Know your numbers before you sign anything
32 free calculators for mortgages, retirement, loans, and taxes — with real amortization schedules and charts, not just a single number.
Popular calculators
View all 32 →Mortgage CalculatorMonthly payment, PITI, and full amortization schedule.House Affordability CalculatorHow much home you can afford based on income and debts.401(k) CalculatorContributions, employer match, and growth over time.Retirement CalculatorWill your savings last through retirement?Loan CalculatorMonthly payment and total cost for any fixed-rate loan.Auto Loan CalculatorCar payment with trade-in, sales tax, fees, and rebates.Compound Interest CalculatorHow savings grow with regular contributions.Paycheck CalculatorTake-home pay after federal, state, and FICA taxes.
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Why use Math of Money
Built for people making a real decision, not just curious about a number.
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Real charts
Balance over time, payment breakdowns, and year-by-year comparisons.
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Full amortization schedules
Every payment for the life of the loan, monthly or yearly.
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PDF reports
A clean, printable report of your inputs, results, and schedule.
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Scenario comparison
Line up 2–3 versions of a calculation side by side.
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Share links
Send a read-only link to your results — no account needed.
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Latest guides
All guides →Numbers you can trust
Transparent methodology
Every calculator's formulas are published — see exactly how we get from your inputs to the result.
Sourced data
Tax brackets, contribution limits, and rate assumptions are pulled from the IRS, SSA, and Treasury and dated on every page.
Tested before it ships
Every calculation is checked against hand-verified reference values, including zero-rate and edge cases, before it goes live.