Among wheat-based flours, pastry flour has the least gluten, with a protein content of just 8 to 9 percent. Cake flour comes in close at 7 to 10 percent. If you’re looking to avoid gluten entirely, dozens of naturally gluten-free flours exist, made from grains, nuts, and seeds that never contained gluten in the first place.
The answer depends on whether you want less gluten or zero gluten, and those are very different goals with different solutions.
Wheat Flours Ranked by Gluten Content
All wheat flour contains gluten. It’s the protein network that forms when wheat flour meets water, and it’s what gives bread its chew and structure. But not all wheat flours contain the same amount. The protein percentage on the bag is your best proxy for gluten content, since roughly 75 to 85 percent of wheat protein is gluten.
Here’s how common wheat flours stack up:
- Pastry flour: 8 to 9% protein. The lowest-gluten wheat flour widely available.
- Cake flour: 7 to 10% protein. Finely milled from soft wheat, with a silky texture.
- All-purpose flour: about 11.7% protein. The middle ground.
- Bread flour: about 12.7% protein. Designed to build strong gluten networks for chewy loaves.
You can estimate the protein percentage yourself from the nutrition label. Divide the grams of protein per serving by the serving size in grams, then multiply by 100. A bag listing 4 grams of protein per 30-gram serving works out to roughly 13% protein.
Why Low-Gluten Wheat Flour Matters for Baking
Soft, low-protein wheats produce tender, delicate baked goods. That’s why cake flour and pastry flour are the go-to choices for biscuits, scones, pie crusts, cookies, and quick breads. The less gluten that forms, the less structure and chew you get, which is exactly what you want in a flaky pastry or a crumbly cookie.
Bread flour does the opposite. Its high protein content builds the elastic gluten network that traps gas bubbles and gives yeast bread its rise and chew. Using bread flour in a pie crust would make it tough. Using cake flour in a sandwich loaf would make it collapse.
If your goal is simply a more tender bake, switching from all-purpose to pastry or cake flour will get you there. But if your goal is avoiding gluten for health reasons, even the softest wheat flour still contains far too much gluten for anyone with celiac disease or a serious sensitivity.
Flours With Zero Gluten
Plenty of flours contain no gluten at all because they’re made from plants that aren’t wheat, rye, or barley. The most common options include almond flour, coconut flour, rice flour, oat flour, buckwheat flour, corn flour, tapioca flour, sorghum flour, millet flour, teff flour, amaranth flour, quinoa flour, and various bean flours like chickpea.
Despite the name, buckwheat is not related to wheat. It’s a seed, and it’s naturally gluten-free. Same goes for oat flour, though oats are frequently processed in facilities that also handle wheat, so cross-contamination is a real concern (more on that below).
Each of these flours behaves differently in recipes. Rice flour and tapioca flour are relatively neutral and starchy, making them popular bases in gluten-free baking blends. Almond and coconut flour add fat and density, which works well in some recipes but can make others heavy. Bean flours like chickpea bring a significant protein boost. Most gluten-free bakers use a blend of two or three flours to approximate the texture that wheat gluten would normally provide.
Nutritional Trade-offs to Know About
Switching to gluten-free flours isn’t a straightforward nutritional swap. Research comparing gluten-free and gluten-containing flours found that gluten-free cereal flours average about 3.6 grams of fiber per 100 grams, compared to 7.1 grams in their wheat-based counterparts. They also tend to contain more fat and more moisture.
There are notable exceptions. Amaranth flour packs roughly 11.6 grams of fiber per 100 grams, and chickpea flour comes in around 10.9 grams. Both outperform even whole wheat flour on fiber. Sorghum flour, on the other hand, sits at the bottom with barely any fiber at all (about 0.36 grams per 100 grams). So if you’re choosing a gluten-free flour and fiber matters to you, pseudocereal and legume flours are the strongest picks.
Cross-Contamination and Labeling
A flour that’s naturally gluten-free can still pick up gluten during processing. If oats are milled on the same equipment as wheat, trace amounts of gluten can end up in the bag. This matters most for people with celiac disease, where even tiny exposures cause intestinal damage.
The FDA defines “gluten-free” on a label as containing less than 20 parts per million of gluten. That applies to any product, including flours. A bag of rice flour or oat flour carrying a “gluten-free” label has been verified to fall below that threshold. Wheat, rye, barley, and their hybrids (like triticale) cannot be labeled gluten-free unless they’ve been specially processed to remove gluten and test below 20 ppm.
Research on shared kitchen environments offers some reassurance for home cooks. Using shared utensils, ovens, and equipment generally doesn’t raise gluten levels above the 20 ppm limit when reasonable care is taken. The one clear exception: cooking gluten-free and regular pasta in the same pot of water pushes gluten levels well above the safe threshold, though rinsing the pasta under running water for a few seconds brings it back below 20 ppm.
If you need to stay under 20 ppm, look for the “gluten-free” label on any flour you buy, even flours that seem obviously safe like rice or almond. The label confirms the manufacturer has addressed cross-contamination during milling and packaging.