Financial decisions deserve better tools.

Most online calculators give you a single number and hide everything underneath it. We think that is backwards. When you are deciding whether to refinance, how much to save, or which loan term to choose, the breakdown matters as much as the bottom line.

That is why every tool in our library of 238 calculators shows its work: the full amortization schedule, the split between principal and interest, the year-by-year growth of your savings. You can see exactly how the answer was reached and adjust any input to compare scenarios instantly.

The math we use

Our engine implements the standard time-value-of-money formulas — PMT, FV, PV and full amortization — using the same Excel-compatible conventions that lenders, accountants and financial planners rely on, and it's backed by an automated test suite. You can read exactly how we calculate in our methodology, and how we research and review content in our editorial policy.

How we stay free

FinCalculators is supported by light, non-intrusive advertising and the occasional relevant partner. We never put calculators behind a paywall, never require an account, and never sell your inputs — your numbers stay in your browser.

A calculator should make you smarter about your money, not just hand you a figure to trust on faith.

Have a calculator you would like us to add or improve? Get in touch — we read every message.