Use the Simple Interest Calculator
Interest calculated only on the original principal — no compounding.
- Free to use
- No signup
- Nothing to install
- Runs in your browser
Illustration. Open the tool for the real thing.
See it in action
The Simple Interest Calculator with sample data entered and the result showing.
What is the Simple Interest Calculator?
Interest calculated only on the original principal — no compounding.
Fill in the fields and the page works out the result for you.
3 steps to your result
Open the tool and follow along. Nothing to install.
What you get
Principal ($), Annual Rate (%), Time (Years)
Interest Earned, Principal.
Part of the Investment & Interest group of AZRS calculators.
AZRS tools are free to open and use.
It opens in your browser, so there is nothing to download.
Used for
Pick one to see how it fits.
How it compares
A plain look at this tool next to the usual alternative.
| This calculator | Desktop software | |
|---|---|---|
| Install | Nothing to install | Usually an app or program to install |
| Account | No signup | Depends on the product |
| Cost | Free to use | Free or paid, depends on the product |
| Where it runs | In your browser tab | On your computer |
Questions people ask
What does the Simple Interest Calculator do?
Interest calculated only on the original principal — no compounding.
Which formula does it use?
The page lists the formula as I = P × r × t.
Is the result financial advice?
No. It is an estimate to help you plan. Check important decisions with a qualified professional.
Do I need an account to use the Simple Interest Calculator?
No. Open the page and enter your numbers.
How do I use the Simple Interest Calculator?
1. Open the Simple Interest Calculator. 2. Enter the values it asks for: Principal ($), Annual Rate (%), Time (Years). 3. Read the result: Total Amount and the figures listed under it.
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Try the Simple Interest Calculator now
Interest calculated only on the original principal — no compounding. Free to use.
Try it free