Milligram to Grain Converter
Convert Milligram (mg) to Grain (gr) instantly. 1 mg = 0.015432 gr.
Mass Converter
26 units available
1 mg = 0.015432 gr
Formula:
gr = mg × 0.0154323584With your value: 1 mg = 0.01543236 gr
How big is that?
Everyday references on a logarithmic scale, all expressed in milligram so you can sanity-check the result.
Other Milligram to Grain conversions
Milligram to Grain Conversion Table
| Milligram (mg) | Grain (gr) |
|---|---|
| 0.5 | 0.007716 |
| 1 | 0.015432 |
| 2 | 0.030865 |
| 5 | 0.077162 |
| 10 | 0.154324 |
| 15 | 0.231485 |
| 20 | 0.308647 |
| 25 | 0.385809 |
| 50 | 0.771618 |
| 100 | 1.543236 |
| 250 | 3.85809 |
| 500 | 7.716179 |
| 1000 | 15.432358 |
Grain to Milligram Conversion Table
| Grain (gr) | Milligram (mg) |
|---|---|
| 0.5 | 32.399455 |
| 1 | 64.79891 |
| 2 | 129.59782 |
| 5 | 323.99455 |
| 10 | 647.9891 |
| 15 | 971.98365 |
| 20 | 1,295.9782 |
| 25 | 1,619.97275 |
| 50 | 3,239.9455 |
| 100 | 6,479.891 |
| 250 | 16,199.7275 |
| 500 | 32,399.455 |
| 1000 | 64,798.91 |
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.
Milligram (mg)
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 Milligram to Grain
To convert from Milligram (mg) to Grain (gr), multiply the value by 0.0154323584.
Formula: gr = mg × 0.0154323584
Reverse: mg = gr × 64.79891
Step-by-Step Example
- Start with your value in Milligram. For example: 5 mg
- Multiply by the conversion factor: 5 x 0.0154323584
- The result is: 0.077162 gr
About Milligram
The milligram equals one thousandth of a gram and is the standard unit for drug dosage and nutrient quantities.
Common uses: medication dosage, nutrition labels, laboratory work.
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 Milligram?
There are exactly 0.0154323584 Grain in 1 Milligram. This means the conversion factor from Milligram to Grain is 0.0154323584.
What is the formula to convert Milligram to Grain?
The formula to convert Milligram to Grain is: gr = mg × 0.0154323584. For example, to convert 10 Milligram to Grain, you would multiply 10 by 0.0154323584.
What is a Milligram?
The milligram equals one thousandth of a gram and is the standard unit for drug dosage and nutrient quantities.
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 Milligram?
The Milligram is commonly used in medication dosage, nutrition labels, laboratory work.
Related Mass Conversions
Cite this page
UnitConvertLab. (2026). Milligram to Grain converter. UnitConvertLab. Retrieved from https://unitconvertlab.com/convert/milligram-to-grain