1 Cup Gluten-Free Flour Blend in Grams
1 cup of gluten-free flour blend weighs 120 g (spooned and levelled, King Arthur Baking). A ready-mixed blend of rice, potato and tapioca starches with xanthan gum. All the figures on this page are approximate conversions based on the King Arthur Baking value, so when a recipe really matters, verify with a kitchen scale.
A gluten-free flour blend is a ready-mixed combination of rice flour, potato starch, tapioca starch and a binder such as xanthan gum, designed to replace wheat flour cup for cup. The blend on this page is the King Arthur Measure for Measure blend, which is formulated to match all-purpose flour at 120 g per cup, so recipes convert by weight without any adjustment. That is the whole point of a blend: it takes the guesswork out of gluten-free baking, where single gluten-free flours each have their own weight, flavour and behaviour. The catch is that not all blends are the same, so the weight on this page applies to this blend and not to every bag labelled gluten-free.
Gluten-Free Flour Blend cups to grams conversion table
| Cups | Grams | Tablespoons |
|---|---|---|
| 1/4 cup | 30 g | 4 |
| 1/3 cup | 40 g | 5.3 |
| 1/2 cup | 60 g | 8 |
| 2/3 cup | 80 g | 10.7 |
| 3/4 cup | 90 g | 12 |
| 1 cup | 120 g | 16 |
| 1 1/2 cups | 180 g | 24 |
| 2 cups | 240 g | 32 |
| 3 cups | 360 g | 48 |
| 4 cups | 480 g | 64 |
One tablespoon of gluten-free flour blend weighs about 7.5 g, and a cup is 16 tablespoons, so the tablespoon column is simply the cup weight divided by 16. For small amounts, a scale that reads to the gram is far more reliable than a spoon, because a heaped tablespoon can weigh half as much again as a level one. All the values in this table are approximate, and they assume the ingredient is measured spooned and levelled, exactly as the source measured it.
Why a scale beats a cup for gluten-free flour blend
Flour is the ingredient where cup measurements fail most often, and the reason is packing. The same cup of flour can weigh anywhere from 120 g to 142 g depending on whether you scoop it straight from the bag or spoon it in lightly, and that 20 g swing is the difference between a tender cake and a dry one. In bread the error is more forgiving, because dough can be adjusted by feel, but in cakes, pastry and cookies there is no second chance once the batter is mixed. Weighing flour is the single highest-value habit a home baker can adopt, and it costs nothing more than a basic kitchen scale. It also makes recipes repeatable: the same numbers give the same loaf, the same crumb and the same rise every time you bake it.
Worked examples
A gluten-free chocolate cake
A gluten-free chocolate cake that calls for 2 cups of blend needs 240 g. Because the blend already contains xanthan gum, the batter will behave much like a wheat batter, but it benefits from a short rest before baking, which lets the starches hydrate and the crumb set properly. Weigh 240 g, mix as the recipe directs, and do not be tempted to add extra xanthan gum, which would make the cake gummy rather than tender.
Gluten-free cookies
Cookies are the easiest place to start with a gluten-free blend, because they ask little of the flour's structure. A batch using 1 1/2 cups of blend needs 180 g, creamed with butter and sugar and baked until the edges are set. The cookies will spread a little more than wheat cookies and they will be slightly more delicate when warm, so let them cool on the tray for five minutes before moving them.
Gluten-free pancakes
A pancake batter that calls for 1 cup of blend needs 120 g, whisked with milk and egg until just combined. Let the batter rest for ten minutes before cooking, because gluten-free batters thicken as they stand and the rest gives the starches time to hydrate. If the batter is too thick after resting, thin it with a spoonful of milk rather than adding more flour, which would make the pancakes heavy.
How the weight was measured
The figure on this page comes from King Arthur Baking, measured spooned and levelled unless the method line says otherwise. Spooning means filling the cup with a spoon rather than plunging the cup into the bag, and levelling means sweeping a knife across the rim. Scooping packs the ingredient down and can add a fifth or more to the weight, which is why two bakers following the same cup-based recipe can get visibly different results. Confidence in this value is high. That reflects how consistent the ingredient is from brand to brand: a uniform, factory-packed ingredient is more predictable than a fresh, variable one. Even a high-confidence figure is still an approximation, because moisture, grind size and settling all shift the weight a little. Treat the grams on this page as a reliable starting point and check with a scale when the recipe is fussy, expensive, or being made for the first time.
