Convert Milligrams to Troy Ounces
1 milligram (mg) equals 0.00003215074657 troy ounces (oz t).
1 mg = 0.00003215074657 oz t
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk milligram to troy ounce converter to paste a column from Excel.
How to Convert Milligram to Troy Ounce
- 1 mg = 0.00003215074657 oz t
- 1 oz t = 31103.4768 mg
- Example: convert 15 mg to oz t: 15 mg = 15 × 0.00003215074657 oz t = 0.0004822611985 oz t
Formula
oz t = mg × 0.00003215074656863
or oz t = mg ÷ 31103.4768
Derivation from SI units:
- 1 mg = 10⁻⁶ kg = 10⁻³ g
- 1 oz t = 480 gr = 31.1034768 g (exact)
- 1 mg = 0.000001 kg ÷ 0.0311034768 kg per oz t = 0.00003215074656863 oz t
Both units are defined exactly, so the factor is exact. Milligram definition: milligram; Troy Ounce definition: troy ounce.
Worked examples
- A reading of 20 mg converts to 0.0006430149314 oz t.
20 mg × 0.00003215074657 = 0.0006430149314 oz t - A value of 250 mg is 0.008037686642 oz t.
250 mg × 0.00003215074657 = 0.008037686642 oz t
Milligram to Troy Ounce conversion table
| Milligrams (mg) | Troy Ounces (oz t) |
|---|---|
| 0.1 mg | 0.000003215074657 oz t |
| 0.5 mg | 0.00001607537328 oz t |
| 1 mg | 0.00003215074657 oz t |
| 2 mg | 0.00006430149314 oz t |
| 5 mg | 0.0001607537328 oz t |
| 10 mg | 0.0003215074657 oz t |
| 20 mg | 0.0006430149314 oz t |
| 25 mg | 0.0008037686642 oz t |
| 50 mg | 0.001607537328 oz t |
| 65 mg | 0.002089798527 oz t |
| 81 mg | 0.002604210472 oz t |
| 100 mg | 0.003215074657 oz t |
| 200 mg | 0.006430149314 oz t |
| 250 mg | 0.008037686642 oz t |
| 325 mg | 0.01044899263 oz t |
| 400 mg | 0.01286029863 oz t |
| 500 mg | 0.01607537328 oz t |
| 1000 mg | 0.03215074657 oz t |
| 2000 mg | 0.06430149314 oz t |
| 5000 mg | 0.1607537328 oz t |
Where it's used
Milligrams are used for medication doses (e.g. 500 mg tablets), while troy ounces appear in gold, silver and platinum prices. 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 troy ounces are in 1 milligram?
1 mg = 0.00003215074657 oz t.
How do I convert milligrams to troy ounces?
Multiply the value in mg by 0.00003215074657, or divide it by 31103.4768. For example, 15 mg × 0.00003215074657 = 0.0004822611985 oz t.
Is the mg to oz t 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 (troy or apothecary)".
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 Troy Ounces. Retrieved October 17, 2026, from https://scientificconverters.com/mass/milligrams-to-troy-ounces/
IEEE
Scientific Converters, "Convert Milligrams to Troy Ounces," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/mass/milligrams-to-troy-ounces/