Gluten in Foods: ppm Levels & Celiac-Safe Alternatives
Check gluten content (ppm) for common foods and find safe celiac alternatives. Wheat flour: ~30,000 ppm. Barley: ~25,000 ppm. Oats: 100–300 ppm. Legal gluten-free limit: 10 ppm (Argentina) / 20 ppm (FDA/Codex).
See step-by-step calculation
When to use this calculator
- A newly diagnosed celiac checking which basic foods are safe to eat.
- A caregiver or family member preparing food for someone with celiac disease.
- A nutrition student looking up reference gluten levels by food category.
- Someone with suspected gluten sensitivity wanting to identify which grains to eliminate first.
Gluten Thresholds by Regulatory Standard
| Standard / Regulation | Gluten-Free Limit (ppm) | Scope |
|---|---|---|
| Codex Alimentarius — FAO/WHO | 20 ppm | International |
| FDA — Gluten-Free Labeling | 20 ppm | United States |
| Argentina — Resolución Conjunta 32/2023 | 10 ppm | Argentina |
Fuente: Codex Alimentarius (FAO/WHO), FDA, ANMAT/Argentina (2023)
Approximate Gluten Content by Food (ppm) and Celiac Safety
Typical gluten levels in common foods, compared against the legal gluten-free thresholds (10–20 ppm).
| Food | Gluten (ppm) | Celiac-Safe? | Notes |
|---|---|---|---|
| Wheat flour | ~30,000 ppm | No | Main gluten source (gliadins) |
| Barley (grain or malt) | ~25,000 ppm | No | Gluten protein: hordeins |
| Rye | ~25,000 ppm | No | Gluten protein: secalins |
| Oats (conventional, uncertified) | 100–300 ppm | Risk | Cross-contamination during milling |
| Certified gluten-free oats | <10 ppm | Yes | Must carry a certified label |
| Rice (white or brown) | 0 ppm | Yes | Naturally gluten-free |
| Corn / polenta | 0 ppm | Yes | Naturally gluten-free |
| Quinoa | 0 ppm | Yes | Naturally gluten-free |
| Potato / cassava / sweet potato | 0 ppm | Yes | Naturally gluten-free |
| Hard cheese (plain, no additives) | 0 ppm | Yes | Check processed/flavored cheeses |
| Plain yogurt | <10 ppm | Yes | Avoid cereal/granola toppings |
Fuente: food-composition literature and food-safety analysis; thresholds per Codex Alimentarius/FDA (20 ppm) and Argentina Resolución Conjunta 32/2023 (10 ppm). Conversion: 1 ppm = 1 mg gluten per kg of food, so 30,000 ppm = 30 g gluten per kg. Values are typical for the raw food; processed versions may be cross-contaminated — always read labels and look for a certified gluten-free mark.
Gluten-Free Flour Substitutes for Wheat Flour (Baking)
| Gluten-Free Flour | Substitution for Wheat Flour | Best Used For | Needs a Binder (xanthan/guar)? |
|---|---|---|---|
| Certified GF all-purpose blend | 1 : 1 by weight | Almost any recipe (closest drop-in) | Only if the blend has no gum added |
| Rice flour (white/brown) | Part of a blend (~30–40%) | Cakes, cookies, batters, thickening | Yes — gritty and structureless alone |
| Almond flour | Roughly 1 : 1, reduce liquid | Cookies, muffins, dense cakes, crusts | Yes — high fat content, no gluten structure |
| Coconut flour | ≈ 1/4 cup per 1 cup wheat | Dense baked goods, add extra eggs/liquid | Yes — extremely absorbent |
| Tapioca / cassava starch | Starch portion of a blend (~20–40%) | Chewiness, binding, crisp texture | Works as a binder itself in blends |
| Potato starch | Starch portion of a blend (~20–30%) | Lightness and fluffiness in cakes/breads | Pair with a whole-grain GF flour |
| Sorghum flour | ~40–60% with starch | Bread, all-purpose blends (mild flavor) | Yes — combine with starch + gum |
Fuente: gluten-free baking references (King Arthur Baking, gfJules). All listed flours are naturally gluten-free, but buy certified gluten-free versions to rule out cross-contamination. Single gluten-free flours rarely work 1:1 on their own — they lack the elastic gluten network, so most need to be combined and to include a binder such as ~1/4 tsp xanthan or guar gum per cup of flour (plus often extra liquid or an egg). A pre-made certified gluten-free all-purpose blend is the most reliable 1:1 swap.
