Troy Ounces to Milligrams Converter
Enter the weight in troy ounces below to convert it to milligrams.
Convert Troy Ounces to Milligrams
Enter a value in troy ounces (oz t) to convert to milligrams (mg).
Troy Ounce to Milligram Conversion Table
Table showing various troy ounce measurements converted to milligrams. Click any preset value or arrow to load it into the converter.
| Troy Ounces (oz t) | Milligrams (mg) |
|---|---|
| 1 oz t | 31,103.4768 mg |
| 2 oz t | 62,206.9536 mg |
| 2.5 oz t | 77,758.692 mg |
| 5 oz t | 155,517.384 mg |
| 10 oz t | 311,034.768 mg |
| 15 oz t | 466,552.152 mg |
| 20 oz t | 622,069.536 mg |
| 25 oz t | 777,586.92 mg |
| 30 oz t | 933,104.304 mg |
| 50 oz t | 1,555,173.84 mg |
How to Convert Troy Ounces to Milligrams
To convert troy ounces to milligrams, multiply the weight by the following conversion ratio: 31,103.4768 milligrams/troy ounce.
Since one troy ounce is equal to 31,103.4768 milligrams, you can use this simple formula to convert:
The weight in milligrams is equal to the weight in troy ounces multiplied by 31,103.4768.
For example, here's how to convert 5 troy ounces to milligrams using the formula above.
How Many Milligrams Are in a Troy Ounce?
There are 31,103.4768 milligrams in a troy ounce, which is why we use this value in the formula above.
Our troy ounce to milligram calculator automatically converts your weight measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Troy Ounces and milligrams are both units used to measure weight. Keep reading to learn more about each unit.
What Is a Troy Ounce?
A troy ounce is a unit of weight equal to 0.0311035 kilograms (kg), the base unit for weight. Precious metal (gold, silver, platinum) mass standard equal to 480 grains or exactly 31.1034768 grams. [1]
The troy ounce is classified as a standard unit of weight. Troy Ounces can be abbreviated as oz t; for example, 1 troy ounce can be written as 1 oz t.
When working with troy ounces (oz t) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, troy ounces (oz t) are widely used across standard weight applications within international standard workflows, engineering documentation, and technical data sheets.
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). [2]
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.
When converting weight between troy ounces (oz t) and milligrams (mg), keep full floating-point precision (1 oz t = 31,103.4768 mg; 1 mg = 0.000032151 oz t) during intermediate calculations and round only the final milligram figure to match your instrument tolerance.
More Troy Ounce & Milligram Conversions
Need to calculate in the opposite direction? Use our milligrams to troy ounces calculator to switch your starting unit immediately. You can also explore related tools such as converting milligrams to troy ounces, converting micrograms to milligrams, or converting grams to milligrams.
Convert from Troy Ounces
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Frequently Asked Questions
References
- [1]NIST OWM StandardNIST OWM (SI Units — Mass)·Mass & Weight Metrology Standard — Troy Ounces (oz t) to Milligrams (mg)
- [2]NIST HB 44 SpecificationNIST HB 44 (NIST Handbook 44 (Current Ed.))·Unit Specifications: Troy Ounce (oz t) & Milligram (mg)
- [3]BIPM ReferenceBIPM (SI Base Unit: Kilogram (kg))·Conversion Factors & Mathematical Basis (oz t to mg)