Cups of bread flour to grams
1 US cup of bread flour = 120 g (4.2 oz). A 250 ml metric cup = 127 g.
Type 1/2, 1 1/2 or 0.75. The cup size changes the volume; the weight scales by volume, so it assumes the same filling method in every cup.
What the sources say about a cup of bread flour
Two published sources, side by side. Where a source lists several forms or ways of measuring, each is a row.
| Source | What was measured | Grams per US cup | Ounces |
|---|---|---|---|
| Our default | See “why this number” below | 120 g | 4.23 oz |
| USDA FoodData Central | Enriched, 1 cup | 137 g | 4.83 oz |
| King Arthur Baking | Bread Flour | 120 g | 4.23 oz |
Spread across sources: 14% between USDA and King Arthur for the main entry. Ingredient weights vary by brand, packing and humidity; the table is a reference, not a guarantee.
Why this number: 120 g per US cup
We use King Arthur's published figure, which is a stated reference for home bakers and is the weight most gram-based recipes from that source use. Where the two sources disagree, both figures are in the table above and in the calculator, so you can switch to the one your recipe was written with.
Bread flour shows the widest source gap of the common flours. King Arthur lists 120 g per cup, the same as its all-purpose flour, while USDA lists 137 g, a difference of 14%. Protein content changes how a flour behaves in dough but not how much a cup of it weighs, so the gap is almost certainly down to how the cup was filled rather than to the flour itself.
If a bread recipe is given in cups only, weigh the first cup you scoop and compare it with the table before you commit to a hydration. A dough made from 137 g cups is noticeably stiffer than one made from 120 g cups at the same water volume. For loaves, the water-to-flour ratio matters more than the cup.
The UK name is strong white flour. A metric cup (250 ml) holds about 127 g at our default weight.
Cups of bread flour to grams chart
| US cups | Grams (US cup) | Ounces | Grams (metric 250 ml cup) |
|---|---|---|---|
| 1/8 cup | 15 g | 0.53 oz | 15.9 g |
| 1/4 cup | 30 g | 1.06 oz | 31.7 g |
| 1/3 cup | 40 g | 1.41 oz | 42.3 g |
| 1/2 cup | 60 g | 2.12 oz | 63.4 g |
| 2/3 cup | 80 g | 2.82 oz | 84.5 g |
| 3/4 cup | 90 g | 3.17 oz | 95.1 g |
| 1 cup | 120 g | 4.23 oz | 126.8 g |
| 1 1/2 cups | 180 g | 6.35 oz | 190.2 g |
| 2 cups | 240 g | 8.47 oz | 253.6 g |
| 3 cups | 360 g | 12.7 oz | 380.4 g |
| 4 cups | 480 g | 16.93 oz | 507.2 g |
Grams of bread flour to cups
| Grams | US cups (decimal) | US cups (nearest 1/8) | Metric cups (250 ml) |
|---|---|---|---|
| 25 g | 0.21 | 1/4 | 0.2 |
| 50 g | 0.42 | 3/8 | 0.39 |
| 100 g | 0.83 | 7/8 | 0.79 |
| 125 g | 1.04 | 1 | 0.99 |
| 150 g | 1.25 | 1 1/4 | 1.18 |
| 200 g | 1.67 | 1 2/3 | 1.58 |
| 250 g | 2.08 | 2 1/8 | 1.97 |
| 300 g | 2.5 | 2 1/2 | 2.37 |
| 400 g | 3.33 | 3 1/3 | 3.15 |
| 500 g | 4.17 | 4 1/8 | 3.94 |
| 1,000 g | 8.33 | 8 1/3 | 7.89 |
US cup, metric cup and spoons
One US cup of bread flour at our default weight is 120 g. A 250 ml metric cup, used in Australia, New Zealand, Canada and many metric recipes, holds the same volume plus 5.7%, which is 127 g. A US legal (nutrition label) cup of 240 ml is 122 g. These all assume the same packing as the US cup; read about it on US cup vs metric cup.
| Spoon | Grams |
|---|---|
| 1 tablespoon (15 ml) | 7.5 g |
| 1 teaspoon (5 ml) | 2.5 g |
| 1 Australian tablespoon (20 ml) | 10.1 g |
Sources and when they were checked
- USDA FoodData Central, SR Legacy (April 2018 release), food Wheat flour, white, bread, enriched (FDC ID 168896). Gram weights per household measure as published; per-cup figures where USDA lists a different amount (such as 2 tablespoons) are scaled.
- King Arthur Baking, Ingredient Weight Chart, row(s): Bread Flour. Chart rows that list a quarter cup, half cup or tablespoon are scaled to a full cup on this page; the original listing is shown in the table above.
- Cup volumes: the US customary cup is exactly 236.5882365 ml; the US nutrition-label cup is defined in US law as 240 ml (21 CFR 101.9); the metric cup is 250 ml (see US cup vs metric cup).
Last checked 27 October 2026. Weights are for reference: ingredients vary by brand, humidity and how they are packed. If your recipe gives gram weights, use those.
Frequently asked questions
How many grams is 1 cup of bread flour?
1 US cup of bread flour is 120 g by our default (King Arthur). USDA lists 137 g and King Arthur lists 120 g. A 250 ml metric cup holds about 127 g.
How many grams is 1/2 cup of bread flour?
1/2 US cup of bread flour is 60 g (2.12 oz). In a metric cup it is 63.4 g.
How many grams is 1/4 cup of bread flour?
1/4 US cup of bread flour is 30 g (1.06 oz).
How many cups is 100 g of bread flour?
100 g of bread flour is 0.83 US cups (about 7/8 cups), or 0.79 metric cups.
How many cups is 500 g of bread flour?
500 g of bread flour is 4.17 US cups, or 3.94 metric cups.
Does a cup of bread flour weigh more than all-purpose flour?
Not by King Arthur's chart, which gives both as 120 g. USDA lists 125 g for all-purpose and 137 g for bread flour, so on USDA's figures it does. The honest answer is that it depends on how the cup was filled.