Investing & Finance

Compound interest calculator

Estimate end capital with compound interest from principal, interest rate, term and optional recurring contributions.

Updated on Apr 21, 2026 Calculator, calculation path and examples on one page

Calculator

Starting capital

interest rate per year

Duration in years

interest interval

Regular deposit per interval

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Examples

10,000 euros at 4.5 percent for 12 years.

Final capital: €16,958.81

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5,000 euros, 100 euros per month.

Final capital: €37,297.41

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20,000 euros, 250 euros per quarter.

Final capital: €36,364.56

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FAQ

What is compound interest?

Interest is added to the capital and interest is paid again in the next period.

Can I consider regular deposits?

Yes, you can enter a fixed amount per interest interval.

What happens at 0 percent interest?

Then the calculator only adds up starting capital and deposits.

Why is monthly interest stronger than annual interest?

Because the interest is credited more frequently and interest is charged again.

Is the result guaranteed?

No, the calculator only depicts a mathematical scenario.

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Sources and notes