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Mortgage Calculator
Estimate your monthly payment, interest and full amortization.
Compound Interest Calculator
See how your money grows with compound interest over time.
Auto Loan Calculator
Plan your car payment with price, trade-in and loan terms.
Mortgage Payoff Calculator
How long until your mortgage is paid off — and what an extra payment does.
Refinance Calculator
Compare your current loan against a new rate and term.
Home Affordability Calculator
How much house can you afford based on your income and debts?
Loan Payment Calculator
Estimate the monthly payment and total interest for any amortizing loan.
Credit Card Payoff Calculator
How long it takes to clear your card balance — and what minimums really cost.
Debt Payoff Plan Calculator
Snowball vs avalanche: the fastest way to clear your debts.
Savings Goal Calculator
How much to save each month to hit your goal.
Dividend Calculator
How much a stock pays you in dividends each year.
401(k) Match Calculator
How free employer money boosts your retirement savings.
Retirement Withdrawal Calculator
How long your savings last in retirement.
Federal Income Tax Calculator
Estimate your federal tax and take-home pay.
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Mortgage Calculator
Estimate your monthly payment, total interest and amortization — live, right here.
Based on a $400,000 home, 20% down, at a 30-year fixed rate.
View CalculatorMortgage Calculator
Monthly payment
$1,970/month
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Built using documented formulas and verified against published reference scenarios.
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Every formula, assumption and test case is published on each calculator page.
Financial guides
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Trusted by the math, not by claims
The engineering behind every calculator on this site.
Documented formulas
Every calculator publishes its exact formula and what each variable means.
Reference-tested
Outputs are cross-checked against published reference cases before launch.
Edge-case hardened
Zero, negative and extreme inputs are validated with automated unit tests.
Continuously verified
Each update re-runs the full test suite so results never silently drift.
Frequently asked questions
Are your calculators free?+
No account, no sign-up, no credit card. Every tool is 100% free.
How accurate are the results?+
Built using documented formulas and verified against published reference scenarios.
Do you store any of my data?+
We don't require your financial information. Calculations run entirely in your browser.