Lamb cooking time calculator
Enter the weight of your lamb for the roasting time: a leg roasted pink or well done, or a shoulder slow roasted until it falls apart.
Leg of lamb cooking times
At 180°C (160°C fan), 350°F: pink 25 minutes per 450 g (1 lb) plus 25 minutes; well done 30 minutes per 450 g plus 30 minutes. The same applies to a half leg.
| Weight | Pink | Well done |
|---|---|---|
| 1 kg (2.2 lb) | 1 h 20 min | 1 h 35 min |
| 1.5 kg (3.3 lb) | 1 h 50 min | 2 h 10 min |
| 2 kg (4.4 lb) | 2 h 15 min | 2 h 45 min |
| 2.5 kg (5.5 lb) | 2 h 45 min | 3 h 15 min |
| 3 kg (6.6 lb) | 3 h 10 min | 3 h 50 min |
Slow-roast shoulder of lamb
Roast a shoulder covered at 160°C (140°C fan), 325°F, for about 4 hours for a 2 kg shoulder, plus 30 minutes for each extra kg. Take the foil off for the last 30 minutes. It’s ready when the meat pulls away from the bone with a fork.
| Weight | Cooking time |
|---|---|
| 1.5 kg (3.3 lb) | 4 h |
| 2 kg (4.4 lb) | 4 h |
| 2.5 kg (5.5 lb) | 4 h 15 min |
| 3 kg (6.6 lb) | 4 h 30 min |
Rest lamb for 20 minutes before carving.
Questions
How long to cook a 2 kg leg of lamb?
2 h 15 min for pink at 180°C (160°C fan), or 2 h 45 min for well done.
What temperature is lamb cooked to?
Take it out at 60°C (140°F) for pink, or 70°C (160°F) for well done. It rises a few degrees as it rests.
How long does a shoulder of lamb take to slow cook?
About 4 hours for 2 kg at 160°C (140°C fan), covered with foil.
Times are a guide: ovens and joints vary. Always check meat with a thermometer before serving. FeastFlow’s times come from British Turkey, AHDB and USDA guidance, last checked 9 November 2026.