Roast Cooking Time Calculator
Planning a roast means estimating how long it sits in the oven plus resting time, so the meal lands on schedule. This calculator multiplies your roast weight by the minutes per pound from your recipe, adds a fixed searing or preheat allowance and a resting period, and returns the total time from oven-in to serving. Minutes per pound depends on the cut, oven temperature and target doneness, so it is a user-editable input. The clock is only a plan: always verify the FSIS safe internal temperature with a thermometer at the thickest point before serving.
Roast time formula
oven time = weight (lb) * minutes per pound + fixed minutes
oven time (hours) = oven time / 60
total time = oven time + resting time
total time (hours) = total time / 60
The estimate is a planning tool. Doneness is confirmed by internal temperature, not time, because thickness and oven calibration vary.
FSIS safe internal temperatures
- Whole beef, pork, lamb and veal: 145 deg F, then rest 3 minutes.
- Ground meats: 160 deg F.
- All poultry: 165 deg F.
- Use a calibrated probe at the thickest part, away from bone.
- Minutes per pound is a recipe estimate, not a safety figure.
Roast cooking time: frequently asked questions
How is roasting time estimated?
Roasting time is approximated as weight times minutes per pound, plus any fixed initial searing time. A 5 pound roast at 20 minutes per pound is about 100 minutes. Minutes per pound depends on the meat, oven temperature, and your target doneness, so it is a user-editable input. Always confirm doneness with a thermometer, not the clock.
What is the safe internal temperature?
USDA FSIS guidance: whole cuts of beef, pork, lamb and veal are safe at 145 deg F with a 3 minute rest; ground meats at 160 deg F; all poultry at 165 deg F. The clock only estimates timing; the thermometer reading at the thickest point is what confirms safety.
Why does minutes per pound vary so much?
Cooking time per pound depends on oven temperature, the cut's shape and thickness, whether it is boneless or bone-in, starting temperature, and target doneness. A low slow roast needs far more minutes per pound than a hot fast roast. Because there is no single official figure, you enter the value from your recipe.
Should I include resting time?
Yes. Resting lets juices redistribute and the internal temperature carry over by several degrees. This calculator adds a resting period you specify to give a total time from oven-in to serving, so you can plan the meal around it.
Does a bigger roast take proportionally longer?
Not exactly. Heat penetrates by thickness, not weight, so a roast twice as heavy but the same diameter does not take twice as long. The minutes-per-pound rule is a rough planning estimate; for thick or oddly shaped roasts, rely on a probe thermometer to the FSIS safe temperature.
Official sources
- USDA: Food Safety and Inspection Service (safe minimum internal temperatures).
- USDA: FoodData Central.
Reviewed by the CalculatorHub team, edited by James Graham, 17 June 2026. See our methodology.