A5 vs A4 Wagyu: What's the Difference and Which Should You Order?
A detailed breakdown of Japan's beef grading system — JMGA grades, BMS marbling scores, taste differences, and which grade works best for your restaurant.
How Japanese Beef Grading Works
The Japanese Meat Grading Association (JMGA) evaluates every carcass on two axes: yield grade (A, B, or C) and quality grade (1 through 5). The yield grade reflects the proportion of usable meat — Grade A means above-average yield. The quality grade is determined by the lowest score across four criteria: marbling (BMS), meat color and brightness, firmness and texture, and fat color and quality. An A5 carcass has the highest yield and the highest quality across all four criteria. An A4 carcass has the same excellent yield but scores one tier lower on at least one quality criterion.
BMS: The Marbling Scale That Matters Most
Of the four quality criteria, marbling — measured on the Beef Marbling Standard (BMS) scale from 1 to 12 — is what most buyers focus on. A5 grade requires a BMS score of 8–12, while A4 requires BMS 5–7. The difference is visible to the naked eye: A5 beef at BMS 10+ has an almost snow-white appearance from the dense web of intramuscular fat, while A4 at BMS 6 shows distinct marbling but with more red meat visible between the fat streaks. Both are exceptional by any international standard — even A4 Japanese wagyu surpasses the marbling of USDA Prime beef.
Taste and Texture Differences
A5 wagyu, particularly at BMS 10–12, delivers an intensely rich, buttery experience. The fat melts at a lower temperature than body heat, creating the famous 'melt-in-your-mouth' sensation. The flavor is deeply umami-forward with a sweetness that lingers. A4 wagyu offers a more balanced experience — still remarkably tender and well-marbled, but with a firmer bite and a stronger beef flavor that isn't overwhelmed by fat. Many experienced chefs actually prefer A4 for certain preparations, as the slightly lower fat content allows the natural beef character to shine through.
Pricing Differences
A5 commands a significant premium over A4 — typically 30–60% more depending on the cut and specific BMS score. Within A5, there's further stratification: a BMS 12 ribeye might cost twice as much as a BMS 8 ribeye, even though both technically qualify as A5. For restaurants, this pricing gap directly impacts menu economics. A5 wagyu needs to be positioned as an ultra-premium offering ($100+ per portion), while A4 can work at a more accessible price point ($60–90 per portion) while still delivering an extraordinary dining experience.
Which Grade Works Best for Different Restaurants
For high-end omakase, teppanyaki, or Michelin-level tasting menus where wagyu is served in small portions (30–60g), A5 BMS 10+ is the right choice. The intense richness works in small doses and justifies ultra-premium pricing. For steakhouses, yakiniku restaurants, or fine dining establishments serving larger portions (100–150g), A4 is often the smarter choice. The lower fat content makes it more enjoyable in larger quantities without overwhelming the palate. Many of the world's top wagyu restaurants actually serve A4 for their main course cuts and reserve A5 for tasting portions.
A4 as a Strategic Advantage
There's a common misconception that A4 is somehow 'second tier.' In reality, A4 Japanese wagyu is still among the finest beef in the world — it simply offers a different balance of flavor and texture. For restaurants looking to introduce Japanese wagyu to their menu without committing to the highest price tier, A4 provides an excellent entry point. The lower wholesale cost means better margins, and many diners who are new to wagyu actually prefer the more balanced fat-to-meat ratio of A4 over the intense richness of A5.
Our Recommendation
Rather than choosing exclusively one grade, consider stocking both. Use A5 (BMS 10+) for premium tasting courses, special omakase items, or signature dishes served in small portions. Use A4 (BMS 5–7) for larger-format steak offerings, shabu-shabu, or sukiyaki where guests consume more volume. This dual approach lets you capture different price points on your menu while offering an authentic Japanese wagyu experience across your entire dining program. When sourcing, look for a supplier who can provide both grades with consistent quality — ideally from the same region for flavor consistency.
Need help choosing the right grade and cuts for your menu? Contact us for a consultation — we'll recommend the optimal product mix for your restaurant.
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