How to use Interest Calculator
- Enter the labelled values using the units shown beside each field.
- Select the calculation mode, unit, rate or date option needed for your scenario.
- The result includes a clear summary and, where useful, a calculation breakdown. You can copy values, recalculate or reset the form.
What Interest Calculator does
Calculate simple or compound interest, final balance and interest earned from principal, rate and duration.
Result and export
The result includes a clear summary and, where useful, a calculation breakdown. You can copy values, recalculate or reset the form.
Privacy and processing
The calculation runs locally in your browser and the entered values are not uploaded.
Limits and common errors
Results are estimates based on the values and assumptions entered. Verify financial, health, legal or safety-critical results independently.
Frequently asked questions
What should I enter?
Enter the labelled values using the units shown beside each field.
What result will I get?
The result includes a clear summary and, where useful, a calculation breakdown. You can copy values, recalculate or reset the form.
Is my information uploaded?
The calculation runs locally in your browser and the entered values are not uploaded.