How much phosphorus is in walnuts?

98 milligrams of phosphorus in 1 ounce (14 halves)

Phosphorus in other portions of walnuts
Portion	Phosphorus
1 cup, chopped	405 milligrams of phosphorus in 1 cup, chopped
1 cup, ground	277 milligrams of phosphorus in 1 cup, ground
1 cup, in shell, edible yield (7 nuts)	97 milligrams of phosphorus in 1 cup, in shell, edible yield (7 nuts)
1 cup shelled (50 halves)	346 milligrams of phosphorus in 1 cup shelled (50 halves)
1 cup pieces or chips	415 milligrams of phosphorus in 1 cup pieces or chips
100 g	346 milligrams of phosphorus in 100 g

See everything in a serving of Walnuts

Where these numbers come from

USDA FoodData Central, SR Legacy, record 170187. The source describes it as: Nuts, walnuts, english.

U.S. Department of Agriculture, Agricultural Research Service, Beltsville Human Nutrition Research Center. FoodData Central. [Internet]. [cited 11 October 2026]. Available from https://fdc.nal.usda.gov/. Releases used: Foundation Foods, April 2026; SR Legacy, April 2018; Survey Foods (FNDDS 2021-2023), October 2024.

Data built on 11 October 2026 (data-2026-10-11).