Every 100 kcal of prime rib brings 6.5 g of protein. On that measure it ranks 116th of the 133 meats in this database and 380th of all 796 foods on the site. Measured by weight instead, its 23 g per 100 g ranks 98th in its group.
Around 26% of the calories in prime rib come from protein, so it is moderately protein-dense. It contributes to a day's protein total, but the bulk of what it delivers is energy rather than amino acids - treat it as a contributor alongside a denser source, not as the protein in a meal.
By weight, fat outweighs protein in prime rib: 28.5 g of fat per 100 g against 23 g of protein, a ratio of 0.8 to 1.
Set against sweetbreads, another meat entry in the database, a serving carries about 0.5 g more protein (sweetbreads has 19.1 g per 3 oz cooked).
It is a complete protein - it supplies all nine essential amino acids in adequate amounts, so it can carry a meal's protein on its own. The serving quoted here is measured by weight at 85 g, and it covers about 39% of the 50 g FDA Daily Value for protein.
Sold with its fat cap intact, so it delivers noticeably less protein per ounce than a trimmed round cut.
Serving sizes
Protein in common portions of prime rib
Protein and calories in Prime rib for 100 g, the site serving and USDA household portions.
Portion
Weight
Protein
Calories
100 g
100 g
23 g
355 kcal
3 oz cooked (serving used here)
85 g
19.6 g
302 kcal
1 piece, cooked, excluding refuse (yield from 1 lb raw meat with refuse)
292 g
67.2 g
1037 kcal
Portion weights are the household measures listed on the USDA record; protein and calories scale from the per-100 g figures.
Amino acids
Essential amino acids in prime rib
The nine essential amino acids in Prime rib, per 100 g, per serving and per gram of protein.
Amino acid
Per 100 g
Per serving
mg per g protein
leucine
1.82 g
1.55 g
79
lysine
1.91 g
1.62 g
83
valine
1.12 g
0.95 g
49
isoleucine
1.03 g
0.88 g
45
threonine
1 g
0.85 g
43
phenylalanine
0.898 g
0.76 g
39
methionine
0.589 g
0.5 g
26
histidine
0.788 g
0.67 g
34
tryptophan
0.258 g
0.22 g
11
Per-100 g values are the amino acid analysis on the USDA record. The serving and per-gram-of-protein columns are arithmetic on those values; they are not a protein quality score.
SampleWhat goal trends look like after a week
109 g
Average per logged day
4 of 7
Days goal met
71%
Complete-protein share
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Sample figures for one made-up week against a 110 g goal, not your data. Red bars met the goal. Your own log fills this in with Premium.
Related
Other meats by protein per calorie
Swap for more protein per calorie
Bacon - 6.5 g per 100 kcal, 5.7 g per 2 slices cooked
Pork belly - 6.6 g per 100 kcal, 22.6 g per 3 oz cooked
Beef tongue - 6.8 g per 100 kcal, 16.4 g per 3 oz cooked
23 g. The 3 oz cooked serving used on this page weighs 85 g and so carries 19.6 g.
How much protein do you get per 100 calories of prime rib?
6.5 g. That figure divides its 23 g of protein per 100 g by its 355 kcal per 100 g, so it does not depend on serving size.
Is the protein in prime rib complete?
Yes. The protein in prime rib supplies all nine essential amino acids in adequate amounts, so it can carry a meal's protein on its own.
What share of the protein Daily Value is one serving of prime rib?
About 39%. One 3 oz cooked serving has 19.6 g, and the FDA Daily Value for protein is 50 g.
Figures from USDA FoodData Central record #168682 (Beef, rib, large end (ribs 6-9), separable lean and fat, trimmed to 1/8" fat, all grades, cooked, roasted), SR Legacy data. USDA data is in the public domain. Values are the published reference figures for that record, not lab measurements for a specific brand or batch.