Free Simple Interest Calculator
I = P × r × t, instantly.
$1500.00
Interest
$11500.00
Total
$500.00
Per year
$41.67
Per month
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How to use the Simple Interest Calculator
- 1Enter principal, rate, years.
- 2See interest and total.
Features
- Total & interest
- Monthly option
- Instant
Frequently Asked Questions
When is simple interest used?
Auto loans, short-term notes and some bonds — anywhere interest doesn’t compound.
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About the Simple Interest Calculator
Calculate simple (non-compounding) interest for flat-rate loans and short terms. The Simple Interest Calculator runs entirely in your browser — your data is processed locally and never uploaded to a server. Explore more Calculators tools or browse all free online tools.