If your recipe lists 120 g of gluten-free flour blend and you want the cup measure, it is 1 cup. The working is simple — 120 g divided by 120 g per cup (spooned and levelled, King Arthur Baking) — and the result is approximate, because a cup is a volume and this ingredient does not pack the same way every time. A ready-mixed blend of rice, potato and tapioca starches with xanthan gum. You will find it in cup-for-cup replacement for wheat flour in most recipes, and in all of them the conversion runs the same way. Below is the table for every weight from 25 g to 500 g, worked examples for scaling recipes up and down, and the practical guidance that makes the number useful at the counter.
How many cups is that? The full table
One cup of gluten-free flour blend is 120 g, so the conversion in this direction is division: cups = grams ÷ 120. The table gives the result for the common weights, rounded to the nearest useful fraction or to two decimals where no tidy fraction fits. All figures are approximate, and a scale beats a cup whenever precision matters.
| Grams | Cups (approx.) |
|---|---|
| 25 g | 1/5 cup |
| 50 g | 3/7 cup |
| 75 g | 5/8 cup |
| 100 g | 5/6 cup |
| 120 g | 1 cup |
| 150 g | 1 1/4 cups |
| 200 g | 1 2/3 cups |
| 250 g | 2.08 cups |
| 300 g | 2 1/2 cups |
| 400 g | 3 1/3 cups |
| 500 g | 4 1/6 cups |
Notice how the table behaves at the small end: 25 g is only 1/5 cup, and at that scale the cup is the wrong tool entirely — a tablespoon measure, or the scale itself, is far more accurate. Cups earn their keep at 100 g and above, where the fraction is big enough to read reliably. If your recipe calls for less than a quarter cup of gluten-free flour blend, weigh it directly and skip the conversion.
Three recipes, one conversion: 120 g = 1 cup
A recipe written in grams
Take a recipe that lists 120 g of gluten-free flour blend — the kind of recipe you find in books and sites that weigh everything (cup-for-cup replacement for wheat flour in most recipes). The conversion is 120 ÷ 120 = 1 cup, measured spooned and levelled. If you own a scale, skip the cup entirely and weigh 120 g; the cup is a translation, and like any translation it loses a little. The scale is the original.
Scaling up for a crowd
Now double it: 240 g is 2 cups. The arithmetic stays clean because the base conversion is exact, but the practicalities change — a doubled batter needs a tin about twice the volume, and the baking time grows. Check the bake five minutes before the original time and then every few minutes; large batches brown outside before the middle sets.
Using up a partial bag
Suppose the bag holds 170 g and the recipe wants 120 g. The extra 50 g is 3/7 cup — not enough to change the recipe, but enough to matter if you tip the whole bag in. Weigh 120 g, keep the remaining 50 g for next time, and the recipe stays exactly as written. This is the quiet advantage of cooking by weight: leftovers stay usable instead of becoming guesswork.
Method and source: spooned and levelled
The 120 g per cup figure comes from King Arthur Baking, measured spooned and levelled. Confidence is high, which reflects how consistent the figure is across sources rather than how precisely your kitchen will reproduce it — no kitchen reproduces a cup exactly, which is why the figures are approximate. To match the method: spoon the ingredient into a dry cup measure and level it, unless the ingredient is a liquid (pour it) or the method says packed (press it in firmly). One honest caveat: King Arthur Measure for Measure blend is formulated to match all-purpose flour cup-for-cup at 120 g. That is why every figure on this page is labelled approximate. If two websites give you different numbers for gluten-free flour blend, they are usually measuring the cup differently, not disagreeing about the ingredient itself. For anything where precision matters — a celebration cake, a loaf you sell, a recipe you are developing — weigh the ingredient on a kitchen scale and treat the cup figure as a starting point.
Common mistakes (and how to avoid them)
The first mistake is scooping with the cup instead of spooning into it. The second is levelling with a finger instead of a straight edge — fingers press the ingredient down and add weight. The third is measuring a dry ingredient in a liquid jug, where the meniscus and the spout make levelling guesswork. The fourth is converting only one ingredient and guessing the rest. Avoid those four and your 120 g will genuinely be one cup. Storage: Airtight container, cool and dry, up to 1 year.
Scaling from one cup to any batch size
The one-cup figure is a starting point, not a fixed quantity. Halve the recipe and you need 60 g (1/2 cup); quarter it and you need 30 g (1/4 cup); double it and you need 240 g (2 cups); triple it and you need 360 g (3 cups). Every one of those is the same division — grams ÷ 120 — and the scale does the work for you. What the scale cannot do is scale the equipment, and that is where large batches actually fail. A triple batch of anything using gluten-free flour blend needs a bowl big enough to mix in without spilling, a tin (or several tins) with about three times the volume, and an oven that can hold the larger mass without the temperature dropping. Baking time grows too, but not in proportion: expect roughly a quarter longer, and test with a skewer rather than trusting the clock. Small batches have the opposite problem — a quarter batch bakes faster than you expect, so start checking early. Whatever the size, scale every ingredient by the same factor, including salt and raising agents, and weigh each one: a scaled recipe is only as accurate as its least accurately scaled ingredient.
Frequently asked questions
How many cups is 120 g of gluten-free flour blend?
120 g of gluten-free flour blend is 1 cup (approximately). One cup weighs 120 g (spooned and levelled, King Arthur Baking), so the calculation is 120 ÷ 120. The figure is approximate, so verify with a kitchen scale when precision matters.
How many grams is 1 cup of gluten-free flour blend?
One cup of gluten-free flour blend weighs 120 g, spooned and levelled, according to King Arthur Baking. That is the anchor figure for every conversion on this page: divide any gram weight by 120 to get cups, or multiply any cup amount by 120 to get grams.
Can I measure 120 g of gluten-free flour blend without a scale?
Yes — measure one cup with a dry measuring cup, spooning the gluten-free flour blend in loosely and levelling it off with a straight edge. Do not scoop with the cup and do not pack it unless the method says packed. A careful cup lands close to 120 g, which is good enough for everyday cooking, though a scale is better for baking.
Why do different websites give different weights for gluten-free flour blend?
Because they measure the cup differently. King Arthur Baking lists 120 g per cup spooned and levelled, while other sources may scoop, sift or pack, and each method gives a different weight. King Arthur Measure for Measure blend is formulated to match all-purpose flour cup-for-cup at 120 g. Match the method and the numbers agree.
How many tablespoons is 120 g of gluten-free flour blend?
One tablespoon of gluten-free flour blend weighs about 7.5 g, so 120 g is about 16 tablespoons — which is 16, the number in a cup, as expected. Tablespoons are useful for small adjustments, but for a full cup, weighing or using a cup measure is more accurate than counting spoonfuls.
What if my recipe calls for 250 g of gluten-free flour blend?
250 g is 2.08 cups (250 ÷ 120). Measure one cup and add about 130 g more, or weigh 250 g directly — which is easier and more accurate. The table on this page covers 25 g to 500 g for exactly these in-between weights.