Milligrams to Micrograms Converter
Enter the weight in milligrams below to convert it to micrograms.
Convert Milligrams to Micrograms
Enter a value in milligrams (mg) to convert to micrograms (µg).
Milligram to Microgram Conversion Table
Table showing various milligram measurements converted to micrograms. Click any preset value or arrow to load it into the converter.
How to Convert Milligrams to Micrograms
To convert milligrams to micrograms, multiply the weight by the following conversion ratio: 1,000 micrograms/milligram.
Since one milligram is equal to 1,000 micrograms, you can use this simple formula to convert:
The weight in micrograms is equal to the weight in milligrams multiplied by 1,000.
For example, here's how to convert 5 milligrams to micrograms using the formula above.
How Many Micrograms Are in a Milligram?
There are 1,000 micrograms in a milligram, which is why we use this value in the formula above.
Our milligram to microgram calculator automatically converts your weight measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Milligrams and micrograms 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 a Microgram?
A microgram is a unit of weight equal to 1/1,000,000,000 of a kilogram (1e-9 kg). One-millionth of a gram (10⁻⁹ kg). [2]
The microgram is classified as a metric and SI-compatible unit of weight. Micrograms can be abbreviated as µg; for example, 1 microgram can be written as 1 µg.
In the metric system, "micro" is the standard SI prefix for millionths, or 10⁻⁶. This makes the microgram (µg) a convenient decimal multiple of the gram (g).
In practice, micrograms (µg) 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 milligrams (mg) and micrograms (µg), keep full floating-point precision (1 mg = 1,000 µg; 1 µg = 0.001 mg) during intermediate calculations and round only the final microgram figure to match your instrument tolerance.
More Milligram & Microgram Conversions
Need to calculate in the opposite direction? Use our micrograms to milligrams converter (µg to mg) to switch your starting unit immediately. You can also explore related tools such as converting milligrams to grams, converting kilograms to pounds, or converting pounds to kilograms.
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 Micrograms (µg)
- [2]NIST HB 44 SpecificationNIST HB 44 (NIST Handbook 44 (Current Ed.))·Unit Specifications: Milligram (mg) & Microgram (µg)
- [3]BIPM ReferenceBIPM (SI Base Unit: Kilogram (kg))·Conversion Factors & Mathematical Basis (mg to µg)