Compound Interest Calculator

See how your savings grow with compound interest. Add monthly contributions and pick your compounding frequency to model a real high-yield savings account.

Total contributed
$40,000
Interest earned
$13,469
Final balance
$53,469

The compound interest formula

A = P(1 + r/n)^(nt)

P = principal, r = annual rate (decimal), n = compounds per year, t = years. With monthly contributions, future value of the contribution stream is added each period.

Worked example

Start with $10,000 at 4.5% APY, add $250/month, compounded monthly for 10 years. Final balance ≈ $53,469. See live high-yield savings rates to put it to work.

Frequently asked questions

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