Simple Interest Calculator
Calculate simple interest, where interest is earned only on the original principal.
Inputs explained
- Principal Amount — The starting sum of money. Example: 10000.
- Annual Interest Rate (%) — The yearly interest rate. Enter 5 for 5%.
- Time Period (Years) — How many years the money is invested or borrowed. Example: 3.
- Payment Frequency — How often interest is paid out — Monthly, Quarterly, Half-Yearly, or Yearly.
How to use it
- Fill in the fields above — each input has a hint describing exactly what to enter
- Press Calculate to get your result instantly, right on this page
- Copy the result, save the tool to favorites, or share and embed it anywhere
Understanding the result
Example: $10,000 at 5% for 3 years earns $1,500 in simple interest.
Frequently asked questions
Is the Simple Interest Calculator free to use? Yes — it is completely free, with no sign-up, no download and no usage limits. You can use it as often as you need.
Is my data private? Yes. The calculation runs entirely in your browser — the values you enter are never sent to our servers, stored or shared with anyone.
What information do I need? Just the following: Principal Amount, Annual Interest Rate (%), Time Period (Years), Payment Frequency. Each field includes a hint explaining exactly what to enter.
Can I use it on my phone? Yes — the tool is fully responsive and works on any device, and the same calculator is available in the EasyWorkCalcs mobile app.
Privacy
Everything you enter into the Simple Interest Calculator is processed entirely in your browser. Nothing is uploaded, stored or shared — your data stays on your device.