Are lentils high in oxalate?
No. Low, 6.6 mg per 1/4 cup dry (about 1/2 cup cooked)
Range 6.4 to 12 mg across 2 studies, 48 g serving
Lentils are low in oxalate: about 6.6 mg per 1/4 cup dry (about 1/2 cup cooked), which is 13% of the 50 mg a day many stone clinics aim for, or 7% of the 100 mg others allow.
50 or 100 mg a day: which target is yours
Why sources disagree on lentils
The 2 studies here run from 6.4 to 12 mg per 1/4 cup dry (about 1/2 cup cooked), measured between 2002 and 2021. They tested 3 preparations, and growing conditions, variety and lab method all move the number.
Where this number comes from
Each row is one published measurement, converted to a 48 g serving (1/4 cup dry (about 1/2 cup 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 |
|---|---|---|---|
| 6.4 mg | 13.3 mg | Dried (n=1) | Hönow R., Hesse A, 2002via Foods 2023;12:3201, Table 5 (CC BY 4.0) |
| 6.6 mg | 13.8 mg | Red, seeds, dry (n=2) | Siener R., Seidler A., Hönow R, 2021via Foods 2023;12:3201, Table 5 (CC BY 4.0) |
| 12 mg | 24 mg | Brown, seeds, dry (n=2) | Siener R., Seidler A., Hönow R, 2021via Foods 2023;12:3201, Table 5 (CC BY 4.0) |
By Oliver Silen · Data checked November 2, 2026 · Not medical advice