Free personal finance calculators

Calculators

• Compound Interest Calculator

  See how a starting balance and monthly contributions grow over time, with a year-by-year split between what you put in and what you earned.

• Savings Goal Calculator

  Find out how much to save each month to reach a target amount by a deadline, given what you have saved so far and the rate you expect to earn.

• FIRE Calculator

  Find your FIRE number from your annual spending and withdrawal rate, and see how many years of saving and growth it takes to reach it.

• Investment Fee Calculator

  Compare your ending balance with and without an annual fund or advisory fee, and see how much the fee costs you over time.

• CAGR Calculator

  Turn a starting value, an ending value and a number of years into a compound annual growth rate, with total return, gain and growth multiple.

Worked examples

• Compound interest examples

  Worked examples for specific amounts and time spans, each shown at rates from 1% to 12% with a year-by-year breakdown.

How these calculators work

• Runs in your browser

  The math happens on your device. There is no account to create and nothing to install.

• Formulas shown

  Every calculator explains how its result is worked out, so you can check the numbers yourself.

• Tested calculations

  The math behind each calculator is covered by automated tests against known formula results.

• Estimates, not advice

  Results assume a constant rate and leave out fees, taxes and inflation unless a page says otherwise.

Read the methodology for the exact formulas and assumptions, or about this site.