Is popcorn high in oxalate?
A
No. Very low, 4.9 mg per 3 cups popped
One study at 4.9 mg, 33 g serving
0 mg50 mg = a day60 mg+
Popcorn is low in oxalate: about 4.9 mg per 3 cups popped, which is 10% of the 50 mg a day many stone clinics aim for, or 5% of the 100 mg others allow.
50 or 100 mg a day: which target is yours
Where this number comes from
Each row is one published measurement, converted to a 33 g serving (3 cups popped). 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 |
|---|---|---|---|
| 4.9 mg | 14.85 mg | Microwave or ready to eat | Harvard T.H, 2023 |
By Oliver Silen · Data checked November 2, 2026 · Not medical advice