9+ free US calculators
Answers you can actually trust, in seconds.
Search by name or topic — mortgage, taxes, salary, retirement and everyday math — every formula shown, every assumption clear.
Popular calculators
Age Calculator
Exact age in years, months and days between two dates.
View calculatorUnit Converter
Convert between common length, weight and temperature units.
View calculatorTip Calculator
Tip amount, total bill, and per-person split.
View calculatorPercentage Calculator
What is X% of Y, what percent X is of Y, or percent change.
View calculatorCalorie & TDEE Calculator
Estimated daily calorie needs (BMR and TDEE) based on activity level.
View calculatorBMI Calculator
Body Mass Index and weight category from height and weight.
View calculatorDebt-to-Income Ratio Calculator
Your monthly debt payments as a percentage of your gross monthly income.
View calculatorDebt Payoff Calculator
How long it takes to pay off a balance at a fixed monthly payment.
View calculatorPaycheck Calculator
Estimated take-home pay per paycheck after federal tax and FICA.
View calculatorMortgage Calculator
Monthly Payment
$2,102.17
- Loan amount
- $320,000
- Down payment
- $80,000
- Total interest
- $436,782
- Total payment
- $756,782
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Trusted by thousands of Americans
My US Calculator provides free, accurate calculators for everyday financial and life decisions. Each calculator shows its formula, its assumptions and a worked example — not just a final number.
Frequently asked questions
Are these calculators accurate?
Yes. Every calculator uses the documented formula for that calculation, with assumptions shown clearly on the page — nothing is a black box.
Do I need an account to use them?
No. Every calculator is free to use with no sign-up required.
Are my calculation inputs stored?
No. Calculations run in your browser, and we don't store your financial inputs unless a feature explicitly requires it.