๐บ๐ธ US Calculator
Free online calculators for the United States - fast, accurate & free
Free calculators for the things Americans actually need to figure out
US Calculator brings together free, no-nonsense calculators for the money and everyday math questions that come up most often in the United States: your monthly mortgage payment, the real cost of a car loan, your take-home paycheck after federal tax and FICA, how fast a credit card gets paid off, your BMI, or how many cubic yards of concrete a project needs. Every calculator gives you an answer in seconds - no sign-up, no newsletter, no paywall.
Everything runs in your browser. Your numbers never leave your device. Financial-math calculators use exact standard formulas, and our tax and benefit tools use figures published by the IRS and the Social Security Administration for the current year.
Accurate & current
Standard financial formulas plus 2025 IRS & SSA figures. Updated when official numbers change.
Private by design
Every calculation runs locally in your browser. Your inputs are never sent to a server or stored.
Always free
No account, no fees, no limits. Ad-supported so the calculators stay free for everyone.
Most popular calculators
The tools people reach for most - a fast starting point if you are not sure where to begin.
Mortgage Calculator
Estimate your monthly mortgage payment with taxes, insurance & PMI
Loan Calculator
Calculate monthly payments, total interest and payoff for any loan
Auto Loan Calculator
Estimate your car loan payment with trade-in, tax and down payment
Income Tax Calculator
Estimate your federal income tax for the 2025 tax year
Paycheck Calculator
Calculate your take-home pay after federal tax and FICA
Compound Interest Calculator
See how your money grows with compound interest over time
Mortgage & Home
22 calculatorsLoans & Debt
19 calculatorsSavings & Interest
12 calculatorsInvesting & Retirement
24 calculatorsTaxes & Income
16 calculatorsHealth & Fitness
23 calculatorsHome & Construction
24 calculatorsMath & Conversion
45 calculatorsEveryday & Time
16 calculatorsBusiness & Work
16 calculatorsHow we calculate
Every calculator is built on a documented formula or an official published figure - we do not invent rules of thumb. When a number appears on this site, it traces back to a standard financial formula or a primary source. The main sources by area:
- Taxes & paychecks: Internal Revenue Service (federal brackets, standard deduction, withholding) and the Social Security Administration (Social Security & Medicare / FICA rates and wage base).
- Mortgage, loans & debt: standard amortization math; consumer guidance from the Consumer Financial Protection Bureau (CFPB).
- Retirement & investing: IRS contribution limits (401(k), IRA), SSA benefit rules, and standard time-value-of-money formulas.
- Health & fitness: WHO BMI classification, NIH/NIDDK guidance, and the Mifflin-St Jeor equation for metabolic rate.
- Construction: standard geometric volume and area formulas.
Frequently asked questions
Are these calculators really free?
Yes. Every calculator on US Calculator is 100% free - no sign-up, no login, no premium tier. The site is supported by ads that never affect your results.
Are my inputs stored anywhere?
No. Every calculation runs directly in your browser with JavaScript - nothing is sent to a server and nothing is saved in a database. We use privacy-friendly Vercel Web Analytics, which does not collect personal data.
How accurate are the results?
Financial-math calculators (mortgage, loan, compound interest, amortization) use exact standard formulas. Tax and benefit calculators use published IRS and SSA figures for the current year. Results are estimates and not professional financial, tax, medical, or legal advice.
Which year do the tax calculators use?
Tax calculators use the 2025 federal tax year (returns filed in 2026): the 2025 brackets, standard deduction, and FICA rates published by the IRS and Social Security Administration. We update figures as the IRS releases new ones.