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Have a suggestion for a new calculator? Found a bug? Have a question about how one of our tools works? We'd love to hear from you.

What to Include

• Calculator suggestions — Tell us what you'd like to calculate and why it would be useful.
• Bug reports — Let us know which calculator, what inputs you used, and what result you expected vs. what you got.
• General questions — Anything else — we'll do our best to respond within 48 hours.