Grain to Microgram Converter
Convert Grain (gr) to Microgram (µg) instantly. 1 gr = 64,798.91 µg.
Mass Converter
26 units available
1 gr = 64,798.91 µg
Formula:
µg = gr × 64,798.91With your value: 1 gr = 64,798.91 µg
How big is that?
Everyday references on a logarithmic scale, all expressed in grain so you can sanity-check the result.
Other Grain to Microgram conversions
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 |
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 |
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.
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
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
How to Convert Grain to Microgram
To convert from Grain (gr) to Microgram (µg), multiply the value by 64,798.91.
Formula: µg = gr × 64,798.91
Reverse: gr = µg × 0.0000154324
Step-by-Step Example
- Start with your value in Grain. For example: 5 gr
- Multiply by the conversion factor: 5 x 64,798.91
- The result is: 323,994.55 µg
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).
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.
Frequently Asked Questions
How many Microgram are in 1 Grain?
There are exactly 64,798.91 Microgram in 1 Grain. This means the conversion factor from Grain to Microgram is 64,798.91.
What is the formula to convert Grain to Microgram?
The formula to convert Grain to Microgram is: µg = gr × 64,798.91. For example, to convert 10 Grain to Microgram, you would multiply 10 by 64,798.91.
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 is a Microgram?
The microgram (µg) equals one millionth of a gram. Vitamins, hormones and trace contaminants are dosed at this scale.
What are the common uses of Grain?
The Grain is commonly used in ammunition, archery, pharmacy (historic).
Related Mass Conversions
Cite this page
UnitConvertLab. (2026). Grain to Microgram converter. UnitConvertLab. Retrieved from https://unitconvertlab.com/convert/grain-to-microgram