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 Compound Interest Calculator Monthly Loan Calculator Daily Calorie Calculator Stay Healthy Calculator Age Calculator BMI Calculator (Body Mass Index) CPM Advertising ROI Calculator Percentage Calculator