How it works
Gluten content by food — reference table
These values are based on laboratory analysis and food safety literature:
| Food | Gluten (ppm) | Celiac-safe? | Notes |
|---|---|---|---|
| Wheat flour | ~30,000 ppm | No | Main gluten source (gliadins) |
| Barley | ~25,000 ppm | No | Gluten protein: hordeins |
| Oats (conventional) | 100–300 ppm | Risk | Cross-contamination during milling |
| Certified gluten-free oats | <10 ppm | Yes | Must have certified label |
| Rice (white or brown) | 0 ppm | Yes | Naturally gluten-free |
| Corn / polenta | 0 ppm | Yes | Naturally gluten-free |
| Quinoa | 0 ppm | Yes | Naturally gluten-free |
| Potato / cassava | 0 ppm | Yes | Naturally gluten-free |
| Hard cheese (plain) | 0 ppm | Yes | Check processed cheeses |
| Plain yogurt | <10 ppm | Yes | Avoid brands with cereal toppings |
What is gluten and what is TACC?
Gluten is a group of storage proteins found in certain grains. TACC is the Argentine acronym for the four gluten-containing grains: wheat (Trigo), oats (Avena), barley (Cebada), and rye (Centeno). In people with celiac disease, gluten triggers an autoimmune response that destroys the villi of the small intestine, impairing nutrient absorption.
Legal gluten-free threshold
The Codex Alimentarius (FAO/WHO) and the FDA set the gluten-free limit at 20 ppm (20 mg gluten per kg of food). Argentina's standard (Resolución Conjunta 32/2023) uses a stricter threshold of 10 ppm. Either standard means the food must be tested by an accredited laboratory.
> To convert: 1 ppm = 1 mg gluten per kg of food. 30,000 ppm = 30 g of gluten per kg of wheat flour.
Oats: the special case
Pure oats are naturally gluten-free, but most commercial oats are processed in facilities that also handle wheat or barley, causing cross-contamination of 100 to 300 ppm or more — well above the 20 ppm threshold. People with celiac disease should only eat certified gluten-free oats confirmed to be below 20 ppm (or 10 ppm if following Argentine standards). Check your country's food safety authority for an official list.
Hidden gluten sources
Gluten can hide in: processed meats (wheat-based thickeners), canned soups and broths, flavor packets and spice mixes, candies and sweets, traditional beer (brewed with barley), medications (wheat-based excipients), and foods fried in shared oil with breaded items. Always read ingredient labels carefully.
Disclaimer: This calculator is an informational guide based on typical food composition. Processed foods may contain hidden gluten. Results do not replace consultation with a gastroenterologist or registered dietitian. Celiac diagnosis requires antibody tests (anti-tTG IgA) and intestinal biopsy.
Example: Is barley safe for celiacs?
Frequently asked questions
How much gluten is in wheat flour?
What is the legal gluten-free threshold?
Is oatmeal gluten-free for celiacs?
Are rice, corn, and quinoa safe for celiacs?
What is TACC?
What are common hidden sources of gluten?
What symptoms does celiac disease cause?
How is celiac disease diagnosed?
Are dairy products (cheese, yogurt) safe for celiacs?
What happens if a celiac accidentally eats gluten?
Sources & references
Methodology & trust
Calculadora de salud revisada por el equipo editorial de Hacé Cuentas, contrastada con Codex Alimentarius — Standard for Gluten-Free Foods (FAO/WHO), según nuestra política editorial y metodología.
Última revisión: June 22, 2026. Los parámetros se verifican periódicamente con las fuentes citadas.
Calculations run 100% in your browser. We do not store or transmit your data.
Indicative results. For critical decisions, consult a professional.
Rodríguez, M. (2026). Gluten in Foods: ppm Levels & Celiac-Safe Alternatives. Hacé Cuentas. https://hacecuentas.com/celiac-gluten-free-tacc-foods
Contenido bajo licencia CC-BY 4.0 — reutilizable citando la fuente con enlace a Hacé Cuentas.