About the Simple Interest Calculator
Simple Interest Calculator does the math for you. Enter your values in the format shown and the result appears immediately — no spreadsheets, no formulas to remember, and nothing is uploaded to a server.
How Simple Interest works
Simple interest is charged only on the original principal:
interest = principal × rate × time / 100total = principal + interest
Worked example — 00 at 5% for 3 years:
- Interest: 1000 × 5 × 3 / 100 = 150
- Total amount: 1000 + 150 = 1150
How to use
- Enter your values as shown in the input box.
- The result is calculated instantly.
- Click Copy to use it.
Examples
| Input | Result |
|---|---|
00, 5%, 3 yr | 0 interest, 50 total |
00, 7%, 2 yr | 0 interest, 00 total |
Common uses
- Quick everyday math.
- Double-checking figures fast.
- Schoolwork and homework.
- Finance, health and planning.
Frequently asked questions
Is my data uploaded?
No — the calculation runs entirely in your browser, so your data stays private.
Is it free?
Yes — completely free with no sign-up.