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Found a bug? Spotted a number that looks off? Wish a calculator existed that doesn't yet? We read every message.

Email us at [email protected] and we'll get back to you as soon as we can.

What to include

For bug reports, the tool name and the exact inputs you used help us reproduce the issue quickly. For tool suggestions, a sentence about what you were trying to figure out is plenty — the best tools on this site started as visitor requests.