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, with no sign-up, no newsletter and 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 and 2026 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 calculators people use most right now, based on real visitor numbers. A fast starting point if you are not sure where to begin.
Gas Mileage Calculator
Calculate your MPG and fuel cost per trip
Fuel Cost Calculator
Estimate the fuel cost of a trip
Life Expectancy Calculator
Estimate remaining years of life from the SSA actuarial life table
Tax Refund Calculator
Estimate your federal tax refund for 2025 or 2026
Income Tax Calculator
Estimate your 2026 or 2025 federal income tax with current IRS brackets
Paycheck Calculator
Calculate your take-home pay after federal tax and FICA
Closing Cost Calculator
Estimate closing costs for buying or refinancing a home
Compound Interest Calculator
See how your money grows with compound interest over time
Fraction Calculator
Add, subtract, multiply and divide fractions
Date Calculator
Add or subtract days and find the duration between dates
Hours Calculator
Calculate hours worked between two times
Rounding Calculator
Round numbers to any decimal place
Mortgage & Home
30 calculatorsLoans & Debt
22 calculatorsSavings & Interest
15 calculatorsInvesting & Retirement
45 calculatorsTaxes & Income
37 calculatorsHealth & Fitness
47 calculatorsHome & Construction
45 calculatorsMath & Conversion
123 calculatorsEveryday & Time
47 calculatorsBusiness & Work
34 calculatorsCalendars and holidays
Printable calendars with federal holidays, observed dates and the rules behind movable holidays like Easter and Mardi Gras.
2026 Calendar
Printable 2026 calendar with federal holidays and week numbers
2027 Calendar
Printable 2027 calendar with federal holidays and week numbers
Federal Holidays 2026
All 11 federal holidays with observed dates and long weekends
Federal Holidays 2027
All 11 federal holidays with observed dates and long weekends
Easter 2027
Easter Sunday 2027, how the date is set and a 10-year table
Mother's Day 2027
Mother's Day 2027 date and the rule behind it
Mardi Gras 2027
Mardi Gras 2027 date, Ash Wednesday and the Easter link
How 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 free: no sign-up, no login, no premium tier. The site is supported by ads, which never affect your results.
Are my inputs stored anywhere?
No. Every calculation runs directly in your browser with JavaScript, so the numbers you enter are not sent to a server and not saved in a database. Page views are counted with Vercel Web Analytics, which uses no cookies, and with Google Analytics, which uses cookies; neither receives the numbers you enter. Ads come from Google AdSense, which uses cookies as described in the privacy policy.
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?
Paycheck, withholding and take-home tools use tax year 2026: the brackets and standard deduction published by the IRS and the Social Security wage base published by the Social Security Administration. The income tax, tax refund, tax bracket and effective tax rate calculators let you choose the tax year (2026 or 2025), so you can also check the return for an earlier year. We update figures as the IRS releases new ones.