Compound Interest Calculator
Future Value
16,470.09
Total Interest: 6,470.09
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Compound Interest Calculator: Growth on a Lump Sum
See how one deposit grows when interest is reinvested. Enter Principal, annual Interest rate (%), Years, and Compounding frequency (annually, semi-annually, quarterly, monthly, or daily). Results show Future value and Total interest earned. Handy for comparing savings products or explaining interest on interest. This is not a tax or fee model.
How to use
The formula is A = P × (1 + r/n)^(n×t). P is principal, r is the annual rate as a decimal, n is compounding periods per year, and t is years. Pick a frequency that matches your account. Bank savings often compound daily or monthly. Change years or rate to see how the curve moves.
Example
With 10,000 principal, 5% annual rate, 10 years, and monthly compounding (12), future value is about 16,470 and interest earned is about 6,470. The same rate compounded once per year lands near 16,289. More frequent compounding adds a modest lift at this horizon.
Tips
Quoted annual rates can compound differently in real contracts. This tool assumes a fixed rate with no deposits, withdrawals, inflation, or tax. Small rate gaps matter more over long periods. Check your bank disclosure before committing money.