There is a dispute worth knowing about. King Arthur Measure for Measure blend is formulated to match all-purpose flour cup-for-cup at 120 g. The practical advice is simple: use the value in the table above, measure the way the table describes, and your results will match the recipes this site is built around. If a recipe you are following was written with a different value, follow that recipe's value instead of ours, because consistency within one recipe matters more than which authoritative number you pick.
Common mistakes
The most common mistake is scooping the cup directly through the bag. That packs the flour down and can add 20 g or more per cup, which is enough to turn a soft dough stiff or a moist cake dry. The second mistake is using a liquid measuring jug for flour. Jugs are read at eye level and cannot be levelled with a knife, so the amount is a guess dressed up as a measurement. The third is tapping or shaking the cup to settle the flour, which packs it further. And the fourth is forgetting that different flours weigh different amounts per cup: a cup of one flour is not interchangeable with a cup of another, even when the recipe says one cup of either. Always convert by weight for the flour you are actually using.
When this conversion matters most
This conversion matters most in baking, where flour provides the structure of the finished product. Cakes, pastry, cookies and enriched breads all depend on the ratio of flour to liquid, fat and sugar, and a 10 percent error in flour throws that ratio off. It matters less in recipes where flour is a thickener or a coating, such as a roux or a dusting for fried food, because small differences disappear into the cooking. It matters again when you scale a recipe up or down: doubling a scooped cup doubles the error, while doubling a weighed amount stays exact. If you bake the same recipe more than once, weighing is what makes the second batch taste like the first.
What to do if you do not have a scale
If you do not have a scale, spoon the flour into the cup until it is heaped, then sweep a straight knife across the top to level it off. Never scoop, never tap, and never press the flour down. That spooned-and-levelled method is exactly how the figure on this page was measured, so it is the closest you can get without weighing. It will still vary by a few grams from cup to cup, because flour settles and humidity changes its weight, but it is far closer than scooping. For recipes where flour is the main structure, such as sponge cakes and pastry, a scale that reads to the gram is worth buying before any other piece of baking equipment.
Storing gluten-free flour blend
Airtight container, cool and dry, up to 1 year. Keeping gluten-free flour blend properly stored matters for the conversion as well as for the flavour: an ingredient that has absorbed moisture from the air weighs more per cup than a dry one, and one that has dried out weighs less. Store it in an airtight container, away from heat and light, and measure it in the state the recipe expects, not straight from a damp or stale bag.
Frequently asked questions
Is every gluten-free flour blend the same weight per cup?
No. Blends differ in their ingredients and their ratios, and a cup of one blend can weigh 10 to 20 g more or less than a cup of another. The 120 g figure on this page is for the King Arthur Measure for Measure blend, which is formulated to match all-purpose flour cup for cup. If you use a different brand, check its own weight chart and use that, because using the wrong weight is the most common reason a gluten-free recipe fails.
Do I need to add xanthan gum to a gluten-free blend?
Not if the blend already contains it, and most ready-made blends do. Xanthan gum replaces the binding job that gluten does in wheat flour, holding the crumb together. Adding more on top of a blend that already has it makes bakes gummy and dense, so check the ingredients list first. If you are mixing your own blend from single flours, that is when xanthan gum becomes necessary.
Can I use cups instead of a scale for gluten-free flour blend?
Yes, but a scale is more accurate. If you measure gluten-free flour blend spooned and levelled, exactly as the figure on this page was measured, a cup will be close to 120 g, within a few grams. The problem is that most people scoop rather than spoon, which can add 15 to 25 percent to the weight, and that error is enough to change a bake. For everyday cooking, cups are fine. For baking, where the ratio of ingredients decides the result, weigh it and check the number on the scale.
How many tablespoons are in a cup of gluten-free flour blend?
There are 16 tablespoons in a US cup, so a cup of gluten-free flour blend is 16 tablespoons, and one tablespoon weighs about 7.5 g. A teaspoon weighs about 2.5 g. Tablespoons are useful when a recipe calls for a small amount, but they carry the same packing problem as cups: a heaped tablespoon can weigh half as much again as a level one, so level every spoon with the back of a knife, and use a scale for small amounts when accuracy matters.
Does the weight change if I pack or sift gluten-free flour blend?
Yes, and this is the single biggest source of error in cup measurements. gluten-free flour blend is measured spooned and levelled, and a scooped cup can weigh 15 to 25 percent more than a spooned cup, because scooping packs the ingredient down. Sifting has the opposite effect: it adds air and makes the cup lighter. Always measure the way the figure on this page was measured, spooned and levelled, and the weight will match the table.