Convert Milligrams to Troy ounces
1 milligram is 0.00003215 ozt. One milligram is exactly 0.0000321507465686 troy ounces.
One milligram is 3.2151 × 10^-5 troy ounces. To convert milligrams to troy ounces, multiply by 3.2151 × 10^-5; to go the other way, divide by 3.2151 × 10^-5 or multiply by 31103.477. The relation is exact but the figure is not: it is a rounding of a number that does not terminate, and it follows from NIST Handbook 44. One thousandth of a gram, and exactly 1,000 micrograms.
Factor checked against the defining standard · How we check
- Milligrams × 3.2151 × 10^-5
1 * 0.00003220 ozt
1 milligram in every weight unit
| Unit | Value | Exact factor |
|---|---|---|
| ounces | 0.00003527396195 oz | × 0.0000352739619496 |
| pounds | 0.000002204622622 lb | × 0.00000220462262185 |
| stone | 0.0000001574730444 st | × 0.000000157473044418 |
| US tons | 0.000000001102311311 ton | × 0.00000000110231131092 |
| micrograms | 1,000 mcg | × 1,000 |
| milligrams (as entered) | 1 mg | — |
| centigrams | 0.1 cg | × 0.1 |
| grams | 0.001 g | × 0.001 |
| kilograms | 0.000001 kg | × 0.000001 |
| slugs | 0.00000006852176586 slug | × 0.0000000685217658568 |
| tonnes | 0.000000001 t | × 0.000000001 |
| carats | 0.005 ct | × 0.005 |
| troy ounces | 0.00003215074657 ozt | × 0.0000321507465686 |
| grains | 0.01543235835 gr | × 0.0154323583529 |
| long tons | 0.0000000009842065276 LT | × 0.000000000984206527611 |
Factors are entered by hand from NIST Handbook 44 rather than derived from a units library, so the ones that terminate are exact rather than rounded.
How do you convert milligrams to troy ounces? The converter and the working
- 1.Take the measurement in milligrams.
- 2.Multiply by 3.2151 × 10^-5 — that is how many troy ounces fit in one milligram.
- 3.To go back the other way, divide by 3.2151 × 10^-5, or multiply by 31103.477.
Worked example: 25 milligrams to troy ounces
- Formula
- mg × 3.2151 × 10^-5 = ozt
- Arithmetic
- 25 × 3.2151 × 10^-5 = 0.0008038 ozt
- Answer
- 25 mg = 0.0008038 ozt
The factor is rounded for display; the figure above is computed from the full value.
Milligrams to troy ounces conversion table
| Milligrams | Troy ounces |
|---|---|
| 1 mg | 0.00003215 ozt |
| 2 mg | 0.0000643 ozt |
| 3 mg | 0.00009645 ozt |
| 4 mg | 0.0001286 ozt |
| 5 mg | 0.0001608 ozt |
| 6 mg | 0.0001929 ozt |
| 7 mg | 0.0002251 ozt |
| 8 mg | 0.0002572 ozt |
| 9 mg | 0.0002894 ozt |
| 10 mg | 0.0003215 ozt |
| 12 mg | 0.0003858 ozt |
| 15 mg | 0.0004823 ozt |
| 20 mg | 0.000643 ozt |
| 25 mg | 0.0008038 ozt |
| 50 mg | 0.001608 ozt |
| 100 mg | 0.003215 ozt |
| 200 mg | 0.01 ozt |
| 300 mg | 0.01 ozt |
| 500 mg | 0.02 ozt |
| 1000 mg | 0.03 ozt |
| 2000 mg | 0.06 ozt |
| 5000 mg | 0.16 ozt |
| 10000 mg | 0.32 ozt |
What is a milligram?
One thousandth of a gram, and exactly 1,000 micrograms. The unit almost every medicine is dosed in.
What is a troy ounce?
Exactly 31.1034768 grams, and the only ounce bullion is ever quoted in. It is about 10% heavier than the ounce on a kitchen scale, so a "pound" of gold — twelve troy ounces — is lighter than a pound of anything else.
How many troy ounces are in a milligram?
One milligram is 3.2151 × 10^-5 troy ounces. Going the other way, one troy ounce is 31103.477 milligrams. Both figures come from the same defined relation rather than from a measurement, which is why they are the same today as they were in 1959.
Every weight unit here
The whole group — 15 units with their symbols and the size of each one in kilograms — is on the conversion index, along with every pair it makes. The table above already gives each of them relative to a milligram.
Cite this page
- APA
- Rule Calculator. (2026). Convert Milligrams to troy ounces. Rule Calculator. https://rulecalculators.com/convert/milligram-to-troy-ounce
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- Chicago
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Questions people actually ask
- How many troy ounces are in a milligram?
- 3.2151 × 10^-5. Exactly 31.1034768 grams, and the only ounce bullion is ever quoted in. It is about 10% heavier than the ounce on a kitchen scale, so a "pound" of gold — twelve troy ounces — is lighter than a pound of anything else.
- How do I convert troy ounces back to milligrams?
- Divide by 3.2151 × 10^-5, or multiply by 31103.477 — they are the same operation.
Other weight conversions
Troy ounces to milligrams — the same conversion the other way.