Compound Interest Calculator
Investment growth with compounding
Use this when you need a fast, accurate result — no sign-up, works entirely in your browser.
Final balance—
Interest earned—
How to Use
- Enter your details into the fields above.
- Click the calculate button to get your result instantly.
- Use the clear button to start a new calculation.
Example
- $10,000 at 6% compounded monthly for 10 years → ≈ $18,193.97 final balance; ≈ $8,193.97 interest
- $15,000, 5.5%, compounded quarterly, 8 years → Final ≈ $23,220.90 (interest ≈ $8,220.90)
Formula
A = P × (1 + r/n)n×t, where P = principal, r = annual rate, n = compounds per year, t = years. Interest earned = A − P. Compounding more often raises the result: monthly beats annual, daily beats monthly.
About Compound Interest Calculator
Investment growth with compounding. This free online tool gives you fast, accurate results without registration or downloads.
Everything runs locally in your browser, so your data is never uploaded or stored — privacy first.
Frequently Asked Questions
How does compounding frequency affect growth? +
The more frequently interest compounds (daily vs monthly vs yearly), the faster your balance grows because interest earns interest.
What is the compound interest formula? +
A = P(1 + r/n)^(nt), where P is principal, r is annual rate, n is compounds per year, and t is years.
Is the Compound Interest Calculator free to use? +
Yes, the Compound Interest Calculator is completely free with no registration, login, or download required.
Is my financial data private? +
Yes. All calculations happen locally in your browser. Your numbers are never uploaded or stored on our servers.
Can I use the Compound Interest Calculator on mobile? +
Yes, it works on any device — phone, tablet, or desktop — with instant results.