Contact

Questions, corrections, feedback, or a calculator you wish existed? I'd love to hear from you.

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I'm a small, independent site, so it's usually me replying personally — typically within 2–3 business days.

• Spotted a mistake in a calculation? Tell me which calculator and what you expected — accuracy matters and I'll fix it fast.
• Want a new calculator? Suggest it; popular requests get built first.
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