Simple Interest Calculator
Calculate simple interest and total amount.
- 100% free
- Private in browser
- No signup
- No watermarks
Result
- Total amount
- 14,000
- Interest earned:
- 4,000
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About Simple Interest Calculator
Simple interest is charged only on the original principal, making it easy to work out for short-term loans and deposits. This Simple Interest Calculator on TheToolss uses the standard formula, SI = P × R × T ÷ 100, to return both the interest earned and the final maturity amount. Enter your principal, annual rate, and time in years, and the result updates instantly. Use it to compare loan quotes or check what a fixed deposit will pay. It runs in your browser — free, private, and no signup.
How to use Simple Interest Calculator
- Enter the principal amount.
- Enter the annual interest rate and time in years.
- Read the simple interest and total amount.
Key features
- Instant SI = P×R×T/100 calculation
- Shows interest and total payable
- Works for any currency
- No rounding surprises
- Private in-browser calculation
Frequently asked questions
- Is the Simple Interest Calculator free?
- Yes. It is free on TheToolss with no signup.
- What is the simple interest formula?
- Simple Interest = Principal × Rate × Time ÷ 100, where rate is per year and time is in years.
- How is it different from compound interest?
- Simple interest is calculated only on the principal; compound interest is calculated on the principal plus accumulated interest.
- Can I use months instead of years?
- Enter the time in years — for 6 months use 0.5, for 18 months use 1.5.
- Is my data uploaded?
- No. The calculation runs entirely in your browser.
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