A typical 1 cup sliced serving of jicama contains 0.9 grams of protein (0.72 g per 100 g), which makes it only a minor source of protein. That covers roughly 2% of the 50 g reference Daily Value, so it adds toward your protein total for the day.
Only about 8% of the calories in jicama 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.
Among the 105 vegetables in the database, jicama ranks 82nd by protein per serving, and 738th out of all 796 foods on the site. Set against red bell pepper, another vegetable entry in the database, a serving carries about 0.6 g less protein (red bell pepper has 1.5 g per 1 cup chopped).
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 above is measured by volume at 120 g. The per-100 g figure lets you compare it directly against any other food here, whatever its serving.
Source: USDA FoodData Central #170073 - "Yambean (jicama), raw" (SR Legacy, published 4/1/2019). Values are the published reference figures for that record, not lab measurements for a specific brand or batch.
Quick answers
Jicama protein FAQ
How much protein is in jicama per 100 g?
Jicama has 0.72 g of protein per 100 g. A typical 1 cup sliced serving (120 g) provides 0.9 g.
Is jicama a complete protein?
No. Jicama is an incomplete protein on its own; pairing it with other protein sources across the day covers the full range of essential amino acids.
How much of the Daily Value does a serving of jicama cover?
A 1 cup sliced serving of jicama contains 0.9 g of protein, about 2% of the 50 g reference Daily Value.
Is jicama a good source of protein?
Jicama is only a minor source of protein, and about 8% of its calories come from protein, which makes it more of an energy food than a protein food. Set against red bell pepper, another vegetable entry in the database, a serving carries about 0.6 g less protein (red bell pepper has 1.5 g per 1 cup chopped).