Convert Milligram to Ounce
Convert milligrams to ounces instantly. 1 milligram = 3.527396e-5 ounce — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Ounce to Milligram converter for the reverse conversion.
Units explained
Milligram
A milligram (mg) equals one-millionth of a kilogram, or 0.001 gram.
From the SI prefix 'milli-' (from Latin 'mille', thousand).
Standard for medicine dosing, nutrition labels, and fine jewelry.
Part of the original metric system of 1795.
Ounce
The (avoirdupois) ounce (oz) equals one-sixteenth of a pound, about 28.35 grams.
From Latin 'uncia', meaning a twelfth part.
US food portions, postal weights, and boxing weight classes.
Standardized as 1/16 of the international pound from 1959.
Milligram to Ounce conversion formula
The relationship between milligrams and ounces:
To convert milligrams to ounces, multiply the value in milligrams by 3.527396e-5. To reverse, multiply ounces by 28349.5231.
How to use this converter
Type a value into the calculator. The result in ounces updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Ounce to Milligram converter for the reverse direction.
Step-by-step: convert milligrams to ounces
- Write down the value in milligrams (mg).
- Multiply that value by the factor 3.527396e-5.
- The product is the equivalent value in ounces (oz).
- To reverse, multiply the ounce value by 28349.5231.
Worked examples
Example 1 — Convert 1 mg to oz:
1 × 3.527396e-5 = 3.527396e-5 oz
Example 2 — Convert 100 mg to oz:
100 × 3.527396e-5 = 0.0035273962 oz
Real-world example — Packaging gauge
A 4-milligram plastic bag thickness is a common spec for grocery and freezer bags. Converting from milligrams to ounces is what packaging buyers do whenever they bridge US and metric supplier quotes.
4 mg × 3.527396e-5 = 0.0001410958 oz
Real-world example — Plastic film and laminate thickness
A 500-milligram sheet is a typical spec for ID-card laminates and film overlays. Converting to ounces aligns the value with the unit most CAD systems and material datasheets prefer.
500 mg × 3.527396e-5 = 0.017636981 oz
Milligram to Ounce conversion table
Standard reference values for converting milligrams to ounces:
| Milligram [mg] | Ounce [oz] |
|---|---|
| 0.01 | 3.527396e-7 |
| 0.1 | 3.527396e-6 |
| 1 | 3.527396e-5 |
| 2 | 7.054792e-5 |
| 3 | 0.0001058219 |
| 4 | 0.0001410958 |
| 5 | 0.0001763698 |
| 10 | 0.0003527396 |
| 20 | 0.0007054792 |
| 30 | 0.0010582189 |
| 40 | 0.0014109585 |
| 50 | 0.0017636981 |
| 100 | 0.0035273962 |
| 500 | 0.017636981 |
| 1000 | 0.035273962 |
Frequently asked questions
How many ounces is 1 milligram?
How do I convert milligrams to ounces?
How do I convert ounces back to milligrams?
How many ounces is 100 milligrams?
Popular weight unit conversions
Convert Milligram to other weight units
Show all Milligram conversions
Metric / SI (17 units)
Avoirdupois (15 units)
Troy & Apothecary (10 units)
Indian / South Asian (6 units)
Scientific / Atomic (9 units)
Astronomical (4 units)
Biblical / Ancient (14 units)
Sources & references
Conversion factor (1 mg = 3.527396e-5 oz) verified against the following authoritative sources:
- BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
- NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
- NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
- NIST — Refinement of values for the yard and pound (Federal Register 1959)
The treaty (signed by US
- International Astronomical Union — System of Astronomical Constants
The IAU defines astronomical units including the AU (149597870700 m exactly) light-year and parsec used in astronomy and astrophysics.