Calories in Prawns, Crab, Squid and Oyster per 100 g

By NYUS Inc. · Published 27 October 2026

Prawns, crab, squid and oyster each have a few rows in the food tables, and the dataset behind a number matters. This guide uses two datasets and keeps them apart. The first is IFCT 2017, the Indian Food Composition Tables from ICMR-NIN: ten raw rows from its Table 1, per 100 g, most of them averages of a single region, with the region count shown on every row. The second is the SR Legacy table of USDA FoodData Central: five records, with the piece and cup weights printed on each record page. IFCT 2017 prints energy in kilojoules, so the kcal for those rows are our conversion.

The short answer

By IFCT 2017 Table 1 (raw, per 100 g), the five prawn rows run from 65 to 91 kcal: tiger prawns (orange) 65, tiger prawns (brown) 65, tiger prawns (Macrobrachium) 68, small prawns 71 and big prawns 91. Sea crab is 68 kcal, mud crab 45, black squid 80, red squid 79 and oyster 60. By the SR Legacy records, 4 large raw shrimp (28 g) are about 20 kcal, 3 oz (85 g) of raw squid about 78, 1 cup (118 g) of flaked cooked blue crab about 98 and 6 medium raw oysters (84 g) about 43. Our reading: every row here is between 45 kcal (mud crab, IFCT) and 119 kcal (cooked shrimp, SR Legacy) per 100 g, but the raw and cooked records are different states of the food and are not directly comparable.

IFCT 2017: per 100 g, raw

IFCT 2017, Table 1 (Proximate Principles), per 100 g edible portion. IFCT 2017 says all its data except poultry and egg is for raw food (PDF p. 27), so these are raw rows. "Regions" is how many regions the row averages; a row with 1 region is a single regional composite sample and the other regions are not covered. Energy is IFCT's kJ value; kcal is our conversion at 1 kcal = 4.184 kJ, rounded to the nearest kcal with half rounding up.

The conversions: S008 380 / 4.184 = 90.82, so 91 kcal; S009 297 / 4.184 = 70.98, so 71 kcal; S010 284 / 4.184 = 67.88, so 68 kcal; Q007 273 / 4.184 = 65.25, so 65 kcal; Q008 270 / 4.184 = 64.53, so 65 kcal; Q002 283 / 4.184 = 67.64, so 68 kcal; Q005 190 / 4.184 = 45.41, so 45 kcal; R004 335 / 4.184 = 80.07, so 80 kcal; R006 329 / 4.184 = 78.63, so 79 kcal; Q006 252 / 4.184 = 60.23, so 60 kcal.

SR Legacy: per portion

The SR Legacy table of USDA FoodData Central gives each record's household portions with a gram weight on the record page. Each figure below is our arithmetic: kcal per 100 g times the grams in the portion, divided by 100, rounded to the nearest kcal with half rounding up. Every portion weight is printed on the record page, none is ours. The record names, including "may contain additives to retain moisture", are the dataset's own.

The sums: shrimp raw 71 × 28 / 100 = 19.88, so 20 kcal; shrimp cooked 119 × 22 / 100 = 26.18, so 26 kcal; squid raw 92 × 85 / 100 = 78.2, so 78 kcal; blue crab cooked 83 × 118 / 100 = 97.94, so 98 kcal; oyster raw 51 × 84 / 100 = 42.84, so 43 kcal. Protein, fat and carbohydrate are the same arithmetic on the per 100 g figures, rounded to 0.1 g with half rounding up.

Other portions printed on the SR Legacy records

The same arithmetic on the portions not used above:

The sums: shrimp raw 6 g: 71 × 6 / 100 = 4.26, so 4 kcal; shrimp raw 5 g: 71 × 5 / 100 = 3.55, so 4 kcal; shrimp raw 85 g: 71 × 85 / 100 = 60.35, so 60 kcal; shrimp cooked 85 g: 119 × 85 / 100 = 101.15, so 101 kcal; squid raw 28.35 g: 92 × 28.35 / 100 = 26.082, so 26 kcal; blue crab cooked 85 g: 83 × 85 / 100 = 70.55, so 71 kcal; blue crab cooked 135 g: 83 × 135 / 100 = 112.05, so 112 kcal; blue crab cooked 28.35 g: 83 × 28.35 / 100 = 23.5305, so 24 kcal; oyster raw 248 g: 51 × 248 / 100 = 126.48, so 126 kcal.

What stands out in the numbers

• IFCT per 100 g, raw: mud crab 45 kcal, oyster 60, tiger prawns (orange and brown) 65 and 65, sea crab and tiger prawns (Macrobrachium) 68 and 68, small prawns 71, red and black squid 79 and 80, and big prawns 91.
• Protein per 100 g, IFCT: from 9.51 g (oyster) and 10.00 g (mud crab) to 19.24 g (big prawns), as printed.
• The SR Legacy shrimp records print 71 kcal raw and 119 kcal cooked, moist heat, per 100 g. The record pages print water at 83 g raw and 71.6 g cooked per 100 g. Our reading: these are different states of the food and should not be mixed in one log.
• The IFCT prawn rows differ from each other. Big prawns (S008) print 19.24 g of protein and 380 kJ per 100 g against 14.25 g and 270 kJ for orange tiger prawns (Q008).

