Calculators & Formulas
Payment Calculators provides a collection of easy-to-use payment (and other) calculators. Each calculator comes with explanation of how the calculation works, and the formula(s) with which the calculations are performed. So, aside from using the calculators to get the answers for which you are looking, you can also learn the mathematical formulas. You are free to use the formulas in any way you see fit, even in your own projects--after all, they are math, and math is a universal language available to anyone able and willing to learn to 'speak' it.