Is whole wheat bread high in oxalate?
C
Moderately. Moderate, 14 mg per 1 slice
One study at 14 mg, 32 g serving
0 mg50 mg = a day60 mg+
Lower-oxalate swap: White bread, grade A, about 4.4 mg per 1 slice.
Whole wheat bread has a moderate amount of oxalate: about 14 mg per 1 slice, which is 28% of the 50 mg a day many stone clinics aim for, or 14% of the 100 mg others allow.
50 or 100 mg a day: which target is yours
Where this number comes from
Each row is one published measurement, converted to a 32 g serving (1 slice). 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 |
|---|---|---|---|
| 14 mg | 42.5 mg | Bread | Harvard T.H, 2023 |
By Oliver Silen · Data checked November 2, 2026 · Not medical advice