Compound Interest
Compute compound interest free in your browser from principal, annual rate, years and compounding frequency, including a continuous option.
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How to use this tool
- Enter the starting amount, annual rate and number of years.
- Pick yearly, quarterly, monthly, daily or continuous compounding.
- Read future value and interest earned, then download a PDF of the working.
About this tool
Compute compound interest free in your browser from principal, annual rate, years and compounding frequency, including a continuous option. Nothing is uploaded; future value and interest earned stay on your device, and you can download a one-page PDF of the working.
Privacy & limitations
Inflation, tax on interest and changing rates are not subtracted. Very large tenures can overflow and will be rejected.
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Frequently asked questions
How do I calculate compound interest?
The tool uses A = P × (1 + r/n)^(n×t), where P is the starting amount, r the annual rate, n the compounding periods per year and t the years. For 1,00,000 at 7% for 10 years compounded monthly, the future value is about 2,00,966, so interest earned is about 1,00,966.
How much difference does compounding frequency make?
More frequent compounding gives slightly more. The same 1,00,000 at 7% for 10 years grows to about 1,96,715 compounded yearly, against about 2,00,966 monthly. Choose yearly, quarterly, monthly, daily or continuous, which uses P × e^(r×t), to match your bank or scheme.
Does it include regular deposits, tax or inflation?
No. It models one starting amount growing at a fixed rate with no further deposits, no tax and no inflation adjustment. For monthly investments, use the SIP calculator instead. Real returns and your bank's rounding rules can differ from the figure shown.
Can I use it for loans or fixed deposits?
For a fixed deposit that compounds at a known rate, yes, as long as you pick the compounding your bank uses. For loans repaid in instalments, use the EMI calculator, because reducing-balance repayments are not the same as one lump sum compounding.