Quick Answer
100 grams is equivalent to 3.3814 fluid ounces (fl oz). This conversion is useful for cooking and baking recipes that call for weight measurements in grams but require volume measurements in fluid ounces.
Calculating Grams to Fluid Ounces
To convert from grams to fluid ounces, we need to use the density of water. Since water has a density of 1 gram per milliliter, 100 grams of water would occupy 100 milliliters.
There are 29.5735 milliliters in 1 fluid ounce. So we can calculate:
| 100 grams | = 100 mL | |
| 100 mL | ÷ 29.5735 mL/fl oz | = 3.3814 fl oz |
Therefore, 100 grams is equivalent to 3.3814 fluid ounces.
Converting Volumes and Weights of Other Liquids
The conversion above relies on the fact that water has a density of 1 g/mL. For other liquids, we need to account for differences in density.
For example, vegetable oil has a density of about 0.92 g/mL. Using the density equation:
Density = Mass / Volume
We can calculate that 100 grams of vegetable oil would occupy a volume of:
| Density of vegetable oil: | 0.92 g/mL | ||
| Mass: | 100 g | ||
| Volume: | Mass / Density | = 100 g / 0.92 g/mL | = 108.7 mL |
Then to convert 108.7 mL to fluid ounces:
| 108.7 mL | ÷ 29.5735 mL/fl oz | = 3.67 fl oz |
So 100 grams of vegetable oil would be equivalent to 3.67 fluid ounces.
This demonstrates that the conversion depends on the density of the liquid in question. Heavier liquids like honey would occupy less volume, while lighter liquids like alcohol would take up more volume. Consulting a table of densities allows conversions between mass and volume.
Uses for Converting Grams to Fluid Ounces
Some common uses for converting between grams and fluid ounces include:
Cooking and Baking
Many cooking and baking recipes call for ingredients by weight in grams, especially for flour, sugar, butter, and liquids like milk or water. However, volume measurements like cups or fluid ounces are more convenient to measure out. Converting between grams and fluid ounces allows cooks and bakers to adapt recipes and measure ingredients easily.
For example, a recipe might call for 235g flour. By converting to fl oz, you can measure out the appropriate volume in a liquid measuring cup:
| 235 g flour | = 235 mL water (since flour density ~ water density) | ÷ 29.5735 mL/fl oz | = 7.95 fl oz |
So instead of getting out a kitchen scale, you can simply measure 235g of flour as about 8 fl oz in a measuring cup.
Nutrition Tracking
Many people track their daily nutrition by weighing food. But nutrition information is often listed by fluid volume. Converting grams of food to fluid ounces allows people to compare their intake to nutrition data.
For example, weighing a glass of milk gives 150g. But nutrition info for milk is listed as 8 fl oz per serving. By converting grams to fluid ounces, you can determine the number of servings:
| 150 g milk | = 150 mL milk | ÷ 29.5735 mL/fl oz | = 5.1 fl oz |
So 150g of milk is equivalent to 5.1 fl oz, or about 0.6 servings of milk.
Recipe Alterations
When cooking for different yields, it is useful to convert between mass and volume. For example, if you want to double a recipe, you can easily calculate the new gram weight of ingredients based on their volumes.
Let’s say a recipe calls for 2 fl oz olive oil. To double it to serve 4 people:
| Original amount: | 2 fl oz olive oil |
| Convert to mL: | 2 fl oz x 29.5735 mL/fl oz = 59.147 mL |
| Double the recipe: | 59.147 mL x 2 = 118.3 mL |
| Convert back to grams: | 118.3 mL x 0.92 g/mL density = 108.8 g |
So for a doubled recipe, you would need 108.8 grams of olive oil instead of the original 2 fl oz.
Other Useful Conversions
In addition to grams to fluid ounces, some other useful conversions include:
Grams to Milliliters
Since 1 milliliter of water equals 1 gram, converting grams to milliliters for water-based liquids is a 1:1 conversion:
| 100 g water | = 100 mL water |
For other liquids, you would need to account for density as shown earlier.
Grams to Cups
There are officially 236.588 mL in 1 US cup. So gram to cup conversions can be made by:
| Grams | → convert to mL | → divide by 236.588 mL/cup | |
| 100 g water | = 100 mL water | ÷ 236.588 mL/cup | = 0.42 cups |
Again, the density must be factored in for other liquids besides water. Cup measurements are very convenient for cooking and baking.
Grams to Pounds
This conversion is useful for dealing with large masses or weights. There are 453.592 grams in 1 pound. To convert:
| Grams | ÷ 453.592 g/lb | = Pounds |
| 100 g | ÷ 453.592 g/lb | = 0.22 lbs |
Conclusion
In summary, there are 3.3814 fluid ounces (fl oz) in 100 grams for water-based liquids like water, milk, or juice. The conversion may differ slightly for other liquids based on density. Converting between grams and fluid ounces is useful for recipes, nutrition tracking, yield adjustments, and other applications. Other handy conversions include grams to milliliters, cups, and pounds. Just remember to account for density as needed.