How to Calculate Simple Interest
Simple interest = principal x annual rate x years. 1,000,000 JPY at 0.1% for 5 years earns 1000000 x 0.001 x 5 = 5000 JPY. Compound interest grows faster (non-linear).
Open the interactive Everyday Lifestyle tool →Formula: I = principal x rate x years
Key facts
| Formula | I = principal x rate x years |
|---|---|
| Example principal | 1,000,000 JPY |
| Annual rate | 0.1% (0.001) |
| 5 years | 5000 JPY |
Frequently asked questions
What interest does 1,000,000 JPY earn at 0.1% for 5 years?
5000 JPY: 1000000 x 0.001 x 5 = 5000 JPY (simple interest).
What is the difference from compound interest?
Simple interest is linear in time; compound interest adds interest on interest and grows faster.
How do I get a monthly figure?
Divide the annual interest by 12, or use years as a fraction (e.g., 0.5 for 6 months).
Related pages
Simple Interest Calculator is part of Everyday Lifestyle on GOAT Lab — a free reference you can use without signing up, and it works offline. Open the tool above for any custom value.
Part of GOAT Lab — 26 free, browser-based science, engineering and developer tools. No sign-up.