Free Simple Interest Calculator – Principal, Rate & Time

The formula is SI = (P × R × T) / 100, where P is the principal, R is the annual rate of interest in percent, and T is the time in years. The total amount is the principal plus the simple interest.

Simple interest is calculated only on the original principal, so it stays the same each period. Compound interest is calculated on the principal plus accumulated interest, so it grows faster over time. This tool calculates simple interest.

Helperzy calculator mein principal, annual rate aur time (years) daalo. Tool SI = (P × R × T) / 100 formula laga kar interest aur total amount turant dikha deta hai. Sab kuch browser mein hota hai.

Yes. Convert the months into years by dividing by 12 and enter that as the time. For example, 6 months is 0.5 years. The calculator then returns the correct simple interest for that period.

Yes. Along with the interest, the calculator shows the total amount, which is the principal plus the simple interest. This is the figure you would repay on a simple-interest loan or receive on a simple-interest deposit.

It is accurate for loans that genuinely use simple interest. Many loans use reducing-balance or compound methods instead, so always confirm with the lender which method applies before relying on the figure.

Because simple interest is linear, doubling either the time or the rate doubles the interest, and doubling both quadruples it. You can test this directly by changing the inputs and watching the result.

Yes. The calculator runs entirely in your browser. The numbers you enter are never uploaded, logged, or shared, so your data stays on your own device.