Compound Interest Calculator

Calculate how your money grows over time with compound interest and regular contributions.

Advertisement 728×90 — Leaderboard
Home › Investing › Compound Interest

Calculate now

$
$
%
Final balance
—
—
Total Contributions
—
Interest Earned
—
Interest % of Total
—
Rule of 72
—

How compound interest works

Compound interest means you earn interest on both your principal and on previously earned interest. The longer your money compounds, the more dramatic the effect. Starting early is far more valuable than investing a larger amount later.

FV = PV × (1+r)^n + PMT × [(1+r)^n − 1] / r
FV = future value · PV = initial · PMT = contribution · r = monthly rate
What is compound interest?
Compound interest means earning interest on your interest. Over time, this creates exponential growth — Albert Einstein reportedly called it the eighth wonder of the world.
What is the Rule of 72?
Divide 72 by your annual interest rate to estimate how many years it takes to double your money. At 7%: 72÷7 ≈ 10.3 years.
Advertisement 300×250 — Rectangle

More calculators

Advertisement 300×600 — Half Page
Advertisement 728×90 — Leaderboard