Conceptually, it’s easy to grasp why and when you should refinance your mortgage. In practice, inertia is the main reason people hold back from refinancing. With that in mind, we present these mortgage calculator which will allow you to see how your current mortgage will compare with the mortgage you are considering. Perhaps if the math is enticing, you’ll shop around? Enjoy!

We’d like to thank Hugh Chou for compiling the equations that we needed to create this calculator, and Ironman at Political Calculations for providing the calculator framework.