-Medium Rare: 130 – 135 degrees F internal temperature – about 16 minutes/lb.-Medium Well: 140 – 145 F internal temperature – about 18 minutes/lb.-Well-Done: 150 – 155 F internal temperature – about 20 minutes/lb.
For 4-5 lbs roast check internal temperature after 1 hour. For 2-3 lbs roast, check after 45 minutes. Continue to check often as it nears end of cooking time.