Free finance calculators that run in your browser
Private finance calculators for mortgages, auto loans, credit-card payoff, savings, retirement, investing, inflation, salary and crypto — 100% in your browser with no uploads, accounts or live-rate APIs.
Mortgage Calculator
Estimate a mortgage payment with taxes, insurance and a full amortization schedule.
Auto Loan Calculator
Work out a car payment from price, down payment, trade-in, tax, rate and term.
Credit Card Payoff Calculator
See months to clear a card and total interest, or the payment to hit a target date.
Savings Goal Calculator
Find how long a savings goal takes, or the monthly amount needed to reach it on time.
Retirement Calculator
Project a retirement nest egg from your age, savings, contributions and return rate.
Investment Calculator
Model investment growth with contributions and a year-by-year balance table.
ROI Calculator
Calculate return on investment and annualized return from initial and final values.
Inflation Calculator
Estimate future or past buying power from an amount, rate and number of years.
Salary Converter
Convert pay between hourly, weekly, monthly and annual using your own schedule.
Crypto Profit Calculator
Calculate crypto profit or loss and percent return from buy, sell, quantity and fees.
Debt Snowball vs Avalanche Calculator
Compare snowball and avalanche payoff plans: debt-free date, total interest and a monthly table.
FIRE Calculator
Find your FIRE number and years to financial independence, with Lean, Fat and Coast FIRE targets.
Rent vs Buy Calculator
Compare renting and buying a home: net worth over time, monthly costs and the break-even year.
Break-Even Calculator
Calculate break-even units and revenue, contribution margin and margin of safety for your product.
Private money math, right in your browser
Every calculator on Finance Tools runs entirely on your device using JavaScript. Your numbers are never uploaded to a server, so planning is instant and completely private. There's no signup, no account and no live-rate lookup — you stay in control of every assumption.
Planning a home loan with the mortgage calculator, clearing a card with the credit card payoff calculator, growing money with the investment calculator or sizing a retirement nest egg? Pick a tool above and the results update live as you type.
These tools are educational estimates, not financial advice. They use the rates and assumptions you enter, so always confirm final figures with your lender, broker or a qualified advisor before making decisions.