Compound Interest Calculator
See how your investment or savings grow with compound interest over time.
Final amount
11,614.72
How It Works
- 1Enter the principal, rate and time period.
- 2Choose a compounding frequency.
- 3View the final amount and interest earned.
Features
- Daily, monthly, quarterly, semi-annual and annual compounding
- Shows total interest earned
Privacy
All calculations happen instantly in your browser. Nothing you enter is ever sent anywhere.
About Compound Interest Calculator
The formula is A = P(1 + r/n)^(nt), where P is the principal, r is the annual interest rate as a decimal, n is the number of compounding periods per year, and t is time in years; interest earned is simply A minus P. Compounding more frequently — daily instead of annually, for example — produces a slightly higher return for the same nominal rate, because interest gets added to the balance sooner and starts earning its own interest sooner.
This is the calculation behind projecting how savings or an investment grows over time, comparing accounts that compound at different frequencies, and understanding how balances like credit card debt can grow faster than expected once interest compounds on unpaid interest.
The projection assumes a constant rate for the whole period and no additional deposits or withdrawals along the way. Real investments fluctuate, and many savings products carry variable or tiered rates, so treat the output as a projection based on a fixed assumption rather than a guaranteed outcome.