and how it differs from efficiency, with worked examples.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/learn/why-electricity-prices-spike/https://greenenergy.net/learn/why-electricity-prices-spike/Why wholesale power prices jump from €50 to €500/MWh: the merit order, gas setting the price, scarcity, negative prices, and what it means for your bill.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/calculators/carbon-footprint-calculator/https://greenenergy.net/calculators/carbon-footprint-calculator/Home energy on your own country's grid, heating, car, flights, diet and shopping, in tonnes CO₂e per person. Compares the result with your country, the world and the 1.5 °C target, and ranks the actions that cut most for you.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/calculators/energy-unit-converter/https://greenenergy.net/calculators/energy-unit-converter/Convert any amount of energy between joules, watt-hours, calories, BTU, therms, tonnes of oil or coal equivalent, barrels of oil equivalent, electronvolts and foot-pounds. Shows all units at once, with real-world equivalents.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/calculators/ev-charging-cost/https://greenenergy.net/calculators/ev-charging-cost/What does it cost to charge an electric car? Enter your battery, efficiency and mix of home, public AC and rapid DC charging to get the cost per charge, per 100 km and per month, including charging losses, compared with a petrol car.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/calculators/heat-pump-calculator/https://greenenergy.net/calculators/heat-pump-calculator/Models an air-source heat pump month by month for your climate: heat demand, COP at every outdoor temperature and flow temperature, electricity use, running cost versus your current boiler and CO₂ saved.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/calculators/lcoe-calculator/https://greenenergy.net/calculators/lcoe-calculator/Capex, fixed and variable O&M, fuel and heat rate, capacity factor, lifetime, WACC, construction time, degradation and carbon price → the levelized cost per MWh, broken down by component and compared across 11 technologies.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/calculators/micro-hydro-calculator/https://greenenergy.net/calculators/micro-hydro-calculator/Turn head and flow into kilowatts, kWh per month and payback. The model includes real penstock friction, part-load turbine efficiency, seasonal flow and a residual (environmental) flow, and recommends a turbine type.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/calculators/solar-battery-calculator/https://greenenergy.net/calculators/solar-battery-calculator/Simulates your solar panels, your household’s hourly demand and a home battery for all 8,760 hours of a real year at your location, then finds the battery size that actually pays off.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/calculators/solar-panel-calculator/https://greenenergy.net/calculators/solar-panel-calculator/Simulates every hour of a full year at your exact location using NASA satellite weather, then turns the energy into savings, payback time and CO₂ avoided.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/calculators/wind-turbine-calculator/https://greenenergy.net/calculators/wind-turbine-calculator/Pick a site and a turbine: we download a full year of hourly NASA wind at 50 m, shear it to your hub height, correct for air density and losses, and turn it into kWh, capacity factor, revenue and payback.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/calculators/battery-backup-time/https://greenenergy.net/calculators/battery-backup-time/Runtime of any battery (power station, home battery, UPS or 12 V bank) from capacity, depth of discharge, inverter losses, temperature and age, with Peukert’s law for lead-acid batteries.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/calculators/electricity-bill-calculator/https://greenenergy.net/calculators/electricity-bill-calculator/Build your household electricity bill from the appliances you actually use (or from your kWh), with flat, tiered or day/night tariffs, standing charge, levies and VAT. See which devices drive the cost.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/calculators/electricity-co2-calculator/https://greenenergy.net/calculators/electricity-co2-calculator/Converts any amount of electricity into CO₂ using the latest average grid carbon intensity of 210+ countries, and shows how the same kWh would score on cleaner and dirtier grids.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/calculators/npv-irr-energy-project/https://greenenergy.net/calculators/npv-irr-energy-project/A compact project-finance model for any power plant: revenues, opex, loan, tax and depreciation year by year, giving project and equity IRR, NPV, payback and debt-service cover ratios.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/calculators/ev-charging-time/https://greenenergy.net/calculators/ev-charging-time/Estimates how long an electric car takes to charge between any two states of charge, using the charger’s power, the car’s own AC and DC limits, a realistic DC taper curve above 50–80% and battery temperature.