Fluid Ounces to Milligrams Conversion Calculator

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

fl oz
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Result in Milligrams:

1 fl oz = 29,573.5295625 mg
29.57353 g
Learn how we calculate this below

Do you want to convert milligrams to fluid ounces?

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How to Convert Fluid Ounces to Milligrams

Since fluid ounces are a unit of volume and milligrams 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 milligrams 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 Milligrams Formula

To convert a measurement in fluid ounces to milligrams, multiply the volume by the density of the ingredient or material. Note that in order for this to work, the density must be in milligrams per fluid ounce (mg/fl oz).

If the density is given in grams per milliliter (g/mL), then first multiply the density by 29,573.53 to convert to mg/fl oz.

For a density given in g/mL, you can use this simple formula to convert:

milligrams = fluid ounces × 29,573.53 × density

Thus, the weight in milligrams is equal to the volume in fluid ounces multiplied by 29,573.53 times the density (in g/mL) of the ingredient, substance, 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.

milligrams = 5 fl oz × 29,573.53 × 0.7 g/mL = 103,507.353 mg

When to Convert Fluid Ounces to Milligrams

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 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]

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 cooking and baking ingredients.
Volume in Fluid Ounces: Weight in Milligrams of:
WaterMilkCooking OilAll Purpose FlourGranulated Sugar
0.01 fl oz295.74 mg304.61 mg260.25 mg156.44 mg208.49 mg
0.02 fl oz591.47 mg609.21 mg520.49 mg312.89 mg416.99 mg
0.03 fl oz887.21 mg913.82 mg780.74 mg469.33 mg625.48 mg
0.04 fl oz1,183 mg1,218 mg1,041 mg625.78 mg833.97 mg
0.05 fl oz1,479 mg1,523 mg1,301 mg782.22 mg1,042 mg
0.06 fl oz1,774 mg1,828 mg1,561 mg938.66 mg1,251 mg
0.07 fl oz2,070 mg2,132 mg1,822 mg1,095 mg1,459 mg
0.08 fl oz2,366 mg2,437 mg2,082 mg1,252 mg1,668 mg
0.09 fl oz2,662 mg2,741 mg2,342 mg1,408 mg1,876 mg
0.1 fl oz2,957 mg3,046 mg2,602 mg1,564 mg2,085 mg
0.11 fl oz3,253 mg3,351 mg2,863 mg1,721 mg2,293 mg
0.12 fl oz3,549 mg3,655 mg3,123 mg1,877 mg2,502 mg
0.13 fl oz3,845 mg3,960 mg3,383 mg2,034 mg2,710 mg
0.14 fl oz4,140 mg4,265 mg3,643 mg2,190 mg2,919 mg
0.15 fl oz4,436 mg4,569 mg3,904 mg2,347 mg3,127 mg
0.16 fl oz4,732 mg4,874 mg4,164 mg2,503 mg3,336 mg
0.17 fl oz5,028 mg5,178 mg4,424 mg2,660 mg3,544 mg
0.18 fl oz5,323 mg5,483 mg4,684 mg2,816 mg3,753 mg
0.19 fl oz5,619 mg5,788 mg4,945 mg2,972 mg3,961 mg
0.2 fl oz5,915 mg6,092 mg5,205 mg3,129 mg4,170 mg
0.21 fl oz6,210 mg6,397 mg5,465 mg3,285 mg4,378 mg
0.22 fl oz6,506 mg6,701 mg5,725 mg3,442 mg4,587 mg
0.23 fl oz6,802 mg7,006 mg5,986 mg3,598 mg4,795 mg
0.24 fl oz7,098 mg7,311 mg6,246 mg3,755 mg5,004 mg
0.25 fl oz7,393 mg7,615 mg6,506 mg3,911 mg5,212 mg
0.26 fl oz7,689 mg7,920 mg6,766 mg4,068 mg5,421 mg
0.27 fl oz7,985 mg8,224 mg7,027 mg4,224 mg5,629 mg
0.28 fl oz8,281 mg8,529 mg7,287 mg4,380 mg5,838 mg
0.29 fl oz8,576 mg8,834 mg7,547 mg4,537 mg6,046 mg
0.3 fl oz8,872 mg9,138 mg7,807 mg4,693 mg6,255 mg
0.31 fl oz9,168 mg9,443 mg8,068 mg4,850 mg6,463 mg
0.32 fl oz9,464 mg9,747 mg8,328 mg5,006 mg6,672 mg
0.33 fl oz9,759 mg10,052 mg8,588 mg5,163 mg6,880 mg
0.34 fl oz10,055 mg10,357 mg8,848 mg5,319 mg7,089 mg
0.35 fl oz10,351 mg10,661 mg9,109 mg5,476 mg7,297 mg
0.36 fl oz10,646 mg10,966 mg9,369 mg5,632 mg7,506 mg
0.37 fl oz10,942 mg11,270 mg9,629 mg5,788 mg7,714 mg
0.38 fl oz11,238 mg11,575 mg9,889 mg5,945 mg7,923 mg
0.39 fl oz11,534 mg11,880 mg10,150 mg6,101 mg8,131 mg
0.4 fl oz11,829 mg12,184 mg10,410 mg6,258 mg8,340 mg

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 Milligram?

