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Questions, corrections, feedback or partnership ideas — all of it reaches the same inbox, and a person reads it.
What people usually write about
A result looks wrong
The most useful message we get. Name the calculator and the exact inputs — we can usually reproduce it in minutes and fix the formula the same day.
A calculator is missing
Requests decide what gets built next. Tell us what you were trying to work out and where you gave up.
Partnerships and press
We are open to content partnerships and data verification work that genuinely helps readers. Anything that would mislead them, we decline.