Ribeye
Ribeye is a premium beef steak cut from the rib primal between the 6th and 12th ribs of the carcass. It is the most heavily marbled common cut and serves as the quality-grading reference muscle in every major regional system: USDA Prime/Choice/Select grades, Japanese A5 BMS scoring, AUS-MEAT marbling, and Korean KAPE 1++/1+ classification are all assessed at the ribeye between the 12th and 13th ribs.
Ribeye is a premium beef steak cut from the rib primal between the 6th and 12th ribs of the carcass. It is the most heavily marbled common cut and serves as the quality-grading reference muscle in every major regional system: USDA Prime/Choice/Select grades, Japanese A5 BMS scoring, AUS-MEAT marbling, and Korean KAPE 1++/1+ classification are all assessed at the ribeye between the 12th and 13th ribs.
The ribeye comes from the longissimus dorsi muscle, which sits along the back of the steer and does relatively little load-bearing work. Less work means more intramuscular fat and a finer grain, the two factors that drive eating quality. That is why every major beef-grading body in the world uses the ribeye as the visual reference cross-section for assessing the entire carcass.
On a steak case, ribeye sells under several names. American butchers call the bone-in version a "rib steak" and reserve "ribeye" for the boneless version, but the names are used interchangeably day-to-day. In Australia and New Zealand the boneless cut is "scotch fillet"; export trade calls it "cube roll". In France it is "entrecôte". In Latin America "ojo de bife" is the same muscle. Same anatomy, different label, same grading reference.
Also known as: Rib steak, Scotch fillet (Australia/NZ), Cube roll, Entrecôte (France), Costilla / ojo de bife (LatAm).
What good quality looks like
- Dense, web-like marbling, fine intramuscular fat distributed evenly through the lean rather than clumped in chunks
- A bright cherry-red lean color (or pink-white at very high BMS scores)
- A thick fat cap on the outer rim, white and firm, not yellow or oily
- A noticeable "spinalis dorsi" cap on the upper edge of the cut, a separate small muscle widely considered the best-eating part of the ribeye
- Fine-grained lean texture; coarse, loose texture indicates older or lower-grade beef
How to cook it
- Best cooked over high direct heat: grill, cast-iron sear, or broil. Medium-rare to medium internal temperature (54-60°C / 130-140°F) maximizes the marbling render
- Rest for at least 5 minutes after cooking, the marbling redistributes and the lean re-absorbs juices
- For very high marbling (USDA Prime, BMS 7+, KAPE 1++), reduce cook temperature and time; the cut renders fat fast and over-cooks easily
- Reverse-sear (low oven then hot pan) produces the most even doneness on thick-cut ribeyes (over 1.5 inches / 4 cm)
Frequently asked
What is the difference between ribeye and rib steak?
In American butchery, "rib steak" is the bone-in version and "ribeye" is the boneless version of the same cut. Outside the US the names are usually used interchangeably. The muscle is identical; only the bone presence differs.
What grade is the best ribeye?
Under USDA, Prime ribeye has the most marbling. The Japanese BMS scale extends well above USDA Prime. A5 BMS 8 to 12 represents marbling far denser than USDA Prime. For most consumers, USDA Prime or BMS 5+ ribeye delivers premium eating quality without paying for the extreme top of the BMS scale.
What is a tomahawk steak?
A tomahawk is a ribeye with the entire long rib bone left attached and frenched (bone scraped clean). It is the same muscle as a ribeye, the bone is for presentation. The eating quality depends on the grade of the underlying ribeye, not the bone.
What is the spinalis on a ribeye?
The spinalis dorsi is a small muscle that runs along the upper edge of the ribeye, separated from the main eye by a strip of fat. It is widely considered the best-eating part of the ribeye, denser marbling, finer grain, more flavor, and many butchers will cut it out and sell it separately as "ribeye cap" or "deckle".
How can I tell if a ribeye is high quality from a photo?
Look for fine, evenly-distributed marbling (white flecks throughout the lean rather than clumped), a bright cherry-red lean color, a clean white fat cap, and a visible spinalis cap on the upper edge. MeatGrader analyzes these factors automatically and returns the inferred regional grade.