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We read every message. Corrections to data or formulas are our top priority.

Useful to include

For a calculation question: the share link of your calculation (Share button, then copy link), so we can see exactly what you entered.
For a data correction: the page, the value you believe is wrong, and a source.
For embedding or partnerships: your website and how you plan to use our tools.

We do not provide personal financial or engineering advice, and we do not sell or install equipment.