Is celery high in oxalate?
Moderately. Moderate, 12 mg per 1 medium stalk
Range 9.3 to 15 mg across 2 studies, 40 g serving
Lower-oxalate swap: Cucumber, grade A, about <1 mg per 1/2 cup sliced.
Celery has a moderate amount of oxalate: about 12 mg per 1 medium stalk, which is 24% of the 50 mg a day many stone clinics aim for, or 12% of the 100 mg others allow.
50 or 100 mg a day: which target is yours
Why sources disagree on celery
The 2 studies here run from 9.3 to 15 mg per 1 medium stalk, measured between 2007 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 40 g serving (1 medium stalk). 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 |
|---|---|---|---|
| <1 mg soluble only* | 0.5 mg | Raw (n=6) | Santamaria P., Elia A., Serio F., Todaro E, 1999via Foods 2023;12:3201, Table 5 (CC BY 4.0) |
| 9.3 mg | 23.2 mg | Raw | Kim D.-J., Kim H., Kim M., Lee J, 2007via Foods 2023;12:3201, Table 5 (CC BY 4.0) |
| 15 mg | 38 mg | Raw | Harvard T.H, 2023 |
* The study measured soluble oxalate only, which understates the total, so it's shown but doesn't set the grade.
By Oliver Silen · Data checked November 2, 2026 · Not medical advice