About Calculators Percentage
Calculators Percentage is a free library of online calculators for money, health, math and everyday decisions.
Our mission
Everyday decisions – a loan, a savings goal, a diet plan, a tax estimate – often depend on a formula most people never see. We make those formulas open, fast and easy to use on any phone, and we explain every result in plain language so you understand the number, not just read it.
What makes our calculators different
- Transparent formulas: every page shows the exact formula it uses and a worked example you can check by hand.
- Official references: financial, tax and health pages link to the government or standards bodies behind the rules (IRS, SSA, CFPB, CDC, WHO, NIST and others).
- Tested results: calculations are checked by automated tests against known answers before any change goes live. See our methodology.
- Private by design: the numbers you enter are calculated in your browser and are not sent to us. See our privacy policy.
- Free, no sign-up: every calculator is free to use without an account.
What we cover
- Savings & Banking – HYSA, CDs, APY & emergency funds
- Debt, Mortgage & Refinance – Refinance, payoff & balance transfers
- Retirement, Tax & Wealth – 401(k), IRA, RMD, FIRE & taxes
- Senior Healthcare & Insurance – Medicare, SSDI, life & care costs
- Injury & Claim Settlements – Accident, workers' comp & lemon law
- Loans & Everyday Finance – Loans, interest, savings & business
- Math Calculators – Percentages, algebra, geometry & stats
- Fitness & Health Calculators – BMI, calories, body fat & pregnancy
- Other Calculators – Dates, units & everyday tools
Important note
Our calculators give educational estimates. They are not financial, tax, legal or medical advice. For decisions with real consequences, confirm results with a qualified professional. Read our terms of use.