Mortgage points calculator
Lenders let you pay discount points up front to lower your interest rate. One point costs 1% of the loan. This calculator works out the cost of the points, your reduced rate, the resulting monthly payment saving, and the break-even point where the saving has paid back the cost.
Buying points makes sense when you keep the loan well past break-even; if you might refinance or move sooner, the up-front cost may not be recovered. Everything stays in your browser.