Frozen Prawn Count Malaysia — 31/40 vs 51/60 Is Not the Same Bag

Frozen prawn bags in Malaysia are sold by count grade — how many prawns make a pound. 31/40 means larger pieces than 51/60. A cheaper 51/60 bag is not a bargain 31/40; it cooks into a different dish. Chasing “udang 1 kg” without the count compares two animals that share a freezer and nothing else.

This page treats count + prep as the product identity — not a cooking class or a health claim.

Count grade is the product — start there

Dish you have in mind	Count band to lock	Why
Stir-fry, fried rice, omelette	51/60 or 61/70 often enough	Smaller pieces spread through the wok
Prawn mee, soup, one-prawn bites	31/40 or 26/30	You paid for size you can see
Grill or butter prawn “show” pieces	16/20 / 21/25 if the bay has them	Count is the luxury; kg will look dear
You only care about minced / chopped	Small count, peeled	Do not buy 31/40 to chop it
Flyer says “udang promo” with no count	Walk on until the print appears	No count = no compare

Head-on, headless, peeled, and vannamei vs tiger are extra axes. Lock count + prep before price.

Catalogue prices are indicative. Confirm count print, net kg, and till on the bag.

How Malaysian freezer aisles label prawns

The useful print is a pair: 31/40, 41/50, 51/60, 61/70, sometimes 16/20 or 21/25. That pair is prawns per pound. Lower numbers = larger prawns. The bag may also say udang, vannamei, tiger, head on, HLSO, peeled, or PD.

Count is the line. 31/40 and 51/60 can share a brand and a 1 kg claim and still be as different as Grade A eggs and omega eggs. A promo that swaps count is a different dish.

Prep is the second line. Head-on includes heads you may not eat. Headless shell-on is a peeling job. Peeled is convenience and a different RM/kg. Do not rank peeled 31/40 against head-on 31/40.

Species. Vannamei is the common supermarket whiteleg. If the title changes to tiger or another name, split the compare.

Glaze. Water ice is not prawn. Prefer net or drained weight when printed. A glossy 1 kg that shrinks in the colander was priced as water.

Search with the count if you know it: udang · prawn 31/40 · frozen prawn

Count bands compared, not mixed

Factor	31/40 (larger)	51/60 (smaller)	Peeled, any count
Piece size	Fewer, bigger	More, smaller	Depends on count printed
Fair unit	RM / kg inside 31/40	RM / kg inside 51/60	RM / kg inside that peeled count
Typical use	Soup, grill, “see the prawn”	Fried rice, sambal, mixed dishes	When you will not peel
Promo trick	Relabelled as “udang 1 kg”	Sold as the “cheap” 31/40	Looks dear until you skip peeling time
Bulk risk	One bag; prawns hate a second thaw	Same	Same

If a card does not show a count, do not award it Best value in your head. Open the listing, read the title, or skip it.

Illustrative RM-per-kg inside one count

Unit = bag RM ÷ net kg (same count, same prep).

Worked grid — illustrative only, not a shelf quote:

Bag (illustrative)	Count + prep	Sticker	Net kg	RM / kg
Brand A	31/40, headless	RM 38.00	1.00	RM 38.00
Brand B	31/40, headless	RM 34.50	0.90	RM 38.33
Brand A	51/60, headless	RM 28.00	1.00	RM 28.00
Brand C	31/40, peeled	RM 45.00	0.80	RM 56.25

Brand B’s “cheaper” 31/40 loses once you divide 0.90 kg. 51/60 at RM 28 / kg is not a 31/40 deal. Peeled 31/40 lives on a third ladder. Never celebrate a “cheap kg” until count and prep match last week’s bag.

Choose a count for the dish, then the store

1. “Last bag was 31/40 and the dish was right”

Search 31/40. Stay there. A 51/60 flyer is a different recipe, not a saving.

2. “I cook fried rice twice a week”

Lock a smaller count you already like. Convert RM/kg inside that band. One bag in the plan.

3. “I hate peeling”

Buy peeled at that count. Compare peeled to peeled.

4. “The 1 kg bag looks huge”

Prawns punish a second defrost. A smaller net bag at a worse sticker can still be the adult choice. Bulk mistakes apply in the freezer.

5. “Can I hop stores for udang only?”

Only if My plan already has other lines there, or you pass the door.

Search this week's udang bags on Priceory

Flip the last bag and copy the count pair and the prep (head-on / headless / peeled).
Search udang with Best value first. Add the count in the query if the bay is noisy.
Keep only cards inside that count band + prep. Drop 51/60 when you wrote 31/40.
Convert RM per kg on net weight. Ignore “1 kg” in the title if the fine print is 800 g.
Use Compare stores for the matched pack. Lowest is same-pack, not same-ocean.
Put one bag in My plan · weekly. If chicken or vegetables already justify a second shop, prawns can ride. Alone, they usually should not.
On the chest, read count, net, glaze, frost. Confirm the till.

Method: How to compare grocery prices · Matching.

Glaze and swap traps on prawn bags

Trap	Fix
“1 kg” glaze-heavy bag	Prefer net / drained weight
Promo swaps 31/40 for 51/60	Count is the SKU — walk away
Peeled vs shell-on on one chart	Split the compare
Tiger vs vannamei mashed together	Different title, different ladder
Two bags “for the month”	One thaw plan; prawns do not like a second freeze
Marketplace odd packs with emoji titles	Verify weight and count; online is optional

Frozen prawn count questions

What does 31/40 actually mean?

It is a count grade: about 31 to 40 prawns per pound. 51/60 means more prawns per pound, so each piece is smaller. Fried rice with 51/60 is fine. Calling it a 31/40 promo is not.

Should I always buy the largest count I can afford?

No. Large count is a dish choice. If you chop prawns into sambal, you paid for size you destroyed. Lock the count the recipe uses, then jimat inside that band.

How do I compare peeled and shell-on?

You mostly should not. The clean method is peeled 31/40 vs peeled 31/40.

Why is a 900 g bag “cheaper” than a 1 kg bag?

Divide. RM 34.50 ÷ 0.90 kg can lose to RM 38.00 ÷ 1.00 kg. Titles love round kilos.

Do I need a second store for prawns?

Rarely. Keep prawns on the route you already take. Jimat playbook.

Related guides

Lock the count, then chase the kilo

Write the count pair and prep from the last bag. Compare RM per kg only inside that identity. One bag in the plan. Confirm print and till on the chest.

Illustrative numbers and catalogue cards are indicative. Confirm count, net weight, and till in store. Corrections: [email protected] · Editorial standards.