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No account, no upload, no queue. Sensitive figures such as salary, debt and home price never leave your device, and the page keeps working offline once loaded.
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Free calculators that run entirely in your browser
Danfio builds focused tools for the money and file problems people hit every week: mortgage and loan payments, debt payoff plans, mortgage affordability, pay and tax estimates, then file, text and developer utilities. Each page explains the maths it uses, so you can check the answer instead of trusting a black box.
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Every calculator documents the formula and the assumptions behind it, with worked examples generated by the same engine that powers the tool.
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Calculators, downloaded schedules and copy-ready results are free. The site is funded by display advertising, never by selling your data.
Loans & Mortgages
Payments, amortization, refinancing and what you can afford.
Amortization Schedule CalculatorGenerate a full amortization schedule for any loan: every payment split into interest and principal, with yearly totals and a CSV export.Open calculator →APR CalculatorTurn a loan offer into its APR: add origination fees and points to see the real annual percentage rate beside the advertised interest rate.Open calculator →Auto Loan CalculatorCalculate your car payment from the vehicle price, trade-in, sales tax, fees and APR. See total interest, the payoff date and the full schedule.Open calculator →Home Affordability CalculatorFind the maximum home price that fits your income, debts and down payment using the 28/36 debt-to-income rules, including tax, insurance and HOA.Open calculator →Loan CalculatorWork out the monthly payment, total interest and full amortization schedule for any fixed-rate loan. Free, instant and computed in your browser.Open calculator →Mortgage CalculatorFree mortgage calculator with property tax, insurance, HOA and PMI. See your monthly payment, total interest and a full amortization schedule instantly.Open calculator →Mortgage Payoff CalculatorSee how much time and interest extra payments save on a mortgage or loan. Enter an extra monthly or annual amount and get the new payoff date instantly.Open calculator →Refinance CalculatorCompare your current loan with a refinance offer: new payment, monthly saving, break-even point on closing costs and lifetime interest saved.Open calculator →
Debt & Credit
Payoff plans, interest cost and credit card minimums.
Credit Card Payoff CalculatorSee how long a credit card balance takes to clear on minimum payments, and how much interest and time a fixed extra payment saves you.Open calculator →Debt Payoff CalculatorCompare the debt snowball and avalanche methods on your real balances. See your debt-free date, total interest and the order each debt gets cleared.Open calculator →