Skip to content
FinCalc

FinCalc

Clear, honest financial calculators

25 free calculators for the money decisions that actually matter — renting vs. buying, paying off debt, retiring early, quarterly taxes, and more. Pre-filled, private, and genuinely useful.

Popular calculators

View all →

Real answers instantly

Every calculator loads pre-filled with sensible example numbers, so you see a meaningful result the moment the page opens.

Private by design

Everything runs in your browser. Saved scenarios stay on your device — no account, no sign-up, nothing sent to a server.

Shareable & comparable

Copy a link to any result, or compare scenarios side by side to see how the numbers change.

Make your next money decision with confidence

Free, private, and built to give you a real answer — not a sales pitch.

Explore all 25 calculators