Simple Interest Calculator
Simple Interest Calculator
Enter any three of the four values below — principal, rate, time, and total accrued amount — and the one you leave out is calculated automatically using the simple interest formula:
Total principal amount, if known
Interest rate, % per year
Time period, based on the selection above
Total (principal + interest)
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What do the symbols mean?
| A | Total accrued amount, i.e. principal + interest |
| P | Principal amount |
| I | Interest amount |
| r | Rate of interest per year, r = R / 100 |
| t | Time period involved, in years (the calculation period) |
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