Simple Interest Calculator
Calculate simple interest on your investments and loans. Get detailed yearly breakdown and share your calculations with others.
Simple Interest Calculator
About This Calculator
Simple Interest is calculated using the formula: SI = (P × R × T) / 100, where P is the principal amount, R is the rate of interest per annum, and T is the time period in years.
Unlike compound interest, simple interest is calculated only on the principal amount throughout the investment period. This calculator provides a detailed yearly breakdown and allows you to share your calculations with others through a shareable link.
Simple Interest Formula:
Simple Interest = (Principal × Rate × Time) / 100
Total Amount = Principal + Simple Interest
Features:
- Calculate simple interest for any time period
- Yearly breakdown of interest accumulation
- Shareable calculation links
- Auto-calculation from shared URLs
- Compare with compound interest
Use Cases:
- Fixed deposit calculations
- Loan interest calculations
- Investment planning
- Educational purposes
Frequently Asked Questions
What is simple interest and how is it calculated?
Simple interest is calculated only on the principal amount, not on accumulated interest. Formula: SI = (P × R × T) / 100, where P is principal, R is annual rate, and T is time in years. For example, ₹10,000 at 10% for 3 years: (10,000 × 10 × 3) / 100 = ₹3,000 interest. Total amount = ₹13,000.
What is the difference between simple and compound interest?
Simple interest is calculated only on principal, while compound interest includes interest on interest. ₹10,000 at 10% for 10 years: Simple interest = ₹20,000 total (₹10,000 interest), Compound interest = ₹25,937 total (₹15,937 interest). Compound interest yields significantly more over long periods.
When is simple interest used?
Simple interest is used for: Short-term loans (personal loans, car loans), Some fixed deposits (though most use compound), Educational loans, Government schemes with simple interest, Trade credit arrangements, Certain types of bonds. Most long-term investments use compound interest.
How to calculate simple interest on a loan?
For loans, simple interest = (Principal × Rate × Time) / 100. For a ₹5 lakh loan at 12% for 3 years: (5,00,000 × 12 × 3) / 100 = ₹1,80,000 interest. Total repayment = ₹6,80,000. Monthly EMI would be approximately ₹18,889 (total amount / 36 months).
What is the simple interest on ₹1 lakh for 5 years at 8%?
Simple interest = (1,00,000 × 8 × 5) / 100 = ₹40,000. Total amount = ₹1,40,000. This is linear growth - same interest each year (₹8,000 annually). With compound interest at same rate, the amount would be higher due to interest on interest.
Is simple interest better than compound interest?
For borrowers, simple interest is better as you pay less total interest. For investors, compound interest is better as you earn more. Simple interest is predictable and easier to calculate but yields lower returns over time. Compound interest accelerates wealth building significantly.
How does time period affect simple interest?
Simple interest grows linearly with time. ₹10,000 at 10%: 1 year = ₹1,000 interest, 5 years = ₹5,000 interest, 10 years = ₹10,000 interest. The interest amount is directly proportional to time - double the time, double the interest. Unlike compound interest, there's no acceleration.
What investments use simple interest?
Investments typically using simple interest: Some government small savings schemes, Certain types of bonds, Trade credit arrangements, Short-term fixed deposits (some banks), Educational loans (student loans). Most long-term investments like PPF, EPF, mutual funds use compound interest.
How to convert simple interest to compound interest?
You can't convert - they're different calculation methods. However, you can compare both for the same principal, rate, and time to see the difference. Use our compound interest calculator alongside simple interest to compare outcomes and understand the power of compounding.
What is the formula for total amount in simple interest?
Total Amount = Principal + Simple Interest. Simple Interest = (P × R × T) / 100. So, Total Amount = P + (P × R × T) / 100. For example, ₹10,000 at 10% for 3 years: Amount = 10,000 + (10,000 × 10 × 3) / 100 = 10,000 + 3,000 = ₹13,000.