Simple Interest Calculator
Interest earned or owed using the straight-line simple interest formula.
%
yrs
Total amount
$5,900.00
$900.00 interest
Principal
$5,000.00
Interest
$900.00
Per year
$300.00
ShowHide the working
- 1Interest = $5,000.00 × 6% × 3 years = $900.00
- 2Total = $5,000.00 + $900.00 = $5,900.00
Formula
I = P × r × t ÷ 100How it works
Simple interest is charged only on the original principal — unlike compound interest, earned interest never itself earns interest.
Example
$5,000 at 6% for 3 years earns $900, giving $5,900.
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About the Simple Interest Calculator
Interest earned or owed using the straight-line simple interest formula. It sits in the Finance & Loans section of NWS Calc, a free collection of calculators that run entirely in your browser. There is no signup, no paywall and no tracking — open the page, enter your numbers, get an answer.
Frequently asked questions
- Is the Simple Interest Calculator free to use?
- Yes. Every calculator on NWS Calc is completely free, with no signup, no usage limits and no ads.
- Does my data leave my device?
- No. The Simple Interest Calculator runs entirely in your browser using JavaScript. Nothing you type is uploaded, logged or stored on a server.
- Can I use the Simple Interest Calculator on my phone?
- Yes. The page is fully responsive and works in any modern mobile or desktop browser — there is nothing to install.
- What else is in Finance & Loans?
- Loans, mortgages, interest, savings and investment returns. You can browse the full Finance & Loans category for related calculators.