Liquids
Water: US cup to gram
1 US cup of Water = 237 gram — based on a density of 1 g/ml.
| US cup | gram |
|---|---|
| 0.125 | 30 |
| 0.25 | 59 |
| 0.333 | 79 |
| 0.5 | 118 |
| 0.75 | 177 |
| 1 | 237 |
| 1.5 | 355 |
| 2 | 473 |
| 3 | 710 |
| 4 | 946 |
Why the ingredient matters
A cup is a volume, not a weight. Water has a density of 1 g/ml — different ingredients give different weights for the same cup. That's why generic « cup to gram » charts are wrong by 10–30 %.
How precise is this?
The density used here is sourced and cross-checked. Real-world measures still vary by about ±1% depending on how the cup is filled — sifted, scooped or packed.
Data sources
- USDA FoodData Central — Public domain (US government work)
- ANSES Ciqual — table de composition — Licence Ouverte / Open Licence (Etalab)
Frequently asked questions
How many gram is 1 US cup of Water?
1 US cup of Water equals about 237 gram, using a density of 1 g/ml.
Is a US cup the same as a metric cup?
No — a US cup is 236.6 ml, a metric cup 250 ml, an imperial cup 284 ml. This page uses the US cup; the converter lets you switch conventions.
Why do different sites give different answers?
Most charts use one generic density for every ingredient. We use the measured density of Water itself — that is the physically correct conversion.
Should I weigh ingredients instead of using cups?
Yes, whenever possible — a scale removes fill-density error entirely, especially for flour and powders.