Convert Cups to Grams: Water
Convert cups of water to grams with this complete reference table. 1 cup of water = 240g (USDA FoodData Central, spooned-and-leveled method). Use the table below for fractions from 1/8 cup up to 4 cups. For precision baking, weight measurements in grams are always more reliable than volume measurements in cups, because water density can vary by measuring technique.
Water Cups to Grams Table
| Cups | Grams |
|---|---|
| 1/8 cup | 30g |
| 1/4 cup | 60g |
| 1/3 cup | 80g |
| 1/2 cup | 120g |
| 2/3 cup | 160g |
| 3/4 cup | 180g |
| 1 cup | 240g |
| 1 1/4 cups | 300g |
| 1 1/2 cups | 360g |
| 2 cups | 480g |
| 3 cups | 720g |
| 4 cups | 960g |
Based on USDA FoodData Central data (1 US cup = 240ml = 16 tablespoons = 48 teaspoons). Note: Water is the reference point for all density measurements. 1 cup (240ml) = 240g exactly. All liquid measurements in recipes assume water-like density unless specified. Use water as baseline for density calculations.
About Water Density
The density of water determines how much it weighs per unit of volume. At 1g/ml, 1 US cup (240ml) of water weighs 240g under USDA standard conditions.
Volume measurements can vary by ±10–20% depending on technique (sifted vs. spooned vs. scooped). For consistent baking results, use a kitchen scale with gram measurements whenever possible. The USDA standard (spooned-and-leveled) is the reference point for all values on this page.
Frequently Asked Questions
How many grams is 1 cup of water?
1 cup of water weighs 240 grams (USDA FoodData Central, spooned-and-leveled method, 1 US cup = 240ml).
How many grams is 1/2 cup of water?
1/2 cup of water weighs 120 grams.
How many grams is 1/4 cup of water?
1/4 cup of water weighs 60 grams.
Does measuring technique affect the weight of water?
Yes. Sifted water can weigh up to 20% less than packed or scooped. The USDA standard (spooned-and-leveled) of 240g/cup is the most reliable baseline.