Beef Roast Time Calculator
USDA beef roast times by cut at 325 F, with 145 F plus rest rule.
What it does
Beef roasts cook by rate tables, not thermometers alone: bone-in rib runs 23 to 25 minutes per pound at 325 F while boneless needs 28 to 33 and round 30 to 35. Tenderloin breaks the pattern with fixed totals at a hotter 425 F oven.
The tool above takes the cut with weight in pounds or kilos. It returns the roast range, the 145 F plus 3 minute rest rule, and the oven. The default 5 lb bone-in rib gives 1 h 55 min to 2 h 5 min at 325 F.
Times and endpoints follow federal roasting charts with extension temperature tables beside them: 145 F with rest for beef steaks, chops, and roasts against 165 F flat for every part of poultry. The metric mirror of 2.27 kg lands on the same range.
Rest is food safety, not tradition. The thermometer must read 145 F before the roast leaves the oven, and the 3 minute rest finishes the margin while juices settle for carving.
How to use
- Pick pounds or kilos.
- Pick the exact cut; rates differ.
- Type the weight inside the cut band.
- Plan around the high end of the range.
- Pull at 145 F on a thermometer.
- Rest 3 minutes minimum, then carve.
Formula
- min/lb
- Cut rate at 325 F from federal charts.
- 145 F
- Pull temperature for beef roasts.
- 3 min
- Mandatory rest after the pull.
Kilos convert first (x 2.20462) into identical pound math. Tenderloin halves cook shorter than whole charts; weigh into the 4 to 6 lb whole band here.
Worked example
Example: 5 lb rib bone-in
Imperial defaults: 5 lb rib roast bone-in at 325 F.
- Rate: 23 to 25 min per lb.
- Low: 5 x 23 = 115 min, which is 1 h 55 min.
- High: 5 x 25 = 125 min, which is 2 h 5 min.
- Pull: thermometer reads 145 F (63 C).
- Rest: 3 minutes minimum before carving.
- Tool shows the range with 145 F plus rest at 325 F.
Reference table
| Cut | Oven | Timing and endpoint |
|---|---|---|
| Rib bone-in 4-6 lb | 325 F | 23-25 min/lb; 5 lb is 1:55-2:05 |
| Rib boneless 4-6 lb | 325 F | 28-33 min/lb |
| Round/rump 2.5-4 lb | 325 F | 30-35 min/lb; 3 lb is 1:30-1:45 |
| Tenderloin whole 4-6 lb | 425 F | 45-60 min total |
| All beef roasts | Board | 145 F + 3 min rest |
Limits
- Listed cuts and bands only.
- Oven thermostats drift; thermometers rule.
- Convection and dark pans shift browning.
- Rubs and marinades never lower 145 F.
Common mistakes
- Applying poultry 165 F to beef.
- Skipping the 3 minute rest.
- Using bone-in rates on boneless.
- Trusting time over thermometers.
- Carving with the grain.
Try it yourself
Quick checks. Answers sit tucked under each question.
3 lb round roast?
90 to 105 min: 1 h 30 min to 1 h 45 min.
5 lb tenderloin whole?
45 min to 1 h 0 min at 425 F.
Beef safe temp?
145 F (63 C) plus 3 minutes rest.
Questions
5 lb rib roast time?
1 h 55 min to 2 h 5 min bone-in at 325 F.
Safe temp?
145 F with 3 minutes rest, unlike poultry 165 F.
Boneless difference?
Slower: 28 to 33 min per lb.
Tenderloin oven?
425 F with 45 to 60 minute totals.
Round roast rate?
30 to 35 min per lb at 325 F.
Metric match?
Yes: 2.27 kg converts to the same 5 lb range.