Convert Fluid Ounces to Grams
Enter a volume in fluid ounces, pick an ingredient, and get the equivalent weight in grams.
What this fluid ounces to grams calculator does
This calculator converts fluid ounces (volume) into grams (mass). Since fluid ounces and grams measure different things, a direct one-number conversion does not always work. The missing piece is density.
For example, 8 fluid ounces of water and 8 fluid ounces of honey have the same volume, but very different weights. That is why this tool lets you select the ingredient (or enter a custom density).
How the conversion works
Step 1: Convert fluid ounces to milliliters
The tool supports both US and Imperial fluid ounces:
- US fluid ounce: 29.5735 mL
- Imperial fluid ounce: 28.4131 mL
Step 2: Convert milliliters to grams using density
Formula used:
grams = fluid ounces × mL per fluid ounce × density (g/mL)
If density is 1.00 g/mL (water), 1 US fluid ounce is about 29.57 grams. If density is higher (like honey), grams increase. If density is lower (like oil), grams decrease.
Density values used in this calculator
These are practical kitchen/lab approximations:
- Water: 1.00 g/mL
- Milk: 1.03 g/mL
- Olive oil: 0.91 g/mL
- Honey: 1.42 g/mL
- Maple syrup: 1.33 g/mL
- Heavy cream: 0.99 g/mL
- Corn syrup: 1.38 g/mL
- Melted butter: 0.96 g/mL
Quick conversion chart (US fl oz to grams for water)
| US fluid ounces | Approximate grams (water) |
|---|---|
| 1 fl oz | 29.57 g |
| 2 fl oz | 59.15 g |
| 4 fl oz | 118.29 g |
| 6 fl oz | 177.44 g |
| 8 fl oz | 236.59 g |
| 12 fl oz | 354.88 g |
| 16 fl oz | 473.18 g |
| 24 fl oz | 709.76 g |
| 32 fl oz | 946.35 g |
Why results can vary between calculators
- Some tools assume every liquid has water-like density.
- Some tools use US fl oz, others use Imperial fl oz.
- Temperature can slightly change density.
- Rounded constants can create small differences.
Frequently asked questions
Is a fluid ounce the same as an ounce by weight?
No. A fluid ounce measures volume, while an ounce (oz) usually means weight. They are not interchangeable without density.
Can I use this for baking ingredients?
Yes, especially liquids and syrups. For dry ingredients, packing and particle size can affect effective density, so kitchen scale measurements are still best.
How do I convert grams back to fluid ounces?
Use the reverse formula:
fluid ounces = grams ÷ (mL per fluid ounce × density)
Which fluid ounce should I choose?
Use US fluid ounce for most US recipes and nutrition labels. Use Imperial fluid ounce for many UK references.
Whether you're meal prepping, baking, mixing drinks, or working in a lab, this fluid ounces to grams calculator gives a fast and practical conversion with the ingredient-specific precision that simple charts miss.