Finance · Loans
Simple Interest Calculator
Calculate simple interest and total amount — live as you move the sliders, with growth over time.
Your simple interest plan
1,000 – 10 Crore
1% – 20%
1 – 120 months
Simple interest
—
Growth over time
Principal vs interest by year
How this calculator works
Simple interest is calculated on the original principal only — not on accumulated interest. Move principal, rate, and tenure to see interest and total amount update instantly.
Tenure is in months (1–120). Examples below are shown in years for easy comparison.
- Enter principal amount (₹1,000 – ₹10 Crore).
- Set annual interest rate (1% – 20%).
- Set tenure in months (1 – 120).
- Read simple interest, total amount, and the growth chart — results update live.
Formula
SI = (P × R × T) / 100
Amount = P + SI
T is time in years (months ÷ 12).
Examples
More about this calculator
Practical use cases
- Short personal loans that quote flat / simple interest.
- School and college maths problems with P, R, T.
- Quick estimate before comparing with reducing-balance EMI.
Common mistakes
- Using simple interest when the bank charges reducing-balance EMI — results will look cheaper than reality.
- Mixing months and years in the time field.
Tips
- For home, car, and personal loans, prefer the EMI calculator.
- Compare SI vs compound interest when you invest rather than borrow.
FAQs
SI = (P × R × T) ÷ 100, where P is principal, R is annual rate in percent, and T is time in years (months ÷ 12).
Usually not. Most retail loans use reducing-balance EMI. Use the EMI calculator for those.
The slider uses months (1–120) for finer control. Examples are labelled in years because most borrowers think in annual terms.