Is tomato high in oxalate?
C
Moderately. Moderate, 10 mg per 1 medium tomato
Range 9.5 to 14 mg across 3 studies, 123 g serving
0 mg50 mg = a day60 mg+
Tomato has a moderate amount of oxalate: about 10 mg per 1 medium tomato, which is 20% of the 50 mg a day many stone clinics aim for, or 10% of the 100 mg others allow.
50 or 100 mg a day: which target is yours
Why sources disagree on tomato
The 3 studies here run from 9.5 to 14 mg per 1 medium tomato, measured between 2002 and 2023. Variety, growing conditions and lab method all move the number.
Where this number comes from
Each row is one published measurement, converted to a 123 g serving (1 medium tomato). 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 |
|---|---|---|---|
| 9.5 mg | 7.75 mg | Raw | Harvard T.H, 2023 |
| 10 mg | 8.5 mg | Raw (n=3) | Hönow R., Hesse A, 2002via Foods 2023;12:3201, Table 5 (CC BY 4.0) |
| 14 mg | 11 mg | Raw (n=3) | Judprasong K., Charoenkiatkul S., Sungpuag P., Vasanachitt K., Nakjamanong Y, 2006via Foods 2023;12:3201, Table 5 (CC BY 4.0) |
By Oliver Silen · Data checked November 2, 2026 · Not medical advice