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Simple Interest Calculator
Free simple interest calculator — interest on the original principal only using I = P × r × t.
Last updated 2026-09-18
Amount
₹1,40,000
Interest
₹40,000
How it works
I = P × r × t. Amount = P + I.
How to use this calculator
- Enter the inputs shown above (amount, rate, tenure, income, or other fields).
- Read the live results — they update as you type.
- Check the formula, worked example, and assumptions on this page before you decide.
Formula
I = P × r × t. Amount = P + I.
Worked example
₹1 lakh at 8% for 5 years earns ₹40,000 simple interest.
Reading the result
Treat the output as a planning figure. Compare it with your sanction letter, payslip, or GST invoice rather than treating it as a filing or a loan offer.
See also: calculation methodology and disclaimer.
Frequently asked questions
No. EMI loans use reducing-balance (compound in effect). Simple interest is for teaching and some short deposits.
Assumptions and limits
- This is a planning estimate. Your lender, employer, or tax officer may use different inputs or rounding.
Results are educational estimates, not tax, legal, investment, or medical advice, and not a loan offer. Verify filings and payments with the official authority or a qualified professional.