Tools / Interest calculator
Work out interest.
Amount, rate and dates in. Interest to the day out.
Days are the actual days between the dates (the start date is not counted), divided by 365, even in a leap year. Compound interest uses (1 + rate ÷ n) to the power n × days ÷ 365. Check the rate and method in your loan or agreement.
Worked out in your browser. Nothing you type is sent anywhere.
How to use it
- Type the amount and the yearly rate.
- Pick the from and to dates.
- Choose simple or compound. Copy the one-line summary.
Questions
How are the days counted?
The actual number of days between the dates, divided by 365, even in a leap year. The start date is not counted.
How is compound interest worked out?
As amount × (1 + rate ÷ n) to the power n × years, minus the amount. n is 1, 4 or 12 times a year, and years is days ÷ 365.
Is what I type sent anywhere?
No. It's worked out in your browser. Nothing you type leaves your device.