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Free Online Compound Interest Calculator

Enter a starting amount, annual interest rate, how often interest compounds, and how long you leave the money invested. You see future value, total interest earned, and a simple growth chart.

Try an example
10000
7
10

📈 Results

Future Value: $20,096.61
Total Interest: $10,096.61
Principal: $10,000
Growth Over Time012345678910$10,000$20,097

How compound interest works

With compound interest, you earn returns on your principal and on interest already credited. That is why balances accelerate over long periods compared with simple interest (which only pays on the original deposit).

Formula: FV = PV × (1 + r/n)n×t, where PV is principal, r is annual rate, n is compounding periods per year, and t is years.

More frequent compounding (monthly vs annually) increases future value at the same stated rate. This calculator does not include taxes, fees, or additional contributions unless you run separate scenarios.

How to use this calculator

  1. Enter your starting principal.
  2. Set the expected annual interest rate.
  3. Choose compounding frequency (monthly is common for savings).
  4. Set the number of years and pick USD or INR if you like.
  5. Review future value, interest earned, and the growth chart.

Worked examples

Sample numbers you can try in the calculator above. Your lender's quote may differ slightly.

  • $10,000 at 7% for 10 years

    Illustrates long-run growth when interest compounds every month.

    $10,000 · 7% · monthly · 10 years

    Future value: Future value about $20,096

  • Higher rate, shorter term

    Shorter horizon but a higher rate still grows the balance noticeably.

    $5,000 · 9% · quarterly · 5 years

    Future value: Future value about $7,765

  • Daily compounding CD

    Daily compounding maximizes the effect at a given nominal rate.

    $20,000 · 4.5% · daily · 3 years

    Future value: Slightly more than annual compounding at 4.5%

  • INR savings example

    Useful for Indian fixed deposits and recurring deposit planning.

    ₹1,00,000 · 6% · monthly · 15 years

    Future value: Switch currency to INR in the tool

Frequently asked questions about the compound Interest Calculator

  • What is compound interest?

    Interest calculated on the initial principal plus accumulated interest from earlier periods.

  • What is the compound interest formula?

    FV = PV × (1 + r/n)^(n×t). The calculator applies this for you.

  • Which compounding frequency should I use?

    Match the product: many savings accounts compound daily or monthly; some bonds pay semi-annually.

  • Does this include taxes or fees?

    No. Results are before tax and without account fees unless you lower the rate to approximate them.