Fluid Ounces to Kilograms Conversion Calculator
Enter the volume in fluid ounces below to calculate the weight in kilograms.
Result: Kilograms
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How to Convert Fluid Ounces to Kilograms
Since fluid ounces are a unit of volume and kilograms are a unit of mass, which are different physical quantities, we need to know one more physical quantity of the ingredient or substance to convert between them. In this case, we need to account for the density of the substance whenever we do a conversion.
Therefore, to convert between fluid ounces and kilograms of an ingredient or substance, we must either multiply or divide by its density, depending on which direction we are performing the conversion.
Fluid Ounces to Kilograms Formula
To convert a measurement in fluid ounces to kilograms, multiply the volume by the density of the ingredient, substance, or material. Note that in order for this to work, the density must be in kilograms per fluid ounce (kg/fl oz).
If the density is given in grams per milliliter (g/mL), then first divide the density by 33.8135 to convert to kg/fl oz.
For a density given in g/mL, you can use this simple formula to convert:
kilograms = fluid ounces × density / 33.8135
Thus, the weight in kilograms is equal to the volume in fluid ounces times the density (in g/mL) of the ingredient or material divided by 33.8135.
For example, here's how to convert 5 fluid ounces to kilograms for an ingredient with a density of 0.7 g/mL.
kilograms = 5 fl oz × 0.7 g/mL / 33.8135 = 0.1035 kg
Fluid Ounce to Kilogram Conversion Table
| Volume in Fluid Ounces: | Weight in Kilograms of: | ||||
|---|---|---|---|---|---|
| Water | Milk | Cooking Oil | All Purpose Flour | Granulated Sugar | |
| 1 fl oz | 0.03 kg | 0.03 kg | 0.026 kg | 0.016 kg | 0.025 kg |
| 2 fl oz | 0.059 kg | 0.061 kg | 0.052 kg | 0.031 kg | 0.05 kg |
| 3 fl oz | 0.089 kg | 0.091 kg | 0.078 kg | 0.047 kg | 0.075 kg |
| 4 fl oz | 0.118 kg | 0.122 kg | 0.104 kg | 0.063 kg | 0.1 kg |
| 5 fl oz | 0.148 kg | 0.152 kg | 0.13 kg | 0.078 kg | 0.125 kg |
| 6 fl oz | 0.177 kg | 0.183 kg | 0.156 kg | 0.094 kg | 0.15 kg |
| 7 fl oz | 0.207 kg | 0.213 kg | 0.182 kg | 0.11 kg | 0.175 kg |
| 8 fl oz | 0.237 kg | 0.244 kg | 0.208 kg | 0.125 kg | 0.2 kg |
| 9 fl oz | 0.266 kg | 0.274 kg | 0.234 kg | 0.141 kg | 0.225 kg |
| 10 fl oz | 0.296 kg | 0.305 kg | 0.26 kg | 0.156 kg | 0.25 kg |
| 11 fl oz | 0.325 kg | 0.335 kg | 0.286 kg | 0.172 kg | 0.275 kg |
| 12 fl oz | 0.355 kg | 0.366 kg | 0.312 kg | 0.188 kg | 0.3 kg |
| 13 fl oz | 0.384 kg | 0.396 kg | 0.338 kg | 0.203 kg | 0.325 kg |
| 14 fl oz | 0.414 kg | 0.426 kg | 0.364 kg | 0.219 kg | 0.35 kg |
| 15 fl oz | 0.444 kg | 0.457 kg | 0.39 kg | 0.235 kg | 0.375 kg |
| 16 fl oz | 0.473 kg | 0.487 kg | 0.416 kg | 0.25 kg | 0.4 kg |
| 17 fl oz | 0.503 kg | 0.518 kg | 0.442 kg | 0.266 kg | 0.425 kg |
| 18 fl oz | 0.532 kg | 0.548 kg | 0.468 kg | 0.282 kg | 0.45 kg |
| 19 fl oz | 0.562 kg | 0.579 kg | 0.494 kg | 0.297 kg | 0.475 kg |
| 20 fl oz | 0.591 kg | 0.609 kg | 0.52 kg | 0.313 kg | 0.5 kg |
When to Convert Fluid Ounces to Kilograms
Fluid ounces and kilograms are both commonly used to measure cooking ingredients.
