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Simple Interest Calculator
Calculate simple interest on a loan or deposit — principal, rate and time in, interest and total out.
- Instant results
- No signup
- Remembers your inputs
- Rates checked Oct 2026
How the simple interest calculator works
SI = P × R × T ÷ 100.
How to use it
- Move the sliders or type exact figures — results update as you go.
- Read the highlighted result first, then the breakdown and chart.
- Open the year-by-year table to plan ahead, or copy the result into your notes.
Frequently asked questions
Simple vs compound interest?
Simple interest is charged only on the principal. Compound interest is charged on principal plus accumulated interest, so it grows faster.
Results are estimates for planning, not financial, tax or investment advice. Rates and rules change — confirm with your bank, the scheme's official notice or a CA. Last reviewed 13 October 2026.