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/calculators/how-many-solar-panels/https://greenenergy.net/calculators/how-many-solar-panels/Turns your yearly kWh (or monthly bill) into the number of panels, system size and roof area you need, using NASA satellite sunshine for your exact location, your panel model and roof orientation.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/calculators/penstock-pipe-loss/https://greenenergy.net/calculators/penstock-pipe-loss/Friction loss in a hydro penstock or any water pipe with Darcy–Weisbach and the Colebrook equation: net head, power lost, water-hammer surge and the smallest diameter that keeps losses under your target.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/calculators/power-unit-converter/https://greenenergy.net/calculators/power-unit-converter/Convert power between watts, kilowatts, megawatts, mechanical, metric and boiler horsepower, BTU per hour, tons of refrigeration, kcal/h and ft·lbf/s. Every unit is shown at once, along with the energy delivered per hour, day and year.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/calculators/wind-farm-calculator/https://greenenergy.net/calculators/wind-farm-calculator/A utility-scale project model in one page: turbines, capacity factor or wind speed, capex, opex, PPA price and debt → annual MWh, LCOE, project and equity IRR, DSCR, land area and homes powered.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/calculators/cable-size-voltage-drop/https://greenenergy.net/calculators/cable-size-voltage-drop/Finds the smallest cable that meets both your voltage-drop limit and its current-carrying capacity. Works for DC, single-phase or three-phase, copper or aluminium, in mm² and AWG, with power loss and temperature effects.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/calculators/ev-vs-petrol-car/https://greenenergy.net/calculators/ev-vs-petrol-car/Compares an electric car with a petrol car over the years you keep it: purchase and subsidies, energy, maintenance, insurance, tax and resale value. It adds lifecycle CO₂ (including battery manufacturing and your grid’s carbon intensity) and the break-even mileage for both money and emissions.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/calculators/heating-cost-comparison/https://greenenergy.net/calculators/heating-cost-comparison/Ranks nine heating systems (gas, LPG, oil, electric, air- and ground-source heat pumps, pellets, logs and district heating) by cost per kWh of useful heat, annual bill and CO₂, using your own prices.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/calculators/kva-to-kw/https://greenenergy.net/calculators/kva-to-kw/Convert between apparent power (kVA), real power (kW), reactive power (kVAr) and current for single- and three-phase systems. You also get the power triangle and the capacitor bank needed to correct the power factor.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/calculators/kwh-cost-calculator/https://greenenergy.net/calculators/kwh-cost-calculator/Turn any power rating and running time into kilowatt-hours and money per hour, day, month and year. Optional day/night tariff, plus a quick check of what the same use would cost at other prices.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/calculators/off-grid-solar-calculator/https://greenenergy.net/calculators/off-grid-solar-calculator/Sizes a complete stand-alone solar system from your appliances. It designs for the darkest month at your location using NASA satellite climate data, days of autonomy and real battery chemistry limits.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/calculators/solar-loan-calculator/https://greenenergy.net/calculators/solar-loan-calculator/Finance your solar panels or pay cash? This compares the loan payment with your electricity bill savings month by month, then the net benefit of a loan, a cash purchase and doing nothing over the system's life.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/calculators/solar-tilt-angle/https://greenenergy.net/calculators/solar-tilt-angle/Finds the optimum tilt and orientation by simulating every hour of a real NASA weather year at 30+ panel angles. Includes seasonal angles, roof-pitch losses and an east/west comparison.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/calculators/tidal-energy-calculator/https://greenenergy.net/calculators/tidal-energy-calculator/Estimate the yearly output of a tidal lagoon/barrage from basin area and tidal range, or of tidal stream turbines from current speed and rotor size, simulated through every spring–neap cycle of a year.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/calculators/co2-tree-offset/https://greenenergy.net/calculators/co2-tree-offset/Calculates the trees and hectares needed to absorb a given amount of CO₂ within your chosen time frame, using realistic growth curves for 11 forest types from boreal spruce to tropical eucalyptus.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/calculators/wind-speed-height/https://greenenergy.net/calculators/wind-speed-height/Convert a measured wind speed to any height from 0 to 200 m with both the Hellmann power law and the logarithmic wind profile, and see what the extra height does to available power.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/calculators/battery-bank-size/https://greenenergy.net/calculators/battery-bank-size/Works out how many kWh and amp-hours your battery bank needs (with margins for depth of discharge, temperature, ageing and efficiency) and how to wire your chosen batteries in series and parallel.