🟢 Safe
Oxalate <25 mg/serving
Oxalate <25 mg/serving
🟡 Caution
Oxalate 25-99 mg/serving
Oxalate 25-99 mg/serving
🔴 Avoid
Oxalate ≥100 mg/serving
Oxalate ≥100 mg/serving
Content reviewed by OxalateWatch Editorial Team. Based on Harvard T.H. Chan SPH oxalate data (2024) and NKF/AUA dietary guidelines.
📊 Nutrition at a Glance
12 mg
Oxalate / serving
Low Oxalate
0 mg
Sodium / 100g
Low Na
8.4 g
Protein / 100g
Tier 1
32 mg
Calcium / 100g
Tier 1
📏 Oxalate by Serving Size
| Serving | Weight | Oxalate | Verdict |
|---|---|---|---|
| 1/4 cup | 32 g | 12 mg | Safe |
| 2 x 1/4 cup | 64 g | 24 mg | Safe |
| ½ x 1/4 cup | 16 g | 6 mg | Safe |
🏷️ Tags
🟢 See all Grains & Pasta rated Safe for kidney stones →
🔗 Related Foods
🟢 Safe alternatives (recommended)
⚠️ Other foods in this category to watch
❓ Frequently Asked Questions
Is Flour safe for kidney stones?
Yep, you're good. Flour clocks in at 12 mg oxalate per 1/4 cup — way under the 25 mg cutoff. Eat it without the stress. Measured by Harvard, not guessed.
What's the oxalate content of Flour?
12 mg — that's the oxalate in a standard 1/4 cup of Flour. For the 100g comparison freaks: 38 mg. Source is Harvard's 2024 food analysis project.
Is Flour high in oxalates?
It's low. 12 mg per 1/4 cup is well under the 25 mg danger line. Flour is not the food you need to worry about.
What are the best low-oxalate alternatives to Flour?
Plenty of options. Scroll down to Related Foods — every 🟢 green item there is a lower-oxalate alternative to Flour. Same food group, way less oxalate.
How much sodium does Flour have?
0 mg sodium per 100g in Flour. Well under the 460 mg threshold. One less thing on your kidney stone checklist.
🔍 Explore More About This Food
See our detailed safety analysis for this food
Exact oxalate numbers: how much is in a serving
Low, moderate, or high oxalate? Full breakdown
How much sodium? Kidney stone risk check
📚 Data Sources
Oxalate: Harvard T.H. Chan School of Public Health (2024) via OHF. Nutrition: USDA FoodData Central (SR Legacy 2018 & Foundation Foods).
📖 Key Scientific References
Taylor EN, Curhan GC. Oxalate intake and the risk for nephrolithiasis. J Am Soc Nephrol. 2007;18(7):2198-2204. PMID: 17538185
Borghi L, Schianchi T, Meschi T, et al. Comparison of two diets for the prevention of recurrent stones in idiopathic hypercalciuria. N Engl J Med. 2002;346(2):77-84. DOI: 10.1056/NEJMoa010369
Fink HA, Akornor JW, Garimella PS, et al. Diet, fluid, or supplements for secondary prevention of nephrolithiasis. Eur Urol. 2009;56(1):72-80. DOI: 10.1016/j.eururo.2009.03.031
Ferraro PM, Taylor EN, Gambaro G, Curhan GC. Dietary and lifestyle factors for primary prevention of nephrolithiasis. BMC Nephrol. 2020;21(1):267. PMID: 32652950
Pearle MS, Goldfarb DS, Assimos DG, et al. Medical management of kidney stones: AUA guideline. J Urol. 2014;192(2):316-324. DOI: 10.1016/j.juro.2014.05.006
Liebman M, Costa G. Effects of calcium and magnesium on urinary oxalate excretion after oxalate loads. J Urol. 2000;163(5):1565-1569. PMID: 10751889
Holmes RP, Assimos DG. The impact of dietary oxalate on kidney stone formation. Urol Res. 2004;32(5):311-316. DOI: 10.1007/s00240-004-0437-3
Lin BB, Lin ME, Huang RH, et al. Dietary treatment and fluid intake for prevention of recurrent calcium stones. PLoS One. 2021;16(4):e0250257. PMID: 33872340
This is dietary reference information, NOT medical advice. Talk to your doctor or a registered dietitian before changing your diet. Oxalate tolerance varies by person, stone type, and medication.