Is fish high in oxalate?
A
No. Very low, <1 mg per 3 oz cooked
Range 0 to 1.3 mg across 1 study, 85 g serving
0 mg50 mg = a day60 mg+
Fish is low in oxalate: about <1 mg per 3 oz cooked, which is 0% 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 85 g serving (3 oz cooked). 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 |
|---|---|---|---|
| 0 mg | 0 mg | cod, Atlantic, dry heat cooked | Harvard T.H, 2023 |
| <1 mg | 0.26 mg | salmon, sockeye, dry heat cooked | Harvard T.H, 2023 |
| 1.3 mg | 1.5 mg | tuna, light, canned in water | Harvard T.H, 2023 |
By Oliver Silen · Data checked November 2, 2026 · Not medical advice