Milligram is 0.001 gram units.
Milligrams to Ounces Converter — mg to oz
Convert Milligram (mg) to Ounce (oz) using the exact conversion factor (1 milligram = 0.000035274 ounce). See the formula, worked examples, conversion table, history, and common uses.
Milligrams to Ounces converter
Converter
Cooking Converter
Convert cooking volume and mass units used in recipes and nutrition workflows.
Context values
Some unit families need one extra value for a physically accurate result.
An avoirdupois ounce is 1/16 pound.
Result = input x 1e-6 / 0.02834952313.
Mass units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Milligrams to Ounces
Milligram and Ounce both show up in recipes, and converting between them matters whenever a recipe from one country's cookbook needs to be followed with another country's measuring tools. Specifically: Milligram is 0.001 gram units, and an avoirdupois ounce is 1/16 pound.
Formula
ounces = milligrams × 0.0000352739619496
This factor comes from each unit's defined relationship to the category's base unit: 1 milligram equals 0.000001 base units, and 1 ounce equals 0.028349523125 base units, so dividing one by the other gives the direct milligram-to-ounce factor of 0.0000352739619496.
Simple example
1 mg × 0.00003527396195 = 0.000035274 oz
1 milligram = 0.000035274 ounces.
Real-world example
2 mg × 0.00003527396195 = 0.0000705479 oz
2 milligrams = 0.0000705479 ounces.
Conversion table
| Milligram (mg) | Ounce (oz) |
|---|---|
| 0.25 mg | 0.0000088185 oz |
| 0.5 mg | 0.000017637 oz |
| 1 mg | 0.000035274 oz |
| 2 mg | 0.0000705479 oz |
| 4 mg | 0.0001410958 oz |
| 8 mg | 0.0002821917 oz |
Reverse conversion: Ounce to Milligram
0.000035274 oz × 28349.52313 = 1.000001079 mg
0.000035274 ounces = 1.000001079 milligrams.
milligrams = ounces × 28349.523125
For a page dedicated to this direction, see Ounce to Milligram.
Understanding the Milligram (mg)
Milligram is 0.001 gram units.
Understanding the Ounce
Ounce (oz) measures mass. The avoirdupois ounce is 1/16 of a pound: exactly 28.349523125 grams. It is classified as a US/imperial customary unit.
Where it's used: United States (cooking, postal, retail) United Kingdom (informal/retail use)
Avoirdupois ounce vs. troy ounce. The everyday ounce (avoirdupois, 28.35 g) used for cooking and shipping is a different, smaller unit than the troy ounce (31.10 g) used for precious metals like gold and silver — this page uses the everyday avoirdupois ounce.
Uses of the Ounce today
- US cooking and recipe measurement (small quantities)
- US postal and shipping weight
- Precious metals (troy ounce, a related but distinct unit)
History of the Ounce
The ounce descends from the Roman 'uncia' (a twelfth part), inherited through medieval English weight systems; the avoirdupois ounce (for general goods, as opposed to the troy ounce for precious metals) became standard for everyday trade, fixed at exactly 28.349523125 g via the pound's 1959 international standardization.
Historical origin. Ounce was not the invention of a single named person; it developed through the process described above.
Ounce — sources
- NIST — International yard and pound (1959) — Basis for the modern ounce via the standardized pound.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many ounces are in 1 milligram?
1 milligram equals 0.000035274 ounces, using the exact defined conversion factor rather than an estimate.
How do I convert milligram to ounce?
Multiply the milligram value by 0.00003527396195. The converter above does this instantly to whatever precision you set.
How do I convert ounce back to milligram?
Use the reverse factor: 1 ounce equals 28,349.52313 milligrams. You can also use the swap control in the converter above to flip the direction instantly.
What is a milligram?
Milligram (mg) is a unit of cooking.
What is a ounce?
Ounce (oz) measures mass. The avoirdupois ounce is 1/16 of a pound: exactly 28.349523125 grams. It is classified as a US/imperial customary unit.
Is the milligram to ounce conversion exact?
Yes. The avoirdupois ounce is 1/16 of a pound: exactly 28.349523125 grams. That fixed definition is what the converter above uses, so any rounding you see is a display choice, not a limitation of the math.
What is the difference between avoirdupois ounce vs. troy ounce?
The everyday ounce (avoirdupois, 28.35 g) used for cooking and shipping is a different, smaller unit than the troy ounce (31.10 g) used for precious metals like gold and silver — this page uses the everyday avoirdupois ounce.