How does this calculator work?

Enter the requested values, select the appropriate options, then calculate. The result is an estimate based on the formula used by this calculator.

Are calculator results guaranteed to be exact?

Results are estimates based on the inputs and formula used by the calculator. Review the assumptions and use professional advice where appropriate.

ONLINE CALCULATOR

Compound Interest Calculator

Initial amountAnnual interest rate (%)YearsCompounds per year

ResultCalculated for the selected inputs

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What Is the Compound Interest Calculator?

A compound interest calculator shows how an amount can grow when interest is added to the balance and future interest is calculated on the updated balance. Use it to explore how rate, time and compounding frequency change growth.

How to Use the Compound Interest Calculator

Enter the values requested by the calculator.
Check the units and assumptions for each field.
Select Calculate to generate the result.
Change an input and calculate again if you want to compare scenarios.

Calculation Method

A = P(1 + r/n)^(nt), where P is principal, r is annual rate as a decimal, n is compounding periods per year and t is years.

Example

Example: enter the values relevant to your Compound Interest Calculator scenario, calculate the result, and then change one input at a time to see how that specific variable affects the outcome.

Understanding the Result

The result is determined by the inputs required for Compound Interest Calculator, the units used, and the assumptions built into its calculation. Review each field before comparing results.

Tips and Notes

For a useful comparison, keep units consistent and test more than one realistic scenario. When the result affects an important financial, health, legal, or technical decision, verify key assumptions with an appropriate authoritative source.