Cups of all-purpose flour to grams
1 US cup of all-purpose 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 all-purpose 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, unbleached, 1 cup | 125 g | 4.41 oz |
| King Arthur Baking | All-Purpose Flour | 120 g | 4.23 oz |
Spread across sources: 4% 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.
For all-purpose flour the two sources are close but not identical: USDA lists 125 g for a cup of enriched unbleached flour and King Arthur lists 120 g. The gap of 4% is small next to what a heavy hand does. Flour packs when it is scooped straight out of a bag, so the same cup can weigh noticeably more than either figure. Neither source publishes a scooped weight, so we have not put a number on it here.
We default to 120 g per US cup because it is King Arthur's published figure, and a recipe written with gram weights from that source will usually match it. If your recipe came with its own gram weight, always use that and ignore this page.
In a metric (250 ml) cup the same flour is about 127 g, because the cup is 5.7% bigger. In UK and Australian recipes, plain flour is the nearest match to US all-purpose flour; self-raising flour is a different product (King Arthur's self-rising figure is in the table on the whole wheat flour page).
Cups of all-purpose 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 all-purpose 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 all-purpose 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, all-purpose, enriched, unbleached (FDC ID 168936). 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): All-Purpose 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 all-purpose flour?
1 US cup of all-purpose flour is 120 g by our default (King Arthur). USDA lists 125 g and King Arthur lists 120 g. A 250 ml metric cup holds about 127 g.
How many grams is 1/2 cup of all-purpose flour?
1/2 US cup of all-purpose flour is 60 g (2.12 oz). In a metric cup it is 63.4 g.
How many grams is 1/4 cup of all-purpose flour?
1/4 US cup of all-purpose flour is 30 g (1.06 oz).
How many cups is 100 g of all-purpose flour?
100 g of all-purpose flour is 0.83 US cups (about 7/8 cups), or 0.79 metric cups.
How many cups is 500 g of all-purpose flour?
500 g of all-purpose flour is 4.17 US cups, or 3.94 metric cups.
Is plain flour the same as all-purpose flour?
They are close substitutes for most baking. Plain flour is the UK and Australian name for a flour of moderate protein content with no raising agent; US all-purpose flour is used in the same way. The weight per cup is the same to within the measuring error shown in the table.