See how an amount grows when interest is added to the balance. Set principal, annual rate, compounding frequency and years — in USD, EUR, GBP or BRL.
Compound interest pays interest on both the original money and the interest already earned.
Interest earned = A − P. Example: $1,000 at 5% compounded monthly for 10 years ≈ $1,647.
If you add money every month, the calculator uses the standard future-value-of-a-series formula on top of the compounded principal. Deposits are treated as happening at the end of each month.
Investing $100/month at 8% a year, compounded monthly:
Notice the pattern: the same monthly effort, but the last decade alone adds ~$90,000. Starting early beats investing more — and compounding frequency (monthly vs annual) also lifts the result.
All math runs in your browser. Your numbers are never sent to any server and never stored.
Interest calculated on the starting amount plus interest already earned. The balance grows faster than simple interest, which only pays on the original principal.
How often interest is added. Monthly (12 times a year) grows a little faster than yearly. Daily is only slightly faster than monthly at the same nominal rate.
No. This tool grows savings or investments. The Loan / EMI calculator works the other way: it finds the payment needed to pay a debt down.
Yes. Put a number in Monthly contribution. The extra deposits also earn compound interest for the remaining time.
No. The result is a pre-tax, pre-fee illustration. Real accounts may charge fees or withhold tax on interest.
Yes. Everything runs locally in your browser. Nothing is uploaded or stored.