Compound Interest Calculator
See how your money grows with compound interest. The compound interest calculator takes your principal, annual rate, time horizon, and compounding frequency and shows the final amount, total interest earned, and the growth multiplier compared to your starting principal.
Final Amount
$0
$0
Interest Earned
0x
Growth Multiplier
Advertisement
How to Use the Compound Interest Calculator
- Enter your principal amount — the starting sum.
- Add the annual interest rate you expect to earn.
- Set the time period in years.
- Choose the compounding frequency (more frequent compounds grow slightly faster).
- Click Calculate to see the final amount, interest earned, and growth multiplier.
Formula Used
- A
- — final amount
- P
- — principal
- r
- — annual interest rate (decimal)
- n
- — compounding periods per year
- t
- — time in years
Example: $10,000 at 7% compounded monthly for 10 years grows to about $20,096 — a 2x multiplier.
Frequently asked questions
Everything you need to know about this calculator.
Related Calculators
Simple Interest Calculator
Free simple interest calculator. Quickly find interest and total amount using SI = (P x R x T)/100 for loans, deposits, and short-term finance in seconds.
OpenSavings Calculator
Free savings calculator. Enter initial deposit, monthly contribution, interest rate, and years to project your future balance, total deposits, and interest earned.
OpenInvestment Calculator
Free investment calculator. Enter initial amount, annual return, period, and optional monthly additions to see future value, total invested, returns, and CAGR.
OpenROI Calculator
Free ROI calculator. Enter net profit and cost of investment to compute your return on investment percentage, return ratio, and profit per dollar invested.
Open