Milligrams to Ounces Converter
Enter the weight in milligrams below to convert it to ounces.
Convert Milligrams to Ounces
Enter a value in milligrams (mg) to convert to ounces (oz).
Milligram to Ounce Conversion Table
Table showing various milligram measurements converted to ounces. Click any preset value or arrow to load it into the converter.
| Milligrams (mg) | Ounces (oz) |
|---|---|
| 1 mg | 0.000035274 oz |
| 2 mg | 0.000070548 oz |
| 2.5 mg | 0.000088185 oz |
| 5 mg | 0.00017637 oz |
| 10 mg | 0.00035274 oz |
| 15 mg | 0.000529109 oz |
| 20 mg | 0.000705479 oz |
| 25 mg | 0.000881849 oz |
| 30 mg | 0.0010582 oz |
| 50 mg | 0.0017637 oz |
How to Convert Milligrams to Ounces
To convert milligrams to ounces, multiply the weight by the following conversion ratio: 0.000035274 ounces/milligram.
Since one milligram is equal to 0.000035274 ounces, you can use this simple formula to convert:
The weight in ounces is equal to the weight in milligrams multiplied by 0.000035274.
For example, here's how to convert 5 milligrams to ounces using the formula above.
How Many Ounces Are in a Milligram?
There are 0.000035274 ounces in a milligram, which is why we use this value in the formula above.
Our milligram to ounce calculator automatically converts your weight measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Milligrams and ounces are both units used to measure weight. Keep reading to learn more about each unit.
What Is a Milligram?
A milligram is a unit of weight equal to 1/1,000,000 of a kilogram (0.000001 kg). One-thousandth of a gram (10⁻⁶ kg). [1]
The milligram is classified as a metric and SI-compatible unit of weight. Milligrams can be abbreviated as mg; for example, 1 milligram can be written as 1 mg.
In the metric system, "milli" is the standard SI prefix for thousandths, or 10⁻³. This makes the milligram (mg) a convenient decimal multiple of the gram (g).
In practice, milligrams (mg) are widely used across fine-tolerance laboratory, analytical, and micro-scale weight measurements within SI metric workflows, engineering documentation, and technical data sheets.
What Is an Ounce?
An ounce is a unit of weight equal to 0.0283495 kilograms (kg), the base unit for weight. Equal to 1/16 of a pound (approx. 28.3495 grams). [2]
The ounce is classified as a US customary and imperial unit of weight. Ounces can be abbreviated as oz; for example, 1 ounce can be written as 1 oz.
When working with ounces (oz) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, ounces (oz) are widely used across standard weight applications within US customary and imperial workflows, engineering documentation, and technical data sheets.
When converting weight between milligrams (mg) and ounces (oz), keep full floating-point precision (1 mg = 0.000035274 oz; 1 oz = 28,349.523125 mg) during intermediate calculations and round only the final ounce figure to match your instrument tolerance.
More Milligram & Ounce Conversions
Need to calculate in the opposite direction? Use our ounces to milligrams calculator to switch your starting unit immediately. You can also explore related tools such as converting ounces to milligrams, converting grams to ounces, or converting pounds to ounces.
Convert from Milligrams
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Frequently Asked Questions
References
- [1]NIST OWM StandardNIST OWM (SI Units — Mass)·Mass & Weight Metrology Standard — Milligrams (mg) to Ounces (oz)
- [2]NIST HB 44 SpecificationNIST HB 44 (NIST Handbook 44 (Current Ed.))·Unit Specifications: Milligram (mg) & Ounce (oz)
- [3]BIPM ReferenceBIPM (SI Base Unit: Kilogram (kg))·Conversion Factors & Mathematical Basis (mg to oz)