Are mashed potatoes high in oxalate?
C
Moderately. Moderate, 12 mg per 1 cup
Range 12 to 12 mg across 1 study, 210 g serving
0 mg50 mg = a day60 mg+
Lower-oxalate swap: Cauliflower, grade A, about 2.8 mg per 1/2 cup cooked.
Mashed potatoes have a moderate amount of oxalate: about 12 mg per 1 cup, which is 24% of the 50 mg a day many stone clinics aim for.
Where this number comes from
Each row is one published measurement, converted to a 210 g serving (1 cup). The grade and the range use the rows prepared the way the serving is eaten, and take the middle. How the grades work.
| Per serving | Per 100 g | Preparation | Source |
|---|---|---|---|
| 12 mg | 5.52 mg | Mashed | Harvard T.H, 2023 |
By Oliver Silen · Data checked November 2, 2026 · Not medical advice