Compound Interest Calculator
See how a lump-sum investment grows once interest starts earning interest on itself, at any compounding frequency.
Overview
Compound interest grows faster than simple interest because each period's interest is added to the principal before the next period's interest is calculated. The difference between compounding frequencies (annual vs. monthly vs. daily) is usually small in absolute terms but grows with a higher rate or a longer duration — this calculator makes that difference visible instantly instead of requiring the formula to be worked out by hand.
Examples
10,000 at 6% compounded monthly for 5 years
Principal: 10000, Rate: 6, Compounded: Monthly, Years: 5
Final Amount: 13488.50 Interest Earned: 3488.50
How It Works
- Enter your principal amount and annual interest rate.
- Choose how often interest compounds — annually, semi-annually, quarterly, monthly, or daily.
- Enter the number of years, and the final amount and total interest earned appear instantly.
FAQ
No. All calculation happens locally in your browser.
How often interest is calculated and added to the principal each year — annually, semi-annually, quarterly, monthly, or daily. More frequent compounding yields slightly more growth for the same nominal rate.
A = P × (1 + r/n)^(n×t), where P is principal, r is the annual rate, n is the compounding frequency per year, and t is the number of years.
No. This calculator assumes a single upfront principal with no further deposits or withdrawals during the term.