Compound Interest Calculator
Enter your principal, annual rate, compounding frequency, and time horizon to see exactly how your money grows.
100% client-side · no upload
Future Value
$19,672
Total Interest Earned
$9,672
Growth
96.7%
How to use the compound interest calculator
- Enter your starting principal — the amount you invest today.
- Set the annual interest rate and choose how often interest compounds.
- Enter the number of years to see your future balance and total interest earned.
Common use cases
- Long-term investing: Monthly compounding at 7% turns $10,000 into nearly $20,000 in 10 years.
- Savings accounts: Compare daily vs. monthly compounding to see the real difference.
- Retirement planning: Model how starting earlier dramatically increases final wealth.
Related tools: Retirement Planner · Investment Return Calculator · 401(k) Projection · All Finance Tools
よくある質問
- Is this compound interest calculator free?
- Yes, completely free with no signup required. All calculations run in your browser.
- Does my data leave my device?
- No. The calculator runs entirely in your browser. Your numbers are never sent to any server.
- Does it work on mobile?
- Yes. The tool is mobile-first and works on iPhone Safari and Android Chrome without any app install.