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/calculators/heat-pump-vs-gas-boiler/https://greenenergy.net/calculators/heat-pump-vs-gas-boiler/Compares an air-source heat pump with a new condensing gas boiler on running cost, installation, maintenance, standing charges and CO₂, and shows the electricity-to-gas price ratio at which they break even.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/calculators/ohms-law-power/https://greenenergy.net/calculators/ohms-law-power/Enter any two of voltage, current, resistance and power to get the other two, plus energy use, running cost and how power changes with voltage across the same load.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/calculators/ppa-price-calculator/https://greenenergy.net/calculators/ppa-price-calculator/Solves the power purchase agreement price that delivers your target equity IRR, or the IRR a given PPA price earns, for solar, wind and hybrid projects with debt, tax, indexation and a merchant tail.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/calculators/solar-roof-area/https://greenenergy.net/calculators/solar-roof-area/Lays out real modules on a pitched, gable or flat roof, with edge and ridge setbacks, obstructions, portrait, landscape or mixed rows and row spacing on flat roofs. You get the panel count, kWp, kWh per year and roof load.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/calculators/wind-power-density/https://greenenergy.net/calculators/wind-power-density/Wind power density is the single best number for comparing wind sites. Enter a mean speed, height and Weibull k to get W/m², the NREL wind power class and how much energy hides in strong winds.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/calculators/gas-cost-calculator/https://greenenergy.net/calculators/gas-cost-calculator/Turns two gas meter readings (m³, ft³, kWh or therms) into kWh using the calorific value and volume correction exactly as suppliers do, then adds unit price, standing charge and VAT. It also estimates your annual gas use from a single bill.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/calculators/gas-unit-converter/https://greenenergy.net/calculators/gas-unit-converter/Converts any amount of natural gas, LNG, propane, butane, biomethane or hydrogen between volume (m³, Nm³, ft³, ccf, Mcf), energy (kWh, MJ, GJ, therm, BTU, MMBtu) and mass or liquid volume, on a gross or net calorific basis.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/calculators/net-metering-calculator/https://greenenergy.net/calculators/net-metering-calculator/See what your solar exports are really worth: month-by-month netting, kWh or money credit rollover, year-end true-up, non-nettable network charges and fixed fees, side by side for every scheme.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/calculators/transport-emissions-calculator/https://greenenergy.net/calculators/transport-emissions-calculator/Compare the CO₂ of one trip by petrol, diesel, hybrid or electric car (on your grid), bus, coach, train, plane, ferry, motorbike or e-bike, per passenger and in total.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/calculators/weibull-wind-distribution/https://greenenergy.net/calculators/weibull-wind-distribution/Describe a wind climate with two numbers. Enter k and c, mean speed and k, or mean and standard deviation to get the probability curve, hours per speed bin, energy pattern factor and operating hours of a turbine.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/calculators/air-conditioner-cost/https://greenenergy.net/calculators/air-conditioner-cost/Sizes an air conditioner for your room (BTU and kW) from floor area, ceiling height, sun exposure, climate and occupants, then calculates the electricity it uses and what it costs per hour, day, month and cooling season from its SEER or EER.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/calculators/solar-inverter-sizing/https://greenenergy.net/calculators/solar-inverter-sizing/Simulates your array hour by hour with NASA weather to show how much energy each inverter size would clip, then recommends the size, the phase and the economic DC/AC ratio.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/calculators/three-phase-power/https://greenenergy.net/calculators/three-phase-power/Calculates three-phase real, reactive and apparent power from current (or current from power), with line and phase voltages and currents for star (Y) and delta (Δ) connections, motor efficiency and a table of standard voltages.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/calculators/fuel-energy-content/https://greenenergy.net/calculators/fuel-energy-content/Energy (lower and higher heating value) and CO₂ for 21 fuels, from diesel, petrol, LPG and natural gas to coal grades, wood, pellets, hydrogen, ethanol, kerosene and uranium. Also works out the true cost per kWh of heat from the price you pay.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/calculators/insulation-savings-calculator/https://greenenergy.net/calculators/insulation-savings-calculator/Enter the area and U-value of walls, roof, windows and floor before and after insulating. Using heating degree days for your climate, it shows the heat loss avoided, kWh and money saved, CO₂ and payback for each measure.