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Online Interest Calculator

Compute interest on loans, savings accounts and more with Wolfram|Alpha

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Powerful interest rate computation for any loan or investment

Wolfram|Alpha can quickly and easily compute interest on student loans, savings accounts or other investment instruments, with extensive options covering compounding frequencies, maturity dates and more. Plots and tables are automatically generated to help you visualize interest payments over time or the effect of different rates or compounding periods on total interest earned.

Interest results with plots, equations and answers

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Enter your queries using plain English. Your input can include complete details about loan amounts, down payments and other variables, or you can add, remove and modify values and parameters using a simple form interface.

Interest basics

Interest is a fixed charge for borrowing money, typically represented as a percentage of the total amount of money borrowed.

Compound interest means that interest is earned not only on the principal (the sum originally borrowed), but also on all interest previously earned at specified compounding periods. The interest portion of a specific payment on a bond, mortgage or other loan can also be computed given a loan amount, interest rate, number of compounding periods and specified period number. Plots are automatically generated to show useful context for each type of interest computation, including amortization tables and charts visualizing relative amounts of principal and interest paid on a given loan.