Simple Interest Calculator
Calculate simple interest on your principal amount. Find the total interest earned and maturity amount for fixed-rate investments and loans.
₹
%
Years
* All calculations are approximate.
Important — Read Before You Decide
- Simple interest is calculated only on the original principal, unlike compound interest which includes accumulated interest
- Government of India Treasury Bills (T-Bills) and short-term FDs typically use simple interest calculations
- RBI Savings Bonds and certain post office schemes like the Kisan Vikas Patra historically used simple interest for specific tenures
- For the same rate and period, simple interest always yields less than compound interest — the gap widens with longer durations
- Flat-rate personal loans and car loans in India often advertise simple interest, but the effective rate is nearly double due to reducing balance
- Simple interest is commonly used in intra-day and short-term margin trading calculations by Indian brokers
- Section 80TTA of the Income Tax Act allows a deduction of up to ₹10,000 on interest from savings accounts (simple interest basis)
- Understanding simple vs compound interest is essential before comparing FD rates across banks in India
What Happens If You Ignore These?
- Choosing a simple interest product over a compound interest one for long-term goals leads to significantly lower returns
- Misunderstanding flat-rate loan interest as true interest rate results in paying more than expected
- Ignoring the interest calculation method when comparing two investment options can lead to poor financial decisions
- Not reinvesting simple interest proceeds means missing out on the benefits of compounding
Smart Tips
- Use simple interest calculations for short-term loans and deposits where the difference from compound interest is minimal
- When comparing loan offers, always ask whether the quoted rate is flat (simple) or reducing balance — a 10% flat rate is roughly equivalent to an 18-19% reducing rate
- For long-term wealth building, prefer compound interest instruments like PPF, mutual funds, and recurring deposits over simple interest products
- Use the formula P x R x T / 100 for quick mental estimates — e.g., ₹1,00,000 at 7% for 5 years = ₹35,000 interest
- Park emergency funds in savings accounts or liquid funds where simple interest applies, and invest long-term savings where compounding works in your favour
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