Why these are reference rows, not your plate

• Raw rows, no dish. The IFCT rows are raw. The SR Legacy rows are raw or cooked by moist heat, as each record name says. No row here is a prawn curry, a fried prawn, a crab masala or any dish with oil and masala, so this page gives no number for those.
• Single-region rows. Seven of the ten IFCT rows are a single region. The page says so on every row; our existing fish protein guide uses only IFCT rows averaged over 2 or more regions.
• Different names, different species. IFCT 2017 calls its rows prawns and gives a species in brackets; the SR Legacy records are named shrimp, mixed species. This page does not merge them.
• Edible portion. The IFCT figures are per 100 g edible portion, so weigh the cleaned meat, not the shell or head.
• For a packaged product, the pack wins. This page uses no pack labels.

How to log it so the numbers hold

• Log by weight. A 150 g helping of raw squid on the SR Legacy record is 92 × 150 / 100 = 138 kcal by our arithmetic.
• Log oil and masala separately. Our spoon guide gives a level teaspoon of oil or ghee.
• Log the rice or roti separately. Our cooked rice guide gives a cup of cooked rice.
• Do not mix datasets inside one day. If you log a prawn from IFCT, do not switch to an SR Legacy shrimp for the same meal.

Where NYUS fits (our app)

We make NYUS, so read this as ours. NYUS is an AI fitness and nutrition coach in early access on Android, with no ads and no data selling. You log foods yourself by searching 8,900+ Indian and global foods or by barcode, and a weekly check-in adjusts your calories, macros and step goal once enough is logged. Barcode coverage of Indian packaged foods is not complete, so search by name when a scan finds nothing.

What this page leaves out

• A calorie, protein or fat target, and any claim about what these foods do to your weight or health: we have not looked up one for any person, so we give none. If you have a medical condition, ask your doctor or dietitian.
• Any named brand, pack label or FSSAI figure: not used, so the page does not mix label numbers with the records above.
• Prawn curry, fried or masala prawns, crab curry, calamari and other cooked dishes: none is among the ten IFCT rows or five SR Legacy records used, so no number here.
• IFCT rows for lobster, clam, octopus, marine fish and the other freshwater fish: not used here; our fish protein guide covers the fish rows averaged over 2 or more regions.
• Nutrients beyond energy, protein, fat and carbohydrate, including sodium and cholesterol: not covered here.

Sources

• ICMR-NIN, Indian Food Composition Tables 2017 (IFCT 2017), Table 1 (Proximate Principles and Dietary Fibre), PDF pages 67 and 68: rows Q002, Q005, Q006, Q007, Q008, R004 (p. 67) and R006, S008, S009, S010 (p. 68), read 27 Oct 2026; the statement that the data except poultry and egg is for raw food is on PDF p. 27.
• USDA FoodData Central, SR Legacy 174210 (Crustaceans, shrimp, mixed species, raw (may contain additives to retain moisture)): Energy 71 kcal, protein 13.6 g, total fat 1.01 g, carbohydrate 0.91 g per 100 g; portions: 4 large 28 g, 1 medium 6 g, 1 small 5 g, 3 oz 85 g (read 27 Oct 2026).
• USDA FoodData Central, SR Legacy 171971 (Crustaceans, shrimp, mixed species, cooked, moist heat (may contain additives to retain moisture)): Energy 119 kcal, protein 22.8 g, total fat 1.7 g, carbohydrate 1.52 g per 100 g; portions: 3 oz 85 g, 4 large 22 g (read 27 Oct 2026).
• USDA FoodData Central, SR Legacy 174223 (Mollusks, squid, mixed species, raw): Energy 92 kcal, protein 15.6 g, total fat 1.38 g, carbohydrate 3.08 g per 100 g; portions: 1 oz boneless 28.35 g, 3 oz 85 g (read 27 Oct 2026).
• USDA FoodData Central, SR Legacy 174205 (Crustaceans, crab, blue, cooked, moist heat): Energy 83 kcal, protein 17.9 g, total fat 0.74 g, carbohydrate 0 g per 100 g; portions: 1 cup not packed 135 g, 1 cup flaked and pieces 118 g, 1 oz 28.35 g, 3 oz 85 g (read 27 Oct 2026).
• USDA FoodData Central, SR Legacy 171978 (Mollusks, oyster, eastern, wild, raw): Energy 51 kcal, protein 5.71 g, total fat 1.71 g, carbohydrate 2.72 g per 100 g; portions: 1 cup 248 g, 6 medium 84 g (read 27 Oct 2026).
• nyus.in, the NYUS landing page, read on 27 Oct 2026 for the app statements in the NYUS section and the CTA.

The kJ to kcal conversions, the per portion figures, the sums, the rounding, the 150 g example, the comparisons and every sentence starting "Our reading" are NYUS's own arithmetic or opinion, not from IFCT or USDA. The IFCT values in the first table and the SR Legacy portion weights are as printed in those datasets. The names in the first column are the datasets' own row and record names.

Frequently asked questions