When shopping for a car, one of the biggest decisions is whether to buy or lease. This calculator helps you compare the total cost of each option, so you can make an informed choice that fits your budget and lifestyle. Keep in mind that the most cost-efficient option over the long term is often to purchase a year-old, low-mileage vehicle with cash—avoiding interest payments and sidestepping much of a vehicle's initial depreciation. However, for most people, that is a significant amount of money to spend all at once. So this calculator helps you weigh the two most common alternatives.