6 calculators

United States financial calculators

All free, all running in your browser, all showing their working. Pick by name, or search for the problem you are trying to solve.

Pay

What actually lands in your account after deductions.

Paycheck Calculator

See exactly what lands in your account after federal income tax, Social Security, Medicare and your state's income tax, with every bracket shown.

What a mortgage really costs over its whole life.

Mortgage Calculator

Monthly payment, total interest and a full amortization schedule, plus taxes, insurance and PMI, so the number matches your real closing costs.

The true price of financing a vehicle.

Auto Loan Calculator

Monthly payment, total interest and how much of the sticker price turns into interest, including sales tax, trade-in and negative equity.

How long the balance takes to clear, and what it costs you.

Credit Card Payoff Calculator

How long your balance takes to clear and what the interest costs, comparing minimum payments against a fixed amount month by month.

What your money becomes if you leave it alone.

Compound Interest Calculator

What a starting balance plus regular contributions becomes over time, with the year-by-year table and how much of the total is growth.

401(k) and IRA Contribution Calculator

How much you can contribute this year, what the employer match is worth, the tax you save now and what the balance grows to.

Built on 2026 tax rules, last reviewed August 1, 2026. See the official rates behind them.