Simple Interest Calculator

Calculate simple interest using formula SI = P×R×T/100 for loans, fixed deposits, and investment planning

Simple Interest Analysis

₹0.00 Simple Interest
₹0.00 Principal Amount
₹0.00 Total Amount
Interest Rate: 0.00% p.a.
Time Period: 0 years
Monthly Interest: ₹0.00

Loan Interest Analysis

₹0.00 Total Interest
₹0.00 Total Repayment
₹0.00 Payment Amount
Loan Principal: ₹0.00
Interest Rate: 0.00% p.a.
Interest Burden: 0.00%

Investment Returns

₹0.00 Interest Earned
₹0.00 Maturity Value
₹0.00 Regular Payout
Principal Investment: ₹0.00
Annual Returns: ₹0.00
Growth Multiple: 0.00x

How to Use the Simple Interest Calculator

Our comprehensive simple interest calculator provides essential tools for interest calculations across different financial scenarios:

🔢 Basic SI Calculator

Calculate simple interest using standard formula: SI = (P × R × T) / 100, where P is principal, R is rate per annum, T is time. Can solve for any variable when others are given. Simple interest doesn't compound - interest is earned only on principal amount.

💳 Loan Interest Calculator

Calculate total interest payable on loans using simple interest method. Personal loans, gold loans, and some business loans use simple interest. Total repayment = Principal + Simple Interest. Helps in loan planning and comparing offers from different lenders.

📈 Investment Returns Calculator

Calculate returns on fixed deposits, NSC, government bonds, and other simple interest investments. For FDs with payout options, interest is calculated using simple interest formula. Cumulative deposits reinvest interest, while payout options provide regular income.

Key Applications: Simple interest used in short-term loans, government bonds, fixed deposits with payout, NSC, Kisan Vikas Patra. Unlike compound interest, SI grows linearly. Useful for quick interest calculations and comparing with compound interest options.

Frequently Asked Questions

What is the simple interest formula?
Simple Interest formula is SI = (P × R × T) / 100, where P = Principal amount, R = Rate of interest per annum, T = Time period in years. Total Amount = Principal + Simple Interest. Example: ₹10,000 at 8% for 3 years = (10,000 × 8 × 3) / 100 = ₹2,400.
How is simple interest different from compound interest?
Simple interest is calculated only on principal amount, while compound interest includes interest on previously earned interest. SI grows linearly, CI grows exponentially. For ₹10,000 at 10% for 3 years: SI = ₹3,000, CI = ₹3,310. Difference increases with time and rate.
Which investments use simple interest calculation?
Simple interest is used in: Fixed deposits with monthly/quarterly interest payout, Government bonds, NSC (partial), Personal loans, Gold loans, Short-term deposits, Treasury bills. These don't compound interest but pay regular interest based on original principal.
How to calculate simple interest for months or days?
For months: SI = (P × R × M) / (100 × 12), where M = months. For days: SI = (P × R × D) / (100 × 365), where D = days. Example: ₹50,000 at 9% for 6 months = (50,000 × 9 × 6) / (100 × 12) = ₹2,250.
Can I use simple interest calculator for loan EMI?
Simple interest calculator is not suitable for EMI loans as they use compound interest and reducing balance method. Use it for loans with simple interest like some personal loans, gold loans where total interest is fixed upfront. For EMI calculations, use compound interest or EMI calculator.