Is apple high in oxalate?
A
No. Very low, 1.8 mg per 1 medium apple
Range <1 to 6.4 mg across 2 studies, 182 g serving
0 mg50 mg = a day60 mg+
Apple is low in oxalate: about 1.8 mg per 1 medium apple, which is 4% 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 182 g serving (1 medium apple). 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* | 0.4 mg | Cox Kent, raw (n=26) | Hönow R., Hesse A, 2002via Foods 2023;12:3201, Table 5 (CC BY 4.0) |
| <1 mg | 0.38 mg | Raw | Harvard T.H, 2023 |
| 1.8 mg | 1 mg | Cox Kent, raw (n=28) | Hönow R., Hesse A, 2002via Foods 2023;12:3201, Table 5 (CC BY 4.0) |
| 6.4 mg | 3.5 mg | Granny Smith, raw (n=1) | Hönow R., Hesse A, 2002via Foods 2023;12:3201, Table 5 (CC BY 4.0) |
* 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