Are french fries high in oxalate?
D
Yes. High, 31 mg per 1 medium order
Range 25 to 33 mg across 2 studies, 117 g serving
0 mg50 mg = a day60 mg+
French fries are high in oxalate: about 31 mg per 1 medium order, which is 62% of the 50 mg a day many stone clinics aim for.
If your doctor has put you on a low-oxalate diet, eat it with something high in calcium, like milk, yogurt or cheese. Calcium in the same meal binds oxalate in the gut, so less of it reaches your urine.
Where this number comes from
Each row is one published measurement, converted to a 117 g serving (1 medium order). 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 |
|---|---|---|---|
| 25 mg | 21.7 mg | frozen, prepared | Harvard T.H, 2023 |
| 31 mg | 26.9 mg | Deep fried (n=1) | Hönow R., Hesse A, 2002via Foods 2023;12:3201, Table 5 (CC BY 4.0) |
| 33 mg | 28.6 mg | fast food | Harvard T.H, 2023 |
By Oliver Silen · Data checked November 2, 2026 · Not medical advice