Convert Milligrams to Ounces
1 milligram (mg) equals 0.00003527396195 ounces (oz).
1 mg = 0.00003527396195 oz
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk milligram to ounce converter to paste a column from Excel.
How to Convert Milligram to Ounce
- 1 mg = 0.00003527396195 oz
- 1 oz = 28349.52313 mg
- Example: convert 15 mg to oz: 15 mg = 15 × 0.00003527396195 oz = 0.0005291094292 oz
Reference conditions. oz: Avoirdupois system: 1 lb = 16 oz = 7000 grains = 0.45359237 kg exactly (1959 agreement).
Formula
oz = mg × 0.00003527396194958
or oz = mg ÷ 28349.523125
Derivation from SI units:
- 1 mg = 10⁻⁶ kg = 10⁻³ g
- 1 oz = 1/16 lb = 28.349523125 g (exact)
- 1 mg = 0.000001 kg ÷ 0.028349523125 kg per oz = 0.00003527396194958 oz
Both units are defined exactly, so the factor is exact. Milligram definition: milligram; Ounce definition: ounce.
Worked examples
- A reading of 20 mg converts to 0.000705479239 oz.
20 mg × 0.00003527396195 = 0.000705479239 oz - A value of 250 mg is 0.008818490487 oz.
250 mg × 0.00003527396195 = 0.008818490487 oz
Milligram to Ounce conversion table
| Milligrams (mg) | Ounces (oz) |
|---|---|
| 0.1 mg | 0.000003527396195 oz |
| 0.5 mg | 0.00001763698097 oz |
| 1 mg | 0.00003527396195 oz |
| 2 mg | 0.0000705479239 oz |
| 5 mg | 0.0001763698097 oz |
| 10 mg | 0.0003527396195 oz |
| 20 mg | 0.000705479239 oz |
| 25 mg | 0.0008818490487 oz |
| 50 mg | 0.001763698097 oz |
| 65 mg | 0.002292807527 oz |
| 81 mg | 0.002857190918 oz |
| 100 mg | 0.003527396195 oz |
| 200 mg | 0.00705479239 oz |
| 250 mg | 0.008818490487 oz |
| 325 mg | 0.01146403763 oz |
| 400 mg | 0.01410958478 oz |
| 500 mg | 0.01763698097 oz |
| 1000 mg | 0.03527396195 oz |
| 2000 mg | 0.0705479239 oz |
| 5000 mg | 0.1763698097 oz |
Where it's used
Milligrams are used for medication doses (e.g. 500 mg tablets), while ounces appear in food and parcel weights in the US. Both measure mass (commonly called weight), so the conversion is a fixed factor.
Milligram to other weight and mass units
| Conversion | 1 mg equals |
|---|---|
| milligram to kilogram | 0.000001 kg |
| milligram to gram | 0.001 g |
| milligram to microgram | 1000 µg |
| milligram to metric ton | 1 × 10⁻⁹ t |
| milligram to pound | 0.000002204622622 lb |
| milligram to ounce | 0.00003527396195 oz |
| milligram to stone | 1.574730444 × 10⁻⁷ st |
| milligram to short ton | 1.102311311 × 10⁻⁹ ton (US) |
| milligram to long ton | 9.842065276 × 10⁻¹⁰ ton (UK) |
| milligram to grain | 0.01543235835 gr |
| milligram to troy ounce | 0.00003215074657 oz t |
| milligram to carat | 0.005 ct |
Frequently asked questions
How many ounces are in 1 milligram?
1 mg = 0.00003527396195 oz.
How do I convert milligrams to ounces?
Multiply the value in mg by 0.00003527396195, or divide it by 28349.52313. For example, 15 mg × 0.00003527396195 = 0.0005291094292 oz.
Is the mg to oz conversion exact?
Yes. Both units are defined exactly, so the ratio is exact; its decimal form does not terminate and is shown here to 10 significant figures (more with the precision selector).
Sources
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 7, SI prefixes.
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "ounce (avoirdupois) (oz)".
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Milligrams to Ounces. Retrieved October 17, 2026, from https://scientificconverters.com/mass/milligrams-to-ounces/
IEEE
Scientific Converters, "Convert Milligrams to Ounces," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/mass/milligrams-to-ounces/