For cooking applications, most chefs suggest measuring dry ingredients by weight rather than volume to improve accuracy in the measurements.[1] The density of dry ingredients can vary for a variety of reasons, such as compaction and clumping.
The best way to ensure an accurate conversion is to use a scale. When a scale is not available, a calculator like the one above is a good way to estimate the volume to weight conversion.
Another useful application of weight and volume conversions is chemistry. When performing chemical reactions by combining separate chemicals to produce a new chemical, one must know the exact amount of each chemical to add in order to maximize the yield of the reaction.
It is common to mix powdered chemicals with liquid, or aqueous, chemicals, and this is where it becomes very useful to convert between weights and volumes.[2]
A third application of weight and volume conversions is when shipping freight when calculating the volumetric weight for cargo and packages. Trucks, ships, and airplanes are limited in the amount of weight or volume they can transport, so if one of those quantities is known, but the limitation is on the other, then it becomes necessary to convert between the two so as not to overload the shipping vehicle.
Keep reading to learn more about each unit of measure.
What Is a Fluid Ounce?
The US fluid ounce is a unit of volume equal to 1/16 of a pint or 1/8 of a cup. The fluid ounce is sometimes referred to as just an "ounce" but should not be confused with the unit of weight. One fluid ounce is equal to approximately 29.5735 milliliters, but in nutrition labeling, one fluid ounce is rounded to exactly 30 milliliters.[3]
The fluid ounce is a US customary unit of volume. Fluid ounces can be abbreviated as fl oz, and are also sometimes abbreviated as oz fl. For example, 1 fluid ounce can be written as 1 fl oz or 1 oz fl.
Learn more about fluid ounces.
What Is a Kilogram?
One kilogram is equal to 1,000 grams, 2.204623 pounds, or 1/1,000 of a metric ton.
The formal definition of the kilogram changed in 2019. One kilogram was previously equal to the mass of the platinum-iridium bar, known as the International Prototype of the Kilogram, which was stored in Sèvres, France.
The 2019 SI brochure now defines the kilogram using the Planck constant, and it is defined using the meter and second.[4] It is equal to the mass of 1,000 cubic centimeters, or milliliters, of water.
The kilogram, or kilogramme, is the SI base unit for mass and is also a multiple of the gram. In the metric system, "kilo" is the prefix for thousands, or 103. Kilograms can be abbreviated as kg; for example, 1 kilogram can be written as 1 kg.
A kilogram is also frequently referred to as a unit of weight. While technically, a kilogram is a measure of mass, and weight is actually a measure of force, the two are equivalent as long as we are performing our calculations on Earth.
For example, an object with a mass of 1 kilogram weighs 1 kilogram on Earth, but only weighs one-sixth of that on the moon, yet still has the same mass.
Learn more about kilograms.
References
- National Institute of Standards & Technology, Culinary Measurement Tips, https://www.nist.gov/pml/owm/culinary-measurement-tips
- CK-12 Foundation, Introductory Chemistry (CK-12) - 12.6: Mass-Volume Stoichiometry, https://chem.libretexts.org/Bookshelves/Introductory_Chemistry/Introductory_Chemistry_(CK-12)/12%3A_Stoichiometry/12.06%3A_Mass-Volume_Stoichiometry
- U.S. Food & Drug Administration, Guidance for Industry: Guidelines for Determining Metric Equivalents of Household Measures, https://www.fda.gov/regulatory-information/search-fda-guidance-documents/guidance-industry-guidelines-determining-metric-equivalents-household-measures
- International Bureau of Weights and Measures, The International System of Units, 9th Edition, 2019, https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf