A troy ounce is exactly 31.1034768 grams.
Troy ounces to Milligrams Converter — oz t to mg
Convert Troy ounce (oz t) to Milligram (mg) using the exact conversion factor (1 troy ounce = 31,103.4768 milligram). See the formula, worked examples, and conversion table.
Troy ounces to Milligrams converter
Converter
Mass/Weight Converter
Convert SI mass, imperial weight, jewelry, atomic, and astronomy mass units.
Context values
Some unit families need one extra value for a physically accurate result.
Milligram is 0.001 gram units.
Result = input x 0.0311034768 / 1e-6.
Mass uses the kilogram as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Troy ounces to Milligrams
Weight conversions between Troy ounce and Milligram come up constantly in everyday commerce, shipping, and cooking, since US packaging is usually labeled in pounds while most of the rest of the world uses kilograms. Specifically: A troy ounce is exactly 31.1034768 grams, and milligram is 0.001 gram units.
Formula
milligrams = troy ounces × 31103.4768
This factor comes from each unit's defined relationship to the category's base unit: 1 troy ounce equals 0.0311034768 base units, and 1 milligram equals 0.000001 base units, so dividing one by the other gives the direct troy ounce-to-milligram factor of 31103.4768.
Simple example
1 oz t × 31103.4768 = 31,103.4768 mg
1 troy ounce = 31,103.4768 milligrams.
Real-world example
50 oz t × 31103.4768 = 1,555,173.84 mg
50 troy ounces = 1,555,173.84 milligrams.
Conversion table
| Troy ounce (oz t) | Milligram (mg) |
|---|---|
| 1 oz t | 31,103.4768 mg |
| 5 oz t | 155,517.384 mg |
| 10 oz t | 311,034.768 mg |
| 25 oz t | 777,586.92 mg |
| 50 oz t | 1,555,173.84 mg |
| 100 oz t | 3,110,347.68 mg |
Reverse conversion: Milligram to Troy ounce
1 mg × 0.00003215074657 = 0.0000321507 oz t
1 milligram = 0.0000321507 troy ounces.
troy ounces = milligrams × 0.0000321507465686
For a page dedicated to this direction, see Milligram to Troy ounce.
Understanding the Troy ounce (oz t)
A troy ounce is exactly 31.1034768 grams.
Understanding the Milligram (mg)
Milligram is 0.001 gram units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many milligrams are in 1 troy ounce?
1 troy ounce equals 31,103.4768 milligrams, using the exact defined conversion factor rather than an estimate.
How do I convert troy ounce to milligram?
Multiply the troy ounce value by 31103.4768. The converter above does this instantly to whatever precision you set.
How do I convert milligram back to troy ounce?
Use the reverse factor: 1 milligram equals 0.0000321507 troy ounces. You can also use the swap control in the converter above to flip the direction instantly.
What is a troy ounce?
Troy ounce (oz t) is a unit of mass/weight.
What is a milligram?
Milligram (mg) is a unit of mass/weight.
Is the troy ounce to milligram conversion exact?
Yes. Both troy ounce and milligram are defined by fixed standards rather than physical artifacts, so the factor of 31103.4768 used above is exact to as many digits as you choose to display.