Microgram to Grain Converter
Convert Microgram (µg) to Grain (gr) instantly. 1 µg = 1.543236e-5 gr.
Mass Converter
26 units available
1 µg = 1.543236e-5 gr
Formula:
gr = µg × 0.0000154324With your value: 1 µg = 1.543236e-5 gr
How big is that?
Everyday references on a logarithmic scale, all expressed in microgram so you can sanity-check the result.
Other Microgram to Grain conversions
Microgram to Grain Conversion Table
| Microgram (µg) | Grain (gr) |
|---|---|
| 0.5 | 7.716179e-6 |
| 1 | 1.543236e-5 |
| 2 | 3.086472e-5 |
| 5 | 7.716179e-5 |
| 10 | 0.000154 |
| 15 | 0.000231 |
| 20 | 0.000309 |
| 25 | 0.000386 |
| 50 | 0.000772 |
| 100 | 0.001543 |
| 250 | 0.003858 |
| 500 | 0.007716 |
| 1000 | 0.015432 |
Grain to Microgram Conversion Table
| Grain (gr) | Microgram (µg) |
|---|---|
| 0.5 | 32,399.455 |
| 1 | 64,798.91 |
| 2 | 129,597.82 |
| 5 | 323,994.55 |
| 10 | 647,989.1 |
| 15 | 971,983.65 |
| 20 | 1,295,978.2 |
| 25 | 1,619,972.75 |
| 50 | 3,239,945.5 |
| 100 | 6,479,891 |
| 250 | 16,199,727.5 |
| 500 | 32,399,455 |
| 1000 | 64,798,910 |
Where these values come from
Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.
Microgram (µg)
Mass
Traceable to the kilogram, defined by fixing the Planck constant at 6.626 070 15 × 10⁻³⁴ J·s. Avoirdupois masses derive from the 1959 international pound (0.453 592 37 kg exactly).
Source: BIPM, The International System of Units (SI), 9th edition, 2019 (updated 2024)
Bureau International des Poids et Mesures · Reviewed 2026-07-01
Grain (gr)
Mass
Traceable to the kilogram, defined by fixing the Planck constant at 6.626 070 15 × 10⁻³⁴ J·s. Avoirdupois masses derive from the 1959 international pound (0.453 592 37 kg exactly).
Source: BIPM, The International System of Units (SI), 9th edition, 2019 (updated 2024)
Bureau International des Poids et Mesures · Reviewed 2026-07-01
How to Convert Microgram to Grain
To convert from Microgram (µg) to Grain (gr), multiply the value by 1.543236e-5.
Formula: gr = µg × 0.0000154324
Reverse: µg = gr × 64,798.91
Step-by-Step Example
- Start with your value in Microgram. For example: 5 µg
- Multiply by the conversion factor: 5 x 1.543236e-5
- The result is: 7.716179e-5 gr
About Microgram
The microgram (µg) equals one millionth of a gram. Vitamins, hormones and trace contaminants are dosed at this scale.
Fun Fact: Clinical writing spells out "microgram" rather than using µg to avoid dosing errors.
Common uses: pharmacology, vitamin dosing, toxicology.
About Grain
The grain equals exactly 64.79891 milligrams and was originally the weight of a single barleycorn. It is still the standard unit for bullets, propellant and arrows.
Common uses: ammunition, archery, pharmacy (historic).
Frequently Asked Questions
How many Grain are in 1 Microgram?
There are exactly 1.543236e-5 Grain in 1 Microgram. This means the conversion factor from Microgram to Grain is 1.543236e-5.
What is the formula to convert Microgram to Grain?
The formula to convert Microgram to Grain is: gr = µg × 0.0000154324. For example, to convert 10 Microgram to Grain, you would multiply 10 by 1.543236e-5.
What is a Microgram?
The microgram (µg) equals one millionth of a gram. Vitamins, hormones and trace contaminants are dosed at this scale.
What is a Grain?
The grain equals exactly 64.79891 milligrams and was originally the weight of a single barleycorn. It is still the standard unit for bullets, propellant and arrows.
What are the common uses of Microgram?
The Microgram is commonly used in pharmacology, vitamin dosing, toxicology.
Related Mass Conversions
Cite this page
UnitConvertLab. (2026). Microgram to Grain converter. UnitConvertLab. Retrieved from https://unitconvertlab.com/convert/microgram-to-grain