Calculators

15 free personal-finance calculators in three categories. All math runs in your browser. No accounts.

FIRE Family

When can you stop working?

Four flavors of financial independence — same compounding math, different lifestyle bets.

4 calculators →
Income & Wealth

What you make. What you keep.

Earn, save, sell — the side of the balance sheet that tracks how much money flows toward you.

6 calculators →
Debt & Costs

What things actually cost.

Money flowing out — over the full term, not the sticker. Loans, recurring obligations, big purchases.

5 calculators →

Or scan the full list of 15 calculators on a single page.