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Money & finance

Interest calculator

Calculate simple interest and final capital.

Your result

Complete the fields and calculate.

Calculation method and formula

Starting capital × (1 + Annual interest [%] ÷ 100 × Term [years])

Understand the inputs

Starting capital
Use a measured value or your own assumption.
Annual interest
Unit: %. Use a measured value or your own assumption.
Term
Unit: Jahre. Use a measured value or your own assumption.

Assumptions and limitations

This uses simple interest without reinvestment. Multi-year investments that earn interest on previous interest require a compound-interest model.

The formula uses the specified units. Displayed numbers are rounded; whole packs, item counts and full time periods may also be rounded within the calculation.

Worked example

Illustrative values. Replace them with your own inputs for your calculation.

Starting capital
10000
Annual interest
5 %
Term
3 years
Example result11,500

Interest: 1,500

Model revision: October 17, 2026 · How CleverCalc works

FAQ

Frequently asked questions

How does Interest calculator work?+

Starting capital × (1 + Annual interest [%] ÷ 100 × Term [years]). This uses simple interest without reinvestment. Multi-year investments that earn interest on previous interest require a compound-interest model.

What assumptions should I consider for this result?+

This uses simple interest without reinvestment. Multi-year investments that earn interest on previous interest require a compound-interest model. The formula uses the specified units. Displayed numbers are rounded; whole packs, item counts and full time periods may also be rounded within the calculation.

How accurate is the result?+

The formula uses the specified units. Displayed numbers are rounded; whole packs, item counts and full time periods may also be rounded within the calculation. Prices, measurements and model assumptions determine how well the result represents your situation.

Is this calculator free?+

Yes. Calculations and PDF export work without an account or registration.

What happens to my inputs?+

Calculations run in your browser. Results are saved locally only when you add them to My results; favourites and history are also local. Shared links contain your values. The currency tool requests the selected currencies from its rate provider without sending your amount.

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