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Ounces to Milligrams (oz to mg) Converter

1 ounce (oz) = 28,349.5 milligrams (mg). To convert ounces to milligrams, multiply by 28,349.5: 8 oz × 28,349.5 = 226,796 mg.

1 oz = 28349.523125 mg
Convert the other way: Milligrams to Ounces

Quick facts

How to convert ounces to milligrams

  1. Take the value in ounces.
  2. Multiply it by 28,349.5 (the number of milligrams in one ounce).
  3. Round the result to the precision you need.
mg = oz × 28,349.5

Worked example (a steak): 8 oz × 28,349.5 = 226796 mg.

To convert milligrams back to ounces, multiply by 0.000035274, or divide by 28,349.5.

Source: NIST Special Publication 811 (2008), Appendix B (1 pound = 0.45359237 kg exactly). Tola, seer and maund use the standard values given in their definitions on this page.

Ounces to Milligrams conversion table

Ounces to Milligrams conversion table
Ounces [oz]Milligrams [mg]
0.001 oz28.349523125 mg
0.01 oz283.49523125 mg
0.1 oz2834.9523125 mg
0.5 oz14174.7615625 mg
1 oz28349.523125 mg
2 oz56699.04625 mg
5 oz141747.615625 mg
10 oz283495.2312500001 mg

oz to mg chart from 1 to 100

Milligrams to Ounces conversion table

Milligrams to Ounces conversion table
Milligrams [mg]Ounces [oz]
1 mg0.000035274 oz
10 mg0.0003527396 oz
100 mg0.0035273962 oz
1000 mg0.0352739619 oz
10000 mg0.3527396195 oz
100000 mg3.527396195 oz
1000000 mg35.2739619496 oz

Ounces vs Milligrams

OunceMilligram
Symbolozmg
Equals1 oz = 28,349.5 mg1 mg = 0.000035274 oz

What is an ounce?

A US customary and imperial unit equal to 1/16 of a pound. Used in the US for food packaging and postage weight.

What is a milligram?

One thousandth of a gram. Used for medication dosages and precise lab measurements.

Frequently asked questions

How many milligrams are in an ounce?

There are 28,349.5 milligrams in 1 ounce (1 oz = 28349.523125 mg).

How many ounces are in a milligram?

There are 0.000035274 ounces in 1 milligram (1 mg = 0.000035274 oz).

How do I convert ounces to milligrams?

Multiply the number of ounces by 28,349.5. For example, 10 oz × 28,349.5 = 283,495 mg. To convert back, multiply by 0.000035274.

What is 10 oz in milligrams?

10 oz = 283,495 mg.

What is 100 oz in milligrams?

100 oz = 2,834,952 mg.

Is the conversion exact?

Yes. The factor comes from the official definitions of both units (NIST Special Publication 811 (2008), Appendix B (1 pound = 0.45359237 kg exactly). Tola, seer and maund use the standard values given in their definitions on this page). Results are shown to up to 10 decimal places; round them to suit your purpose.

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Reviewed by

Dr. Muhammad Amjad Khadim PhD Mathematics

Dr. Muhammad Amjad Khadim holds a PhD in Mathematics. He writes and reviews the guides on pakmath.com and checks every formula, conversion factor and worked example against published standards and official guidance before it goes live. Spotted an error? Tell us and it will be corrected.

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First published 28 October 2026 · Last reviewed 5 November 2026