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

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

A milligram is also frequently referred to as a unit of weight. While technically, a milligram 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 milligram weighs 1 milligram on Earth, but only weighs one-sixth of that on the moon, yet still has the same mass.

Learn more about milligrams.

Fluid Ounce to Milligram Conversion Table

Fluid ounce measurements converted to milligrams for commonly used cooking and baking ingredients.
Volume in Fluid Ounces: Weight in Milligrams of:
WaterMilkCooking OilAll Purpose FlourGranulated Sugar
0.01 fl oz295.74 mg304.61 mg260.25 mg156.44 mg208.49 mg
0.02 fl oz591.47 mg609.21 mg520.49 mg312.89 mg416.99 mg
0.03 fl oz887.21 mg913.82 mg780.74 mg469.33 mg625.48 mg
0.04 fl oz1,183 mg1,218 mg1,041 mg625.78 mg833.97 mg
0.05 fl oz1,479 mg1,523 mg1,301 mg782.22 mg1,042 mg
0.06 fl oz1,774 mg1,828 mg1,561 mg938.66 mg1,251 mg
0.07 fl oz2,070 mg2,132 mg1,822 mg1,095 mg1,459 mg
0.08 fl oz2,366 mg2,437 mg2,082 mg1,252 mg1,668 mg
0.09 fl oz2,662 mg2,741 mg2,342 mg1,408 mg1,876 mg
0.1 fl oz2,957 mg3,046 mg2,602 mg1,564 mg2,085 mg
0.11 fl oz3,253 mg3,351 mg2,863 mg1,721 mg2,293 mg
0.12 fl oz3,549 mg3,655 mg3,123 mg1,877 mg2,502 mg
0.13 fl oz3,845 mg3,960 mg3,383 mg2,034 mg2,710 mg
0.14 fl oz4,140 mg4,265 mg3,643 mg2,190 mg2,919 mg
0.15 fl oz4,436 mg4,569 mg3,904 mg2,347 mg3,127 mg
0.16 fl oz4,732 mg4,874 mg4,164 mg2,503 mg3,336 mg
0.17 fl oz5,028 mg5,178 mg4,424 mg2,660 mg3,544 mg
0.18 fl oz5,323 mg5,483 mg4,684 mg2,816 mg3,753 mg
0.19 fl oz5,619 mg5,788 mg4,945 mg2,972 mg3,961 mg
0.2 fl oz5,915 mg6,092 mg5,205 mg3,129 mg4,170 mg
0.21 fl oz6,210 mg6,397 mg5,465 mg3,285 mg4,378 mg
0.22 fl oz6,506 mg6,701 mg5,725 mg3,442 mg4,587 mg
0.23 fl oz6,802 mg7,006 mg5,986 mg3,598 mg4,795 mg
0.24 fl oz7,098 mg7,311 mg6,246 mg3,755 mg5,004 mg
0.25 fl oz7,393 mg7,615 mg6,506 mg3,911 mg5,212 mg
0.26 fl oz7,689 mg7,920 mg6,766 mg4,068 mg5,421 mg
0.27 fl oz7,985 mg8,224 mg7,027 mg4,224 mg5,629 mg
0.28 fl oz8,281 mg8,529 mg7,287 mg4,380 mg5,838 mg
0.29 fl oz8,576 mg8,834 mg7,547 mg4,537 mg6,046 mg
0.3 fl oz8,872 mg9,138 mg7,807 mg4,693 mg6,255 mg
0.31 fl oz9,168 mg9,443 mg8,068 mg4,850 mg6,463 mg
0.32 fl oz9,464 mg9,747 mg8,328 mg5,006 mg6,672 mg
0.33 fl oz9,759 mg10,052 mg8,588 mg5,163 mg6,880 mg
0.34 fl oz10,055 mg10,357 mg8,848 mg5,319 mg7,089 mg
0.35 fl oz10,351 mg10,661 mg9,109 mg5,476 mg7,297 mg
0.36 fl oz10,646 mg10,966 mg9,369 mg5,632 mg7,506 mg
0.37 fl oz10,942 mg11,270 mg9,629 mg5,788 mg7,714 mg
0.38 fl oz11,238 mg11,575 mg9,889 mg5,945 mg7,923 mg
0.39 fl oz11,534 mg11,880 mg10,150 mg6,101 mg8,131 mg
0.4 fl oz11,829 mg12,184 mg10,410 mg6,258 mg8,340 mg

References

  1. National Institute of Standards & Technology, Culinary Measurement Tips, https://www.nist.gov/pml/owm/culinary-measurement-tips
  2. 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
  3. 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

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