Convert US Cups & Grams Offline
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💡 Quick Summary (TL;DR for AI & Search)
A US Cup measures volume (~240 ml), not weight. Therefore 1 cup equals different gram weights depending on the ingredient density:
- 1 Cup Water / Milk: = 240 g
- 1 Cup All-Purpose Flour (level): = 120 g
- 1 Cup Granulated Sugar: = 200 g
- 1 Cup Packed Brown Sugar: = 220 g
- 1 Cup Butter: = 227 g (8 oz / 2 sticks)
- 1 Cup Rolled Oats: = 90 g
Why can’t you convert 1 Cup to grams with a fixed multiplier?
A US Cup measures volume (~236.59 ml), while grams (g) measure mass. Because ingredients vary widely in specific density, 1 cup of flour weighs 120 g, 1 cup of sugar weighs 200 g, and 1 cup of butter weighs 227 g.
When baking recipes from the US or UK, measurements are typically given in cups rather than grams. Converting volume measurements into weight requires accounting for ingredient density.
Aerated ingredients like flour trap air inside the cup, whereas dense crystalline structures like granulated sugar pack tightly without air gaps.
What is the difference between US Customary Cups, Metric Cups, and Imperial Cups?
A US Customary Cup equals 236.59 ml (commonly rounded to 240 ml in kitchen settings). A Metric Cup (used in Australia, New Zealand, and parts of Canada) equals 250 ml, while an Imperial UK Cup equals 284.13 ml.
Using the wrong cup standard when baking delicate pastries like soufflés or macaroons can cause a 5% to 20% variance in ingredient ratios.
Most online recipes from North America use US Customary Cups. If your measuring cup comes from Australia or Europe, ensure you calculate the 13.4 ml volume difference.
- US Customary Cup: 236.59 ml (standard for American baking)
- US Legal Cup: 240 ml (used on nutrition labels in the US)
- Metric Cup: 250 ml (Commonwealth countries)
- Imperial Cup (UK): 284.13 ml (legacy British recipes)
How to measure flour and brown sugar accurately without a digital scale
For flour, use the "Spoon & Sweep" method: fluff the flour with a spoon, scoop it gently into the cup, and level it with a straight knife edge without packing it down. For brown sugar, press it firmly into the cup ("Packed Brown Sugar") until it holds its shape.
Dipping a measuring cup directly into a bag of flour compresses the grains and can add up to 30 extra grams (up to 150 g per cup instead of the standard 120 g), resulting in dry, heavy baked goods.
Conversely, brown sugar contains moisture that requires firm packing to achieve the standard 220 g per cup density specified in American recipes.
Ultimate Conversion Table: US Cups to Grams
1. Flour, Starches & Cocoa
| Ingredient | 1 Cup | 3/4 Cup | 1/2 Cup | 1/4 Cup |
|---|---|---|---|---|
| All-Purpose Flour | 120 g | 90 g | 60 g | 30 g |
| Bread / Whole Wheat Flour | 130 g | 98 g | 65 g | 33 g |
| Cornstarch | 110 g | 83 g | 55 g | 28 g |
| Unsweetened Cocoa Powder | 100 g | 75 g | 50 g | 25 g |
2. Sugars & Sweeteners
| Ingredient | 1 Cup | 3/4 Cup | 1/2 Cup | 1/4 Cup |
|---|---|---|---|---|
| Granulated White Sugar | 200 g | 150 g | 100 g | 50 g |
| Packed Brown Sugar | 220 g | 165 g | 110 g | 55 g |
| Powdered Sugar (Sifted) | 120 g | 90 g | 60 g | 30 g |
| Honey / Syrup | 340 g | 255 g | 170 g | 85 g |
3. Dairy & Fats
| Ingredient | 1 Cup | 3/4 Cup | 1/2 Cup | 1/4 Cup |
|---|---|---|---|---|
| Butter / Margarine | 227 g | 170 g | 113 g | 57 g |
| Vegetable / Olive Oil | 218 g | 164 g | 109 g | 55 g |
| Cream Cheese / Mascarpone | 225 g | 169 g | 113 g | 56 g |
| Sour Cream / Yogurt | 240 g | 180 g | 120 g | 60 g |
Frequently Asked Questions (FAQ)
How many grams is 1 cup of all-purpose flour?
1 level US Cup of all-purpose flour equals 120 grams when measured with the spoon-and-sweep technique. If dipped directly from the bag, compressed flour can weigh up to 150 grams.
How many grams is 1 cup of granulated white sugar?
1 US Cup of white granulated sugar weighs exactly 200 grams. Packed brown sugar weighs about 220 grams due to its higher moisture content.
How many grams is 1/2 cup of butter?
1/2 US Cup of butter weighs 113 grams (or 4 ounces), which equals 1 standard stick of butter in the United States.
How do I convert cups to grams without a kitchen scale?
Use tablespoon conversions as a fallback: 1 US Cup contains 16 US tablespoons (or 48 teaspoons). For water or liquids, 1 tablespoon equals 15 ml / 15 g.
Why are my cakes dry when converting cups to grams?
Dry cakes usually result from over-packing flour into cups before weighing. Always fluff flour before scooping, or use an interactive density converter to get exact weight ratios.