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Report a 1% problem

Found some everyday math we don’t solve yet? Or a result that looks wrong? Tell us. Every calculator on this site started as somebody’s “there must be a calculator for this.”

One line is plenty. For example: “How much wallpaper do I need?”
Example numbers, where you got stuck, or a link to a calculator we got wrong.
Only if you’d like a reply. We won’t add you to anything.

This opens your email app with the message filled in, addressed to hello@99solved.com.