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Compound Interest Calculator

Project a balance with a fixed nominal rate and regular compounding. No contributions, withdrawals, taxes or fees are included.

Enter your values

Enter a numeric value. Use a non-negative value.
%
Enter the percentage as a number: for 15%, enter 15. Use the annual rate. Use a non-negative value. Allowed range: 0–100.
Enter a numeric value. Use a whole number. Must be greater than zero. Allowed range: 1–365.
Enter a numeric value. Use a non-negative value. Allowed range: 0–100.

Use a decimal point, without thousands separators.

Example result
Final balance
22,196.40234545
Interest12,196.40234545

The initial result uses the example values. Enter your own values and calculate again.

Edit inputs

How it works

Project a balance with a fixed nominal rate and regular compounding. No contributions, withdrawals, taxes or fees are included.

Inputs and units
Compound Interest Calculator · Inputs and units
InputExample valueWhat to enter
Principal10,000Enter a numeric value. Use a non-negative value.
Nominal annual rate8 %Enter the percentage as a number: for 15%, enter 15. Use the annual rate. Use a non-negative value. Allowed range: 0–100.
Compounds per year12Enter a numeric value. Use a whole number. Must be greater than zero. Allowed range: 1–365.
Years10Enter a numeric value. Use a non-negative value. Allowed range: 0–100.
A = P(1+r/n)ⁿᵗ

Worked example

Show example inputs and results

This example is generated by the same calculation engine using the starting values in the form. Your own inputs produce your own result.

Principal
10,000
Nominal annual rate
8 %
Compounds per year
12
Years
10

Complete example results

Final balance
22,196.40234545
Interest
12,196.40234545

Reading the result

Match the rate period to the payment period. Fees and taxes absent from the inputs are not added automatically; compare totals with the same cost coverage.

Questions and answers

Can I use the example values for my own calculation?

The example values illustrate the calculation. Replace every input with your own information, especially dates, rates and the selected operation.

Why are some results rounded?

Results display up to 8 decimal places. Calculations use the unrounded values; very small values use scientific notation. JavaScript floating-point arithmetic can introduce tiny rounding differences.

Are my inputs sent to a server?

The calculator processes inputs in your browser. Its code does not send your values to a server.

Methods & accuracy

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