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/calculators/solar-string-sizing/https://greenenergy.net/calculators/solar-string-sizing/Checks a PV string against the inverter’s maximum DC voltage, MPPT window, start-up voltage and current limits at your record cold and hottest conditions, using the NEC 690.7 and IEC methods.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/calculators/energy-price-converter/https://greenenergy.net/calculators/energy-price-converter/Convert gas, power, oil and coal prices between the units traders and utilities quote them in (€/MWh, cents per kWh, $/MMBtu, pence per therm, $/GJ and $ per barrel of oil equivalent), using your own exchange rates.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/calculators/solar-water-heater-calculator/https://greenenergy.net/calculators/solar-water-heater-calculator/Sizes a solar hot-water system with the f-chart method used by engineers, fed with NASA satellite climate for your location: monthly solar fraction, savings versus electric, gas or heat pump, and payback.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/calculators/ground-source-heat-pump/https://greenenergy.net/calculators/ground-source-heat-pump/Sizes a ground-source heat pump from your heat demand: kW output, borehole metres or horizontal collector area for your soil or rock (VDI 4640 extraction rates), seasonal COP, running cost and installed cost versus an air-source unit and gas.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/calculators/appliance-energy-cost/https://greenenergy.net/calculators/appliance-energy-cost/Enter the wattage and daily use of any device to see its kWh, running cost per hour, day, month and year, plus the CO₂ it emits on your grid.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/calculators/green-hydrogen-calculator/https://greenenergy.net/calculators/green-hydrogen-calculator/Size an electrolyzer (alkaline, PEM or SOEC) and see how many tonnes of hydrogen it makes, how much water and electricity it uses, and what each kilogram costs, including stack replacements and degradation, with a capacity-factor sensitivity chart.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/calculators/biogas-calculator/https://greenenergy.net/calculators/biogas-calculator/Enter what goes into the digester each day (slurry, manure, silage, beet or food waste) and get biogas and methane volumes, CHP electrical and thermal output (or biomethane), digester size, loading rate and economics.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/calculators/generator-fuel-calculator/https://greenenergy.net/calculators/generator-fuel-calculator/How much diesel, petrol, LPG or natural gas a generator burns at any load, how long a tank lasts and what each kWh really costs once engine wear is counted, compared with grid power and solar plus battery.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/calculators/water-heater-cost/https://greenenergy.net/calculators/water-heater-cost/Works out how much it costs to heat your water each year with six technologies (electric tank, heat-pump water heater, gas tank, gas tankless, electric instant and solar thermal), including standby losses, purchase price and lifetime.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/calculators/fuel-cell-calculator/https://greenenergy.net/calculators/fuel-cell-calculator/How much hydrogen does a fuel cell burn, how long will a tank last and what does each kWh cost? Covers PEM, SOFC, PAFC, MCFC and alkaline cells, part-load efficiency, recoverable heat, water output and a diesel-generator comparison.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/calculators/led-savings-calculator/https://greenenergy.net/calculators/led-savings-calculator/Compare incandescent, halogen or CFL bulbs with LEDs of the same brightness: energy and money saved per year, replacement bulbs avoided, payback time in months, 10-year savings and CO₂. An optional heating-season correction is included.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/calculators/capacity-factor-calculator/https://greenenergy.net/calculators/capacity-factor-calculator/Capacity factor = actual energy ÷ (nameplate capacity × hours). Calculate it from production data, turn a capacity factor into MWh, or size the capacity needed, then compare with typical values for nuclear, wind, solar, hydro and gas.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/calculators/standby-power-calculator/https://greenenergy.net/calculators/standby-power-calculator/Count the devices in your home that never really switch off (TVs, set-top boxes, consoles, routers, smart speakers, chargers) and see their phantom load in watts, kWh, money and CO₂, plus what smart plugs or power strips could save.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/calculators/biomass-boiler-calculator/https://greenenergy.net/calculators/biomass-boiler-calculator/From your annual heat demand to tonnes and cubic metres of logs, chips or pellets (corrected for moisture content), plus boiler size, buffer tank, store volume and the running cost against gas, oil and a heat pump.Thu, 12 Nov 2026 00:00:00 GMThttps://greenenergy.net/calculators/pumped-hydro-storage/https://greenenergy.net/calculators/pumped-hydro-storage/Turns reservoir volume, head and machine efficiencies into MWh stored, round-trip efficiency, hours of discharge, drawdown, arbitrage revenue and levelized cost of storage.Thu, 12 Nov 2026 00:00:00 GMT