Is coffee high in oxalate?
A
No. Very low, 1.5 mg per 1 cup brewed
Range 1.4 to 1.7 mg across 2 studies, 240 g serving
0 mg50 mg = a day60 mg+
Coffee is low in oxalate: about 1.5 mg per 1 cup brewed, which is 3% of the 50 mg a day many stone clinics aim for, or 2% of the 100 mg others allow.
50 or 100 mg a day: which target is yours
Why sources disagree on coffee
Coffee measured 1.4 to 1.7 mg a cup in two labs, near zero per cup. Large cohort studies link drinking coffee with fewer stones.
Where this number comes from
Each row is one published measurement, converted to a 240 g serving (1 cup brewed). 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 |
|---|---|---|---|
| 1.4 mg | 0.6 mg | filtered | Siener R, 2021 |
| 1.7 mg | 0.72 mg | brewed | Harvard T.H, 2023 |
By Oliver Silen · Data checked November 2, 2026 · Not medical advice