Grams to Fluid Ounces Calculator
Convert grams (mass) to US fluid ounces (volume) for any cooking ingredient. Select an ingredient to apply its density automatically, or enter a custom density.
g
Ingredient
Grams ÷ density (g/mL) ÷ 29.5735 = US fl oz
- 1
Volume in mL
100 ÷ 1 = 100 - 2
US Fluid Ounces
100 ÷ 29.5735 = 3.38
How does this calculator work?
fl oz = grams ÷ density (g/mL) ÷ 29.5735. Select an ingredient to get its bulk density automatically. 100 g water ≈ 3.38 fl oz; 100 g flour ≈ 5.71 fl oz; 100 g honey ≈ 2.38 fl oz. Secondary outputs include mL, tablespoons, teaspoons, and cups. US fl oz only — UK fl oz ≈ 28.41 mL.
Formula
How this is calculated
Grams measure mass and fluid ounces measure volume, so the ingredient's density is needed to convert between them. The conversion has two steps: divide the gram weight by the ingredient's density in g/mL to get milliliters, then divide by 29.5735 (mL per US fluid ounce) to arrive at fl oz.
The built-in list covers the most common cooking items with standard bulk densities. Water is 1.000 g/mL by definition, but dry ingredients pack very differently — all-purpose flour sits at about 0.593 g/mL and powdered sugar around 0.560 g/mL because of air trapped between particles. These values assume normal scooping technique, not sifted or compressed measurement. Selecting "Custom ingredient" lets you enter any density you know.
This calculator outputs US fluid ounces (29.5735 mL each). UK imperial fluid ounces are slightly smaller (about 28.41 mL), so if your recipe is British, note that distinction. For liquids close in density to water — milk, cream, most cooking oils — grams and milliliters are nearly interchangeable, and the fl oz result will be close to dividing mL by 30.
Frequently asked questions
Grams measure mass and fluid ounces measure volume; the ratio between them depends on how dense the ingredient is. 100 g of water ≈ 3.38 fl oz, but 100 g of honey (denser) ≈ 2.38 fl oz, and 100 g of flour (much less dense) ≈ 5.71 fl oz. A fixed ratio only applies to one specific substance.
They are standard bulk densities used in culinary contexts. Actual density can shift slightly with scooping technique, humidity, or brand — sifted flour is lighter, packed flour is heavier. For critical food-production work, weigh your specific batch and use a measured or laboratory density value.
A US fluid ounce equals 29.5735 mL; a UK imperial fluid ounce equals 28.4131 mL — about 4% smaller. This calculator uses the US definition. If your recipe is British, divide the mL result by 28.41 instead of 29.57.
Also known as
TG we-Calculate Editorial Team. (2026). Grams to Fluid Ounces Calculator [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/grams-to-fl-oz-calculator
TG we-Calculate Editorial Team. "Grams to Fluid Ounces Calculator." TG we-Calculate. 2026. https://we-calculate.com/calculator/grams-to-fl-oz-calculator.
TG we-Calculate Editorial Team, "Grams to Fluid Ounces Calculator," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/grams-to-fl-oz-calculator
@misc{wecalculate_grams_to_fl_oz_calculator, title = {Grams to Fluid Ounces Calculator}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/grams-to-fl-oz-calculator}}, year = {2026}, note = {TG we-Calculate} }
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