Lamb Roasting Time Calculator
How long to roast lamb
As a guide, lamb takes about 50 minutes per kg for medium, 60 minutes per kg for well done, plus around 20 minutes on top, cooked at 190°C (fan 170°C, gas mark 5). Enter your joint's weight above and the calculator does the arithmetic. A leg or shoulder benefits from a good rest. Aim for 60°C internal for medium.
Weight-based timings are a starting point, not a guarantee: oven calibration, whether the meat went in fridge-cold, and the shape of the joint all matter. The only reliable test is a meat thermometer in the thickest part, away from bone. Convert your oven dial with the oven temperature and gas mark converter.
Frequently asked questions
Is the lamb roasting time converter free?
Yes. It is completely free, with no sign-up and nothing to install. It runs entirely in your browser.
Are these figures exact?
They are reliable guides based on standard UK values, but ingredients, ovens and appliances vary. For anything involving meat, always check it is cooked through with a thermometer rather than relying on time alone.