Enter grams or cups of water into the calculator to convert to the other value.
Grams to Cups of Water Formula
cups = grams / 236.5882
- cups — volume in US cups
- grams — mass of water in grams
- 236.5882 — milliliters in one US cup
This works because water has a density of 1 g/ml, so grams of water and milliliters of water are interchangeable. For a metric cup, divide grams by 250 instead. For a UK imperial cup, divide by 284.131.
Quick Reference Tables
Common conversions for water:
| Grams | US Cups | Metric Cups | ml |
|---|---|---|---|
| 50 g | 0.211 | 0.2 | 50 |
| 100 g | 0.423 | 0.4 | 100 |
| 150 g | 0.634 | 0.6 | 150 |
| 200 g | 0.845 | 0.8 | 200 |
| 237 g | 1.000 | 0.948 | 237 |
| 250 g | 1.057 | 1.000 | 250 |
| 500 g | 2.113 | 2.0 | 500 |
| 1000 g | 4.227 | 4.0 | 1000 |
Cup sizes vary by region. Use the right one for your recipe:
| Cup Type | ml per cup | Used in |
|---|---|---|
| US legal cup | 240 | US nutrition labels |
| US customary cup | 236.5882 | US recipes |
| Metric cup | 250 | Australia, EU, Canada |
| UK imperial cup | 284.131 | Older UK recipes |
Worked Example and FAQ
Example: A recipe calls for 180 g of water. 180 ÷ 236.5882 = 0.761 US cups, or about 3/4 cup.
Is 250 g of water 1 cup? It is exactly 1 metric cup. In US cups, 250 g is 1.057 cups, so close enough for most cooking.
Why does this only work for water? The shortcut grams = ml relies on water's density of 1 g/ml. Flour, sugar, oil, and milk all have different densities, so the same gram value gives a different cup volume.
Does temperature matter? Slightly. Water is densest near 4°C. At room temperature or boiling, the difference is under 4%, which is well below typical cooking accuracy.
