Fluid Ounces to Milligrams Conversion Calculator

Enter the volume in fluid ounces below to calculate the weight in milligrams.

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Results in Milligrams:
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1 fl oz = 29,573.5295625 mg
29.57353 g

How to Convert Fluid Ounces to Milligrams

Scales are used to measure weight

To convert a fluid ounce measurement to a milligram measurement, multiply the volume by 29,573.52956 times the density of the ingredient or material.

You can use this simple formula to convert:

milligrams = fluid ounces × 29,573.52956 × ingredient density

Thus, the volume in milligrams is equal to the fluid ounces multiplied by 29,573.52956 times the density of the ingredient or material.

For example, here's how to convert 5 fluid ounces to milligrams for an ingredient with a density of 0.7 g/mL.
5 fl oz = 5 × 29,573.52956 × 0.7 = 103,507.35347 mg

Fluid ounces and milligrams 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.

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.

Keep reading to learn more about each unit of measure.

How Many Milligrams are in a Fluid Ounce?

The actual weight of a fluid ounce will vary depending on the density of the material. The table below shows how many milligrams of various wet and dry ingredients are in a fluid ounce.

Fluid ounce measurements converted to milligrams for commonly used ingredients.
Volume in Fluid Ounces: Weight in Milligrams of:
Water Milk Cooking Oil All Purpose Flour Granulated Sugar
0.01 fl oz 295.74 mg 307.56 mg 260.25 mg 156.44 mg 207.01 mg
0.02 fl oz 591.47 mg 615.13 mg 520.49 mg 312.89 mg 414.03 mg
0.03 fl oz 887.21 mg 922.69 mg 780.74 mg 469.33 mg 621.04 mg
0.04 fl oz 1,183 mg 1,230 mg 1,041 mg 625.78 mg 828.06 mg
0.05 fl oz 1,479 mg 1,538 mg 1,301 mg 782.22 mg 1,035 mg
0.06 fl oz 1,774 mg 1,845 mg 1,561 mg 938.66 mg 1,242 mg
0.07 fl oz 2,070 mg 2,153 mg 1,822 mg 1,095 mg 1,449 mg
0.08 fl oz 2,366 mg 2,461 mg 2,082 mg 1,252 mg 1,656 mg
0.09 fl oz 2,662 mg 2,768 mg 2,342 mg 1,408 mg 1,863 mg
0.1 fl oz 2,957 mg 3,076 mg 2,602 mg 1,564 mg 2,070 mg
0.11 fl oz 3,253 mg 3,383 mg 2,863 mg 1,721 mg 2,277 mg
0.12 fl oz 3,549 mg 3,691 mg 3,123 mg 1,877 mg 2,484 mg
0.13 fl oz 3,845 mg 3,998 mg 3,383 mg 2,034 mg 2,691 mg
0.14 fl oz 4,140 mg 4,306 mg 3,643 mg 2,190 mg 2,898 mg
0.15 fl oz 4,436 mg 4,613 mg 3,904 mg 2,347 mg 3,105 mg
0.16 fl oz 4,732 mg 4,921 mg 4,164 mg 2,503 mg 3,312 mg
0.17 fl oz 5,028 mg 5,229 mg 4,424 mg 2,660 mg 3,519 mg
0.18 fl oz 5,323 mg 5,536 mg 4,684 mg 2,816 mg 3,726 mg
0.19 fl oz 5,619 mg 5,844 mg 4,945 mg 2,972 mg 3,933 mg
0.2 fl oz 5,915 mg 6,151 mg 5,205 mg 3,129 mg 4,140 mg
0.21 fl oz 6,210 mg 6,459 mg 5,465 mg 3,285 mg 4,347 mg
0.22 fl oz 6,506 mg 6,766 mg 5,725 mg 3,442 mg 4,554 mg
0.23 fl oz 6,802 mg 7,074 mg 5,986 mg 3,598 mg 4,761 mg
0.24 fl oz 7,098 mg 7,382 mg 6,246 mg 3,755 mg 4,968 mg
0.25 fl oz 7,393 mg 7,689 mg 6,506 mg 3,911 mg 5,175 mg
0.26 fl oz 7,689 mg 7,997 mg 6,766 mg 4,068 mg 5,382 mg
0.27 fl oz 7,985 mg 8,304 mg 7,027 mg 4,224 mg 5,589 mg
0.28 fl oz 8,281 mg 8,612 mg 7,287 mg 4,380 mg 5,796 mg
0.29 fl oz 8,576 mg 8,919 mg 7,547 mg 4,537 mg 6,003 mg
0.3 fl oz 8,872 mg 9,227 mg 7,807 mg 4,693 mg 6,210 mg
0.31 fl oz 9,168 mg 9,535 mg 8,068 mg 4,850 mg 6,417 mg
0.32 fl oz 9,464 mg 9,842 mg 8,328 mg 5,006 mg 6,624 mg
0.33 fl oz 9,759 mg 10,150 mg 8,588 mg 5,163 mg 6,831 mg
0.34 fl oz 10,055 mg 10,457 mg 8,848 mg 5,319 mg 7,039 mg
0.35 fl oz 10,351 mg 10,765 mg 9,109 mg 5,476 mg 7,246 mg
0.36 fl oz 10,646 mg 11,072 mg 9,369 mg 5,632 mg 7,453 mg
0.37 fl oz 10,942 mg 11,380 mg 9,629 mg 5,788 mg 7,660 mg
0.38 fl oz 11,238 mg 11,687 mg 9,889 mg 5,945 mg 7,867 mg
0.39 fl oz 11,534 mg 11,995 mg 10,150 mg 6,101 mg 8,074 mg
0.4 fl oz 11,829 mg 12,303 mg 10,410 mg 6,258 mg 8,281 mg

Fluid Ounces

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 an "ounce" but should not be confused with the unit of mass. One fluid ounce is equal to just under 29.6 milliliters, but in nutrition labeling, one fluid ounce is rounded to exactly 30 milliliters.[2]

The fluid ounce is a US customary unit of volume. Fluid ounces can be abbreviated as fl oz, and are also sometimes abbreviated as fl. oz. or oz. fl.. For example, 1 fluid ounce can be written as 1 fl oz, 1 fl. oz., or 1 oz. fl..

Milligrams

The milligram is the mass equal to 1/1,000 of a gram, or 0.0154 grains.

The milligram, or milligramme, is an SI unit of weight in the metric system. In the metric system, "milli" is the prefix for 10-3. Milligrams can be abbreviated as mg; for example, 1 milligram can be written as 1 mg.

References

  1. National Institute of Standards & Technology, Metric Cooking Resources, https://www.nist.gov/pml/weights-and-measures/metric-cooking-resources
  2. 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