The National Pork Board suggests cooking pork tenderloin at 425 degrees Fahrenheit and roasting the meat for approximately 20 minutes per pound. The National Pork Board, BBCgoodfood.com and GourmetSleuth.com have roasting calculators and timetables online.
The weight of the meat and the oven temperature are the basis for the times calculated by roasting calculators and timetables. Cooks should use a meat thermometer to ensure the pork reaches a safe temperature. The internal temperature of pork tenderloin should be 155 degrees Fahrenheit immediately after cooking and 160 degrees Fahrenheit after resting for five minutes, according to GourmetSleuth. The internal temperature should be between 140 degrees Fahrenheit and 160 degrees Fahrenheit and then the pork should rest for three minutes, states the National Pork Board.