Compound Interest Calculator
Watch your savings grow — enter the principal, rate, years and compounding frequency to see the final amount and interest earned.
Compound interest is interest earned on both your original deposit and the interest already added, which is why savings and investments grow faster over time. This free calculator shows the power of compounding clearly: enter your principal, annual rate, number of years and how often interest compounds, and see the final amount alongside the interest you earned.
Enter the principal, rate, years and compounding frequency, then press Calculate Growth.
How to use the Compound Interest Calculator
- Enter the principal amount you are investing or saving.
- Enter the annual interest rate, the number of years, and choose how often interest compounds.
- Press Calculate Growth to see the final amount and the total interest earned.
Compound Interest Calculator — FAQs
Is this compound interest calculator free?
Yes, completely free with no signup and no limits. Test different rates, time periods and compounding frequencies as often as you like, and every figure is computed privately in your own browser without anything being uploaded or saved.
What is compound interest?
Compound interest is interest calculated on the original principal plus all interest added so far. Because each period's interest starts earning its own interest, money grows faster than with simple interest, and the effect becomes dramatic over long periods like ten or twenty years.
Does compounding frequency really matter?
Yes, though the difference is modest at low rates. Monthly compounding applies the rate twelve times a year, so interest starts earning interest sooner than with yearly compounding. Try both settings on the same inputs to see the exact difference.
Are taxes or inflation included in the result?
No. The calculator shows gross growth before any tax on profit and before inflation. For real-world planning, remember that inflation reduces purchasing power and that profit on savings may be taxable in your country of residence.