Simple Interest Calculator Calculate a simple interest with this simple calculator by just using a principal amount, interest rate and term of loan. Just enter the principal, interest rate and term of loan and hit Submit to get your simple interest, and total plus interest. Simple Interest: A=i+(prt) Principal $ Interest Rate (%) % Term of Loan Calculate Reset Related Tools Prime Number Finder Simple Interest Calculator CPM Advertising ROI Calculator Percentage Calculator Square Root Calculator Monthly Loan Calculator Daily Calorie Calculator Compound Interest Calculator