Every 100 kcal of walnuts brings 2.3 g of protein. On that measure it ranks 16th of the 31 nuts in this database and 669th of all 796 foods on the site. Measured by weight instead, its 15.2 g per 100 g ranks 14th in its group.
Only about 9% of the calories in walnuts come from protein, so it is more of an energy food than a protein food. It is worth eating for other reasons; the protein it adds to a day is incidental.
By weight, fat outweighs protein in walnuts: 65.2 g of fat per 100 g against 15.2 g of protein, a ratio of 0.2 to 1.
Set against pine nuts, another nut entry in the database, a serving carries about 0.5 g more protein (pine nuts has 3.8 g per 1 oz).
It is an incomplete protein on its own; pairing it with other plant foods across the day covers the full range of essential amino acids. The serving quoted here is measured by weight at 28 g, and it covers about 9% of the 50 g FDA Daily Value for protein.
Serving sizes
Protein in common portions of walnuts
Protein and calories in Walnuts for 100 g, the site serving and USDA household portions.
Portion
Weight
Protein
Calories
100 g
100 g
15.2 g
654 kcal
1 oz (serving used here)
28 g
4.3 g
183 kcal
1 cup, chopped
117 g
17.8 g
765 kcal
1 cup, ground
80 g
12.2 g
523 kcal
1 cup pieces or chips
120 g
18.2 g
785 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 walnuts
The nine essential amino acids in Walnuts, per 100 g, per serving and per gram of protein.
Amino acid
Per 100 g
Per serving
mg per g protein
leucine
1.17 g
0.33 g
77
lysine
0.424 g
0.12 g
28
valine
0.753 g
0.21 g
50
isoleucine
0.625 g
0.18 g
41
threonine
0.596 g
0.17 g
39
phenylalanine
0.711 g
0.2 g
47
methionine
0.236 g
0.07 g
16
histidine
0.391 g
0.11 g
26
tryptophan
0.17 g
0.05 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.
15.2 g. The 1 oz serving used on this page weighs 28 g and so carries 4.3 g.
How much protein do you get per 100 calories of walnuts?
2.3 g. That figure divides its 15.2 g of protein per 100 g by its 654 kcal per 100 g, so it does not depend on serving size.
Is the protein in walnuts complete?
No. On its own, the protein in walnuts is short of at least one essential amino acid; other protein sources across the day fill the gap.
What share of the protein Daily Value is one serving of walnuts?
About 9%. One 1 oz serving has 4.3 g, and the FDA Daily Value for protein is 50 g.
Figures from USDA FoodData Central record #170187 (Nuts, walnuts, english), 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.