The quick answer
Marbling is the fine fat inside the muscle. As it warms, it adds juiciness, tenderness and richness. A higher SB score means more visible marbling, but the best score is the one that matches your preferred flavour, portion and occasion.
Your steak journey
Learn. Choose. Cook.
Inside the steak
What Marbling Actually Does
Marbling is intramuscular fat. It sits within the muscle, not around the outside edge.
Flavour
Rendered fat carries aroma and creates a rounder, richer finish.
Juiciness
The fat softens with heat and helps the steak feel succulent.
Tenderness
Fine marbling can create a softer bite and more luxurious mouthfeel.
Read the label
The SB Scale at a Glance
The higher the number, the more visible marbling. The experience moves from beef forward to intensely rich.
Lean and Clean
Traditional beef flavour, a firmer bite and less richness.
Balanced and Rich
Tender, juicy and versatile enough for a premium steak night.
Luxurious and Intense
A softer, buttery and deeply rich experience that rewards restraint.
Butcher note: marble score describes marbling, not the whole steak. Cut, thickness and cooking temperature still shape the final result.
Higher is not automatically better
Match the Score to the Moment
Behind the score
How Marbling Develops
Marbling is not created by one thing. It develops through a combination of potential and careful production.
Genetics
Breed and bloodline influence the animal's potential to develop fine intramuscular fat.
Nutrition
A carefully managed feeding program supports consistent marbling development.
Time
Marbling develops gradually, so finishing time and management matter.
Do not convert blindly
Three Scales. Three Different Labels.
Peter Augustus product labels use the SB scale. AUS-MEAT and Japanese BMS are separate grading references.
| System | Range | Where you will see it | What to remember |
|---|---|---|---|
| Peter Augustus SB | 0 to 10 | Peter Augustus and Stanbroke product labels | Use this guide when shopping the range |
| AUS-MEAT | 0 to 9+ | Australian industry grading | This is the scale discussed in the older marbling article |
| Japanese BMS | 1 to 12 | Japanese beef grading | A BMS number is not a direct SB conversion |
Simple rule: compare steaks within the scale printed on the label. Do not assume the same number means the same grade in another system.
You know the number
Now Choose It. Then Cook It.
Continue with the guide that answers your next question.
Best Wagyu Cuts for First Time Buyers
Use four simple profiles to choose rump, sirloin, rib fillet or Tomahawk with confidence.
Choose your first WagyuHow to Cook Steak by Marble Score
Compare heat, seasoning, serving size and method for SB 2, SB 5 and SB 10.
Cook your scoreKeep learning
Three Useful Next Reads
Quick clarity
Marble Score FAQs
Is a higher marble score always better?
No. Higher scores are richer and softer, but a lower score can deliver stronger traditional beef flavour, a larger portion and a cleaner finish.
Does marble score tell me which cut to buy?
Not by itself. Marble score describes the marbling. The cut still changes flavour, tenderness, size and cooking style. Use the first time Wagyu guide to compare rump, sirloin, rib fillet and Tomahawk.
Is SB the same as Japanese BMS?
No. The systems use different ranges and assessment frameworks. Treat comparisons as a guide to richness, not a direct number for number conversion.
Does a higher score mean a longer cooking time?
No. Thickness and internal temperature matter more than score alone. Highly marbled steak often needs simpler seasoning, controlled heat and a shorter finish.
Your number. Your steak.
Choose the Experience You Want.
Start with the score, choose the cut, then cook it with confidence.
