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The most trusted free financial calculators for the US & UK. Mortgage, tax, retirement, loans, and more — with real-time results and expert accuracy.
78+ free calculators across 12 verticals, covering both US and UK financial systems. Each one built with real-time results and expert-verified accuracy.
Affordability, FHA, VA, refinance, amortization
Federal, state, self-employment, capital gains
401(k), IRA, FIRE, compound interest, net worth
Student loans, credit cards, debt snowball
Take-home pay, gig earnings, job offers
50/30/20, emergency fund, savings goals
Calclypso isn't another calculator site with bad UX and intrusive pop-ups. It's what financial tools should have always been.
See numbers update instantly as you type. No submit buttons, no waiting.
Every calculation has a unique URL. Share with your partner or advisor.
Test different options side-by-side. 30-year vs 15-year? See both.
Every formula reviewed by credentialed financial professionals.
PAYE, stamp duty, pension, ISA, inheritance tax, salary sacrifice, and more. Covering England, Scotland, Wales, and Northern Ireland with region-specific rules.
Explore UK CalculatorsNo signup, no fees, no personal data collection. Just the best free financial calculators on the internet.
Try the Mortgage Calculator