Beef · Grading

Wagyu Grading: What A5 and BMS Actually Mean

What A5 certifies, what it doesn't, and why you should ask for the BMS.

A5 is the top grade in Japan's beef grading system. The letter is the yield grade — how much saleable meat came off the carcass. The number is the quality grade, 1 to 5. Marbling is scored separately on the BMS scale, 1 to 12, and A5 covers BMS 8 through 12.

In one line

The letter is yield, the number is quality, and the number that actually predicts richness is the BMS.

Buy it if

You are paying Japanese Wagyu prices and want to know exactly what the label is promising.

Japanese beef grading does two unrelated jobs at once, which is why the label confuses people.

The letter is a yield grade. A, B or C describe cutability — how much saleable meat the carcass gave against a reference standard. A is above standard, B is standard, C is below. This is a butcher's number. It tells you nothing about how the steak eats.

The number is a quality grade. It runs 1 to 5 and is set by four sub-scores: marbling, meat color and brightness, firmness and texture, and fat color and quality. The final grade is the lowest of the four, not an average — so one weak score caps the whole carcass.

The number under the number

Marbling is scored on the Beef Marbling Standard, BMS 1 to 12, read on the cut face between the sixth and seventh rib. Quality grade 5 starts at BMS 8 and runs to 12. That single band covers most of the price range in the market, which is why serious sellers quote the BMS as well as the grade.

For comparison, USDA Prime is usually mapped to somewhere around BMS 4 to 5. The top half of the Japanese scale has no American equivalent.

How to buy it

Ask for the BMS, not just the grade.
Buy less than you think. Three to four ounces per person is a portion; twelve is a dare.
Cook it hot and fast on a dry surface, salt only, and rest it briefly. Fat this soft does not need help.

At a glance

Who grades it	The Japan Meat Grading Association (JMGA), carcass by carcass
Yield grade	A (above standard), B (standard), C (below standard)
Quality grade	1 to 5, set by the lowest of four sub-scores
The four sub-scores	Marbling, meat color and brightness, firmness and texture, fat color and quality
Marbling scale	BMS 1 to 12, read on the cut face between the 6th and 7th rib
A5 marbling range	BMS 8 to 12
Serving size	3 to 4 oz per person, not a 12 oz steak

Also called

A5 JMGA grading BMS Beef Marbling Standard

The scale

How it is graded

A5	Top yield grade and top quality grade. Covers BMS 8 to 12, so two A5 steaks can be meaningfully different — the grade is a band, not a point.
A4	Quality grade 4, BMS 5 to 7. Still far richer than anything on the American scale, and easier to eat in a normal portion.
A3	Quality grade 3, BMS 3 to 4. The entry point for graded Wagyu.
B and C	Yield grades below A. They describe how much meat the carcass gave, not how it eats — a B5 is graded 5 on quality just like an A5.
BMS 1 to 12	The marbling scale itself. Quality grade 5 starts at BMS 8, so sellers who want to distinguish the top of the range quote the BMS number directly.

Myths

What people get wrong

A5 is a single standard of quality.

A5 spans BMS 8 through 12. That is the widest band in the whole system, and it is the band where the price differences live. If the seller can tell you the BMS, ask.

The A stands for grade-A quality.

The A is a yield grade. It describes cutability — how much saleable meat came off the carcass — and says nothing about flavor or marbling.

A5 means Kobe.

Kobe is a regional brand: Tajima-strain Japanese Black raised in Hyōgo Prefecture under that program's rules. Grade and brand are separate. Almost all A5 is not Kobe.

A5 tells you the animal was raised well.

Grading is a measurement taken on the carcass. Husbandry, prefecture and feed program are separate claims that the grade does not cover.

Compare

Wagyu Grading: What A5 and BMS Actually Mean vs USDA Prime

The two scales barely overlap. USDA Prime is commonly mapped to around BMS 4 to 5, which means the top half of the Japanese marbling scale has no American equivalent at all. A5 is not 'a better Prime' — it is a different eating experience at a different portion size.

	Wagyu Grading: What A5 and BMS Actually Mean	USDA Prime
Top grade	A5 (quality 5, BMS 8–12)	Prime
Marbling scale	BMS 1–12	Six marbling degrees, from Practically Devoid to Abundant
What sets the grade	The lowest of four sub-scores	Marbling plus carcass maturity
Who pays for grading	Built into the Japanese carcass market	The packer, voluntarily
Typical portion	3–4 oz	8–16 oz

How Crowd Cow sources it

Our Japanese Wagyu comes from prefecture programs — Kagoshima, Miyazaki, Iwate, Hokkaido and Shinshu — plus Olive Wagyu from Kagawa, and Kobe beef from Hyōgo when we can get it. Each arrives with its grade, and we publish the grade on the product rather than folding everything into the word 'Wagyu'.

Questions

Common questions

Is A5 always better than A4?

It is graded higher, and it is fattier. Whether it is better depends on how you are eating it. A4 holds up to a full steak portion; A5 is usually best sliced thin, seared hard and shared. Plenty of people who have eaten both order A4 for dinner.

Why isn't the BMS on every label?

The consumer-facing grade is the A5 / A4 / A3 shorthand, and BMS is a sub-score inside it. Sellers who are buying at the top of the range tend to publish it because it is the only way to show the difference between BMS 8 and BMS 12.

Does the grade tell me where the beef came from?

No. Prefecture programs — Miyazaki, Kagoshima, Hokkaido, Shinshu — and brand programs like Kobe are separate from the grade. A carcass carries both, and they mean different things.

What is the fat melting point about?

Wagyu fat is softer than commodity beef fat and starts to soften near hand temperature, which is why a slice looks glossy the moment it hits a warm plate and why the meat reads as rich rather than greasy.