Every method for judging meat without a thermometer is a proxy. Poking it and comparing to the ball of your thumb, timing per 500 g, cutting it open to look: all of them are guesses about one number, the temperature in the middle. A probe thermometer measures that number directly, costs about the same as one wasted rib joint, and turns the most stressful part of cooking into reading a display. Here are the temperatures worth knowing, and the two effects (resting and carryover) that trip people up even with a thermometer in hand.
Whole-muscle beef and lamb: doneness is a preference
A steak or a joint is sterile on the inside; any bacteria live on the surface, which gets seared far past any temperature they survive. So for whole cuts of beef and lamb, the internal temperature is about how you like it, not safety. Temperatures below are the reading at the centre when you take it off the heat, before resting:
| Doneness | °C | °F | What you get |
|---|---|---|---|
| Rare | 50 to 52°C | 122 to 126°F | Cool red centre, very soft |
| Medium rare | 54 to 57°C | 129 to 135°F | Warm red-pink centre, the classic |
| Medium | 60 to 63°C | 140 to 145°F | Pink throughout, firmer |
| Medium well | 65 to 68°C | 149 to 154°F | Trace of pink |
| Well done | 70°C+ | 158°F+ | No pink, dry, your funeral |
The same numbers apply to lamb chops, racks and roast legs. For big roasting joints, remember carryover (below) and pull 3 to 5°C earlier than the table.
Slow-cooked cuts are a different game entirely. Brisket, shin, lamb shoulder and anything else full of connective tissue is deliberately taken far past well done, to 90°C or so over hours, because that is where collagen melts into gelatine. Tenderness there comes from time at temperature, not from stopping early.
Pork: the rules changed
Older books insist pork must be cooked grey to the bone, a habit from the era of trichinosis. Modern guidance for whole cuts of pork (chops, loin, tenderloin) is 63°C (145°F) followed by a 3-minute rest, which leaves the meat slightly blush pink and dramatically juicier than the pork of anyone’s childhood. Pink pork at 63°C is not undercooked pork; it is correctly cooked pork that looks unfamiliar. Ribs, shoulder and belly, like beef brisket, want the long ride to 85 to 90°C for tenderness.
Chicken and poultry: 74°C, no negotiation on safety
Poultry is the exception to “surface only”. Salmonella and campylobacter can be present through the meat, so poultry has a genuine safety temperature: 74°C (165°F) at the thickest part is the standard instant-kill figure for chicken, turkey and duck legs. For a whole bird, probe the thickest part of the thigh without touching bone; the thigh lags the breast.
Two honest refinements. First, food safety is a function of temperature and time: 74°C kills salmonella instantly, but lower temperatures held longer do the same job, which is how sous-vide chicken at 60°C is safe. Cooking a chicken breast to 62 to 65°C and holding it there is legitimate technique, but it needs actual temperature control, not optimism. If you are not deliberately doing time-at-temperature cooking, use 74°C. Second, duck breast is commonly served pink at 57 to 60°C; that is a widely accepted chef’s practice with a small residual risk, not an official recommendation. Know which trade you are making.
Mince: always well done
Mincing takes surface bacteria and distributes them through the meat, so the “sterile interior” logic collapses. Burgers, meatballs, sausages and all minced meat should reach 71°C (160°F) for beef, lamb and pork mince, and 74°C (165°F) for chicken or turkey mince, in the centre. A rare burger from supermarket mince is not the same bet as a rare steak, whatever the gastropub menu implies. Restaurants serving pink burgers are doing it under controls (whole cuts minced in-house, tight time and temperature) that a domestic kitchen does not replicate.
Colour, by the way, is a liar in both directions: mince can brown before reaching a safe temperature, and safely cooked meat can stay pink near a bone or from smoke. The probe is the only witness worth trusting.
Fish, for completeness
White fish flakes and is done around 55 to 60°C. Salmon is at its best around 50 to 52°C, translucent and silky, and officially recommended at 63°C, which is firm. Same trade-off as duck: know which you are choosing, and buy accordingly.
Carryover cooking: why you stop early
Meat keeps cooking after it leaves the heat. The outer layers are hotter than the centre, and that heat keeps flowing inward while it rests. How much the centre climbs depends on size and cooking temperature:
- A steak or chop: 2 to 3°C rise.
- A medium roasting joint: 4 to 6°C.
- A large joint or whole turkey from a hot oven: up to 8°C or more.
So pull the meat before the target and let carryover finish the job. For a medium-rare roast rib aiming at 56°C, come out of the oven at about 50 to 52°C. This is the single most common way people overshoot with a thermometer: the number was right at the hob, and wrong ten minutes later at the table. Gentler cooking methods (low ovens, sous-vide) produce less carryover because there is less stored surplus heat in the outer layers.
Resting
Resting is the second half of carryover and worth doing in its own right. Straight off the heat, the juices in meat are thin and mobile, and a knife releases them onto the board. Rested, the meat relaxes and the juices thicken and redistribute, so they stay in the slice. Give a steak 5 minutes and a joint 15 to 30 minutes, loosely covered with foil. Loosely matters: wrap it tight and the crust you worked for steams soft. A rested joint is barely cooler than a fresh one at the centre, and the meat is measurably juicier.
Using the probe properly
Cheap instant-read probes are accurate enough; a fold-out digital one for under £15 will change your cooking more than any pan you own. Probe the thickest part, keep the tip away from bone (bone conducts heat and reads high) and away from the pan surface, and take two or three readings in different spots on a big joint. Check the probe’s honesty occasionally in iced water (should read 0°C) or boiling water (100°C at sea level). And remember your oven dial is only loosely connected to reality anyway, as covered in the oven temperature conversions article, which is one more reason to measure the meat, not the oven. If dinner has already gone past done, the rescue guide has the damage-limitation options.
Takeaway: probe the centre, pull early for carryover, rest before carving. Food safety note: 74°C for poultry, 71°C for mince and 63°C plus rest for whole pork are the standard safety figures; anything served below them is a personal risk decision, and one you should not make for guests who are pregnant, elderly, very young or immunocompromised.