Numbers you can understand.

What we do

Whether you're comparing mortgage payments, checking a paycheck, planning a project or converting a recipe, Calculyn aims to give you a clear answer in seconds — and explain how it was reached. We currently offer 87 calculators, and we add more as we're confident they're accurate and useful.

How we build calculators

• Transparent formulas. Every calculator shows the formula it uses, a worked example and its key assumptions.
• Deterministic math. Results are calculated directly in your browser with standard formulas — never guessed or generated by AI.
• Dated where it matters. Tax and other time-sensitive calculators show the year their figures apply to.
• Free to use. No account or email is needed to use any calculator.

What Calculyn isn't

Our results are estimates for general information. They aren't financial, tax, legal or medical advice, and they can't account for every detail of your situation. For important decisions, we encourage you to confirm with a qualified professional.

Explore

• Money calculators — 30 tools. Clear numbers for big decisions.
• Home calculators — 8 tools. Measure twice, buy once.
• Health calculators — 15 tools. Know your body's numbers.
• Math calculators — 15 tools. The clever shortcuts.
• Everyday calculators — 13 tools. Little answers, all day long.
• Conversions calculators — 6 tools. Any unit, instantly.

Spotted a problem or have an idea? Get in touch.