Size is the first thing experienced buyers ask about, and for good reason. Mud crab sizes decide which dishes you can serve, what you can charge, and how much margin you keep. A 350g crab and a 900g crab are practically different products. They suit different customers, different menus, and different price points. This live mud crab size guide walks through every grade from 300g to over 1kg, explains what each one is best for, and shows you how to make sure every shipment matches the grade you paid for.
Why Every Buyer Needs a Live Mud Crab Size Guide
In live seafood, size is shorthand for value. Larger crabs generally carry more meat per kilo of shell, present better on the plate, and command higher prices. But bigger is not automatically better for your business. A hawker stall selling chilli crab at fifteen dollars cannot use the same crab as a fine-dining restaurant charging eighty. Choosing the right size grade is really about matching the crab to your customer and your menu economics. Get it right and your food cost stays predictable. Get it wrong and you either overpay for size your customers do not need, or serve portions that disappoint.
The 300 to 350g Grade, the Retail Workhorse
This is the smallest commercial grade and the most affordable per kilo. Crabs in this range suit wet-market sellers, neighborhood seafood stalls, and home cooks who want real mud crab flavor without the premium price. The meat yield per crab is modest, so this grade works best for dishes where the crab is cut into pieces and the sauce does heavy lifting. Think budget-friendly chilli crab sets or crab bee hoon. For buyers, the key check at this size is fullness. Small crabs vary more in meat content, so buy from a supplier who grades honestly and rejects light, empty-feeling crabs before packing.
The 400g Grade, the Sweet Spot for Value
The 400g crab hits a balance many buyers love. It is substantial enough for a satisfying single serving, yet still priced within reach of mid-range menus. Restaurants serving individual crab dishes, catering portions, and family-style sets use this grade heavily. Because it sits in the middle of the range, the 400g grade also tends to have the most stable supply. If you are a new buyer figuring out your demand, this is a sensible grade to start with. You get presentable crabs, manageable cost, and flexibility across several dishes.
The 500 to 600g Grade, the Restaurant Standard
This is the classic restaurant crab. At half a kilo and above, you get generous claws, a full body of meat, and the kind of plate presence that justifies premium menu prices. Most serious chilli crab and black pepper crab programs in Singapore build their signature dish around this grade, because every crab looks impressive and portions stay consistent from table to table. Expect to pay meaningfully more per kilo than the smaller grades. The trade-off is worth it when your reputation depends on the dish. For this grade, verify that the supplier weighs individually. A box labeled 500 to 600g should not hide a cluster of 450g crabs.
The 700 to 900g Grade, the Premium Statement
Crabs in this range are for occasions. Banquet caterers, high-end restaurants, and festive-season menus use them when the crab itself is the centerpiece. The meat is abundant, the claws are dramatic, and customers happily pay top dollar. Supply is naturally tighter at this size because fewer crabs in any catch reach these weights, so prices move more with season and availability. If you sell at this tier, lock in your supply relationship early and confirm availability before promising it on your menu. Running out mid-festival is worse than never offering it.
The 1kg Plus Grade, the Showpiece
A mud crab over one kilo is a trophy. These giants go to luxury dining, corporate events, and customers who want the biggest crab in the room. Per-kilo prices are the highest in the range, and rightly so. Each crab is hand-selected, because at this size every individual matters. When buying showpiece crabs, insist on per-crab weighing and photos before packing. You are paying for certainty, and a professional supplier will provide it without being asked.
How Size Affects the Price You Pay
Pricing follows a clear pattern. Smaller grades cost less per kilo, larger grades cost more, and the jump is not linear. The step from 400g to 600g might add a moderate premium, while the step to one kilo plus can double the per-kilo rate or more. Seasonality also plays a role. Certain sizes become scarce at different times of year, which pushes their price up faster than the rest of the range. This is why a transparent per-grade price list matters so much. It lets you plan your menu around grades that are available and fairly priced right now, instead of discovering the cost after you have already promised the dish.
How to Verify Size Consistency in Every Shipment
Trust, then verify. Every shipment, weigh a random sample of at least ten percent of the crabs. Compare the average against the grade you ordered and note how many fall outside the stated range. A tolerance of around ten percent in either direction is normal for live product. Much more than that, and the grading is sloppy or dishonest. Take photos of your sample on the scale and share them with your supplier. Good suppliers welcome this feedback because it helps them tighten their own process. If a supplier resists verification or disputes your scale, treat it as a red flag. Consistent grading is one of the clearest signs of a professional operation, and it is entirely reasonable to demand it.
Frequently Asked Questions
What is the most popular mud crab size for restaurants in Singapore?
The 500 to 600g grade. It gives generous portions, consistent plating, and strong perceived value for signature dishes like chilli crab and black pepper crab. Most restaurant programs standardize on this range.
Does a bigger crab always mean more meat?
Generally yes, but fullness matters as much as size. A heavy, active 500g crab can carry more meat than a light, lethargic 700g one. Always judge by weight in the hand and liveliness, not by shell width alone.
Why do prices differ so much between size grades?
Larger crabs are scarcer, take longer to grow, and deliver better meat yield and presentation. The market pays a premium for that combination, and the premium grows steeply at the top end of the range.
Can I mix size grades in one order?
Yes, and many buyers do. Retailers and wet-market sellers often take a spread of grades to serve different customers. Just make sure each grade is packed and priced separately so you can verify what you received.
How should I store different sizes after delivery?
The rules are the same for all grades. Keep crabs cool and damp, never submerged in freshwater, and cook them as soon as practical. Larger crabs stay lively a bit longer, but none of them improve with waiting.
Get Our Wholesale Price List on WhatsApp
Now you know exactly which grade fits your menu and your margin. Tell us your target size and weekly volume, and we will quote you per-kilo prices for every grade from 300g to over 1kg. Start a WhatsApp chat for our wholesale price list and ask about a trial order. We grade by individual weighing, so the sizes you order are the sizes that arrive.
