A 15-year mortgage has a higher monthly payment but far less total interest. A 30-year mortgage is more affordable month-to-month but costs much more overall.
Plug the same balance into the mortgage calculator twice — once at 15 years, once at 30 — and compare the total interest for yourself.
Choose 15 years if you can comfortably afford the payment and want to minimize interest. Choose 30 years if you want a lower monthly obligation.