How the Japanese Wagyu Grading System Works
Every Japanese wagyu carcass is graded by the Japan Meat Grading Association (JMGA) immediately after slaughter. Grading is mandatory, independent, and conducted by certified assessors. The result is recorded on an official certificate that accompanies every export shipment.
The system evaluates each carcass on two independent axes — yield and quality — and the combination of the two produces the final grade that appears on every export certificate.
Yield Grade (A, B, C)
Yield grade measures how much usable meat is obtained from the carcass relative to its total weight. It is calculated using a formula based on rib eye area, subcutaneous fat thickness, and cold carcass weight.
| Yield Grade | Yield % | Export relevance |
|---|---|---|
| A | 72%+ | Virtually all export wagyu is grade A |
| B | 69–72% | Occasionally exported at discount |
| C | Below 69% | Domestic use only |
Quality Grade (1–5)
Quality grade is assessed across four criteria. The lowest score across all four determines the final quality grade — meaning a carcass must excel in every category to achieve grade 5.
| Criterion | What Is Assessed | Scale |
|---|---|---|
| Marbling (BMS) | Intramuscular fat degree | 1–12 |
| Beef Colour (BCS) | Colour and brightness of meat | 1–7 |
| Fat Colour (BFS) | Colour and quality of fat | 1–7 |
| Firmness & Texture | Grain and firmness of meat | 1–5 |
The BMS Scale — Beef Marbling Standard
BMS is the single most important number on a wagyu grading certificate for most buyers. It is the primary driver of price and the most visible quality indicator when a cut is sliced open.
| BMS | Grade | Description | Price vs BMS 5 |
|---|---|---|---|
| 10–12 | A5 top | Exceptional — fat almost equals lean | +150–200% |
| 8–9 | A5 | Outstanding — intense visible marbling | +80–120% |
| 5–7 | A4 | Excellent — rich marbling, steakhouse standard | Base reference |
Buyer note: BMS score alone does not determine the final grade. A carcass with BMS 10 but poor fat colour will not achieve A5. Always read the full grading certificate, not just the BMS number.
A5 Wagyu — What It Means for Buyers
A5 is the highest achievable grade in the JMGA system. It requires a BMS score of 8 or above AND excellence across all three remaining quality criteria simultaneously. Only approximately 15% of Japanese Black cattle reach A5 grade — making it structurally scarce regardless of demand.
For importers, A5 is the prestige product. It commands the highest retail margins, appears on fine dining and tasting menus, and drives the most consumer recognition. However, it also requires the most rigorous authentication — A5 grading certificates are among the most frequently counterfeited documents in international wagyu trade.
A5 Price Reference (FOB Japan, Frozen)
| Cut | FOB Price (USD/kg) | Best Channel |
|---|---|---|
| Tenderloin | $145–265 | Tasting menu, omakase |
| Ribeye | $125–200 | Premium steakhouse |
| Striploin | $120–190 | Fine dining, premium retail |
| Chuck Roll | $85–130 | Premium shabu-shabu |
A4 Wagyu — The Volume Grade for Importers
A4 is the most commercially important grade in the Japanese wagyu export market. It requires BMS 5–7 and strong scores across all quality criteria — delivering the marbling intensity that clearly differentiates Japanese wagyu from Australian alternatives, at a price point 35–50% below A5.
Most Michelin-starred restaurants outside Japan use A4 as their standard grade, reserving A5 for premium tasting menu courses only. For distributors building a hotel and restaurant supply programme, A4 is typically the anchor grade.
A4 Price Reference (FOB Japan, Frozen)
| Cut | FOB Price (USD/kg) | Best Channel |
|---|---|---|
| Tenderloin | $95–150 | Fine dining, hotels |
| Ribeye | $70–110 | Steakhouses, premium retail |
| Striploin | $67–107 | Steakhouses, retail |
| Chuck Roll | $33–53 | Shabu-shabu, food service |
How to Verify Wagyu Grade When Importing
Grade fraud is a documented problem in international wagyu trade. Lower-grade product is misrepresented as A5, Australian wagyu is sold as Japanese, and certificates are forged. For importers, verification is a non-negotiable part of the sourcing process.
What to Check on a JMGA Certificate
- Individual carcass number — every graded animal has a unique ID traceable in the JMGA database
- Yield grade — should be A for all export-quality product
- Quality grade — 4 or 5 for premium export product
- BMS score — should match the grade (A5 = BMS 8+)
- Date of grading — should align with slaughter and processing dates
- JMGA assessor stamp — official seal of the grading association
Red flag: any supplier unable or unwilling to provide the original JMGA certificate with carcass number. Photocopies without traceable IDs should be treated as unverifiable.
Every order from IMEXPORTA includes the original JMGA grading certificate with individual carcass number. Full traceability from farm to shipment.
Request Wholesale Price List →Japanese vs Australian Wagyu Grading
Australian wagyu uses a different grading system — the MSA Marble Score (MS) — which runs from 0 to 9+. The two systems are not directly equivalent, but the following mapping is widely used in international trade:
| Japanese Grade | BMS | Australian MS (approx.) | Price difference |
|---|---|---|---|
| A5 | 8–12 | MS 9+ | Japanese 30–50% higher |
| A4 | 5–7 | MS 6–8 | Japanese 25–40% higher |
For distributors, Japanese and Australian wagyu serve complementary roles. Japanese A4/A5 anchors the premium end of the range; Australian MS6–8 fills volume mid-tier. The critical point is accurate labelling — the two should never be mixed under a single "wagyu" designation.
What Is Wagyu? Full Breed & Origin Guide →Frequently Asked Questions
What does A5 wagyu mean?
A5 is the highest grade in Japan's JMGA system. A refers to yield grade and 5 is the highest quality grade, requiring BMS 8–12 and excellence across all four quality criteria simultaneously.
What is the difference between A5 and A4 wagyu?
A5 requires BMS 8–12, A4 requires BMS 5–7. A5 trades at 40–70% premium over A4 for the same cut. Most Michelin-starred restaurants outside Japan use A4 as their standard grade.
What is BMS in wagyu?
BMS stands for Beef Marbling Standard, a 12-point scale by the JMGA measuring intramuscular fat. BMS 1 is the minimum and BMS 12 is the theoretical maximum. BMS 8+ is required for A5 grade.
How do I verify wagyu grade when importing?
Request the original JMGA grading certificate with individual carcass number. Check yield grade (A), quality grade (4 or 5), BMS score, date of grading, and JMGA assessor stamp. Any supplier unable to provide this should be treated with caution.
What is the difference between Japanese and Australian wagyu grading?
Japanese wagyu uses JMGA with BMS 1–12 and grades A1–A5. Australian wagyu uses MSA Marble Score 0–9+. MS9+ roughly corresponds to Japanese A5, MS6–8 to A4. Japanese product commands a 25–50% premium at equivalent grades.