Compound Interest Calculator
See how your investments grow over time with the power of compound interest.
Calculator Inputs
Final Balance
$345,742
Total Contributions
$130,000
Total Interest Earned
$215,742
166% return on contributions
Growth Over Time
The Power of Compound Interest
Compound interest is interest earned on both your original investment and on previously earned interest. Albert Einstein allegedly called it “the eighth wonder of the world.” The key insight: time in the market matters more than timing the market. Starting early — even with small amounts — can lead to dramatically larger results than starting later with bigger contributions.
Rule of 72
Divide 72 by your annual return rate to estimate how many years it takes to double your money. At 8% return, your money doubles roughly every 9 years.
Take the Next Step
Now that you have the numbers, here are some ways to act on them.
Open a Brokerage Account
Start investing with as little as $1. Many brokerages offer free stock for new accounts.
Compare Brokerages→High-Yield Savings Accounts
Earn 4-5% APY on your savings. No risk, FDIC insured.
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