Protein content
2.7 g of protein in 1 cup (156 g) of boiled potatoes, or 2 g for every 100 kcal it supplies.
Share of this food's calories that come from protein - it is more of an energy food than a protein food.
| Protein per 100 kcal | 2 g |
|---|---|
| Protein per 100 g | 1.71 g |
| Protein per serving | 2.7 g in 1 cup (156 g) |
| Calories from protein | 8% |
| Leucine per serving | 0.16 g |
| Rank in vegetables, per 100 kcal | 90th of 105 |
| Rank of all foods, per 100 g | 691st of 796 |
| Share of 50 g Daily Value | 5% per serving |
| Protein quality | Incomplete protein |
One 1 cup, 2.7 g protein.
Every 100 kcal of boiled potatoes brings 2 g of protein. On that measure it ranks 90th of the 105 vegetables in this database and 698th of all 796 foods on the site. Measured by weight instead, its 1.71 g per 100 g ranks 59th in its group.
Only about 8% of the calories in boiled potatoes 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.
USDA lists 0.1 g of fat per 100 g of boiled potatoes, too little for a protein-to-fat ratio to mean much.
Set against carrot juice, another vegetable entry in the database, a serving carries about 0.5 g more protein (carrot juice has 2.2 g per 1 cup).
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 volume at 156 g, and it covers about 5% of the 50 g FDA Daily Value for protein.
Serving sizes
| Portion | Weight | Protein | Calories |
|---|---|---|---|
| 100 g | 100 g | 1.71 g | 86 kcal |
| 1 cup (serving used here) | 156 g | 2.7 g | 134 kcal |
| 0.5 cup | 78 g | 1.3 g | 67 kcal |
| 1 large (3" to 4-1/4" dia.) | 300 g | 5.1 g | 258 kcal |
| 1 medium (2-1/4" to 3-1/4" dia.) | 167 g | 2.9 g | 144 kcal |
| 1 small (1-3/4" to 2-1/2" dia.) | 125 g | 2.1 g | 108 kcal |
Portion weights are the household measures listed on the USDA record; protein and calories scale from the per-100 g figures.
Amino acids
| Amino acid | Per 100 g | Per serving | mg per g protein |
|---|---|---|---|
| leucine | 0.103 g | 0.16 g | 60 |
| lysine | 0.104 g | 0.16 g | 61 |
| valine | 0.096 g | 0.15 g | 56 |
| isoleucine | 0.07 g | 0.11 g | 41 |
| threonine | 0.062 g | 0.1 g | 36 |
| phenylalanine | 0.076 g | 0.12 g | 44 |
| methionine | 0.027 g | 0.04 g | 16 |
| histidine | 0.038 g | 0.06 g | 22 |
| tryptophan | 0.027 g | 0.04 g | 16 |
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.
Related
Highest-protein vegetables per serving · Most protein-dense foods · Highest protein per 100 g
Quick answers
1.71 g. The 1 cup serving used on this page weighs 156 g and so carries 2.7 g.
2 g. That figure divides its 1.71 g of protein per 100 g by its 86 kcal per 100 g, so it does not depend on serving size.
No. On its own, the protein in boiled potatoes is short of at least one essential amino acid; other protein sources across the day fill the gap.
About 5%. One 1 cup serving has 2.7 g, and the FDA Daily Value for protein is 50 g.
Figures from USDA FoodData Central record #170440 (Potatoes, boiled, cooked without skin, flesh, without salt), 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.