The calculator on this page will show you just how much time and money you can save by using the “snowball” technique for paying down your debt. Choose your highest interest rate loan (boulders) or your lowest balance loan (pebbles) first. The calculator will determine how long it takes to pay off that loan. It then adds your previous payment to your next biggest/highest interest rate loan payment, and calculates the payoff time. It repeats the calculation until all your debt is paid off. I’m using this technique to pay off my $209,000 student loan debt as fast as possible.