Online Calculator offers simple and easy free calculator online. We offer a collection of online calculators such as mortgage calculator, loan calculator, mortgage payment calculator, basic calculator, math calculator and other financial calculators. Basic Calculator: The simple and basic calculator is useful when you have to do basic calculations such as plus, minus, multiply, and divide. It is a math calculator that allows you to do basic arithmetic. You may use it for school, home and work to calculate grade, money or anything you can think of. Financial Calculator: If you need to calculate financial information, you may want to check out our set of financial calculators. You can use the mortgage calculator to calculate mortgage for your house, car or any other mortgages that you may have. You can also use the loan calculator to calculate any loan you may have. If you do any kind of investments, you can use the compound interest calculator to see how much your money can grow after a certain years.