Milligram is 0.001 gram units.
Milligrams to Grains Converter — mg to gr
Convert Milligram (mg) to Grain (gr) using the exact conversion factor (1 milligram = 0.0154323584 grain). See the formula, worked examples, and conversion table.
Milligrams to Grains converter
Converter
Mass/Weight Converter
Convert SI mass, imperial weight, jewelry, atomic, and astronomy mass units.
Context values
Some unit families need one extra value for a physically accurate result.
A grain is exactly 64.79891 milligrams.
Result = input x 1e-6 / 6.479891e-5.
Mass uses the kilogram as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Milligrams to Grains
Weight conversions between Milligram and Grain come up constantly in everyday commerce, shipping, and cooking, since US packaging is usually labeled in pounds while most of the rest of the world uses kilograms. Specifically: Milligram is 0.001 gram units, and a grain is exactly 64.79891 milligrams.
Formula
grains = milligrams × 0.0154323583529
This factor comes from each unit's defined relationship to the category's base unit: 1 milligram equals 0.000001 base units, and 1 grain equals 0.00006479891 base units, so dividing one by the other gives the direct milligram-to-grain factor of 0.0154323583529.
Simple example
1 mg × 0.01543235835 = 0.0154323584 gr
1 milligram = 0.0154323584 grains.
Real-world example
50 mg × 0.01543235835 = 0.7716179176 gr
50 milligrams = 0.7716179176 grains.
Conversion table
| Milligram (mg) | Grain (gr) |
|---|---|
| 1 mg | 0.0154323584 gr |
| 5 mg | 0.0771617918 gr |
| 10 mg | 0.1543235835 gr |
| 25 mg | 0.3858089588 gr |
| 50 mg | 0.7716179176 gr |
| 100 mg | 1.543235835 gr |
Reverse conversion: Grain to Milligram
0.0154323584 gr × 64.79891 = 1.000000003 mg
0.0154323584 grains = 1.000000003 milligrams.
milligrams = grains × 64.79891
For a page dedicated to this direction, see Grain to Milligram.
Understanding the Milligram (mg)
Milligram is 0.001 gram units.
Understanding the Grain (gr)
A grain is exactly 64.79891 milligrams.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many grains are in 1 milligram?
1 milligram equals 0.0154323584 grains, using the exact defined conversion factor rather than an estimate.
How do I convert milligram to grain?
Multiply the milligram value by 0.01543235835. The converter above does this instantly to whatever precision you set.
How do I convert grain back to milligram?
Use the reverse factor: 1 grain equals 64.79891 milligrams. You can also use the swap control in the converter above to flip the direction instantly.
What is a milligram?
Milligram (mg) is a unit of mass/weight.
What is a grain?
Grain (gr) is a unit of mass/weight.
Is the milligram to grain conversion exact?
Yes. Both milligram and grain are defined by fixed standards rather than physical artifacts, so the factor of 0.01543235835 used above is exact to as many digits as you choose to display.