How Much Is 4 Fluid Ounces of Water in Grams?
4 fluid ounces of water weighs 118.30 g. This is based on water having a density of 236.59g per cup. Because fluid ounces measure volume and grams measure weight, the result depends on the ingredient, and a different ingredient would give a different result for the same 4 fluid ounces.
Formula and Step-by-Step
- Start with 4 fluid ounces of water
- 1 fluid ounce of water = 29.57g
- 4 × 29.57 = 118.30g
The same formula works for any amount. Multiply (or divide) by the density, then convert units as needed.
Measuring Tip
For liquids, place your measuring cup on a flat surface and read at eye level. The bottom of the meniscus (the curve at the surface) should align with the measurement line.
Water at Different Amounts
How water scales across common fluid ounces measurements. Your amount (4 fluid ounces) is highlighted.
For reference, 4 fluid ounces of water (118.30g) is close in weight to a bar of soap (113g).
Other Amounts of Water
| Fluid Ounces | US Grams | UK Fluid Ounce |
|---|---|---|
| 1 fluid ounce | 29.57 g | 28.41 g |
| 2 fluid ounces | 59.15 g | 56.83 g |
| 3 fluid ounces | 88.72 g | 85.24 g |
| 4 fluid ounces | 118.30 g | 113.65 g |
| 5 fluid ounces | 147.87 g | 142.06 g |
| 6 fluid ounces | 177.44 g | 170.48 g |
| 8 fluid ounces | 236.59 g | 227.30 g |
| 10 fluid ounces | 295.74 g | 284.13 g |
| 12 fluid ounces | 354.89 g | 340.95 g |
| 16 fluid ounces | 473.18 g | 454.60 g |
Understanding the Units
What is a Fluid Ounce?
The US fluid ounce (29.574 ml) and the UK fluid ounce (28.413 ml) are different sizes. The UK version is about 4% smaller. This means a UK recipe calling for 8 fl oz gives you 227 ml, while 8 US fl oz gives you 237 ml. The difference is small per ounce but adds up in larger quantities.
What is a Gram?
Weighing ingredients in grams eliminates the variability of volume measurements. A cup of flour can weigh anywhere from 120g to 160g depending on how it was scooped, but 120g of flour is always 120g of flour.