Calculate simple interest on the principal only I Prt. The simple interest formula is fairly simple to compute and to remember as principal times rate times time. Interest rates are typically expressed as a percentage.
T Time Periods involved.
How to Calculate Simple Interest. Breaking Down the Formula The total accrued increased amount A can be found by multiplying the principal amount P of an investment by the product of one plus the interest rate r and time period involved t. I Interest Amount. R 004 Now apply the formula.