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Free Online Calculators

44 fast, accurate and private calculators for finance, health, math and everyday life. No sign-up and nothing to download.

Popular: Mortgage CalculatorLoan CalculatorCompound Interest CalculatorBMI CalculatorPercentage CalculatorSalary CalculatorUnit Converter
  • Your numbers stay in your browser: nothing is uploaded
  • Every calculator explains the formula and gives worked examples
  • Works on phone, tablet and desktop, in light or dark mode
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Financial Calculators

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Health & Fitness Calculators

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Math Calculators

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Everyday Tools

View all 44 calculators ›

Latest guides

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How to Calculate Your Monthly Mortgage Payment (With Examples)

Learn the mortgage payment formula, what PITI means, and how rate and term change what you pay each month, with clear worked examples.

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How Compound Interest Works and Why Starting Early Matters

Understand compound interest with simple examples, the Rule of 72, and practical tips to make your savings grow faster over time.

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How to Calculate Percentages: Formulas, Examples and Common Mistakes

A complete guide to percentages: percent of a number, percentage change, increase and decrease, with step-by-step examples you can follow.

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How to Create a Strong Password You Can Actually Use

What makes a password strong, how long it should be, why reuse is dangerous, and how password managers and two-factor authentication keep you safe.

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BMI Explained: How to Calculate It and What the Result Really Means

How body mass index is calculated, the standard adult categories, its limits, and healthier ways to think about weight and health.

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How to Pay Off Credit Card Debt Faster: Strategies That Work

See how minimum payments keep you in debt, compare the avalanche and snowball methods, and learn steps to clear your balance and save on interest.

All guides ›

About Free Finance Simulator

Free Finance Simulator brings together 44 free calculators and tools in one place. Plan a loan or mortgage, see how compound interest grows your savings, plan your retirement, check your BMI, solve a quadratic equation or convert units, all in seconds and without creating an account.

Every calculator explains how it works, shows the formula behind the result and answers common questions, so you understand the numbers instead of just trusting them. The tools run in your browser: the values you type are not uploaded to our servers.

Results are estimates for information only. For financial, medical or legal decisions, please consult a qualified professional. Missing a tool? Tell us and we will consider adding it.