A grain is exactly 64.79891 milligrams.
Grains to Megagrams Converter — gr to Mg
Convert Grain (gr) to Megagram (Mg) using the exact conversion factor (1 grain = 6.479891e-8 megagram). See the formula, worked examples, and conversion table.
Grains to Megagrams 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.
Megagram is 1000000 gram units.
Result = input x 6.479891e-5 / 1000.
Mass uses the kilogram as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Grains to Megagrams
Weight conversions between Grain and Megagram 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: A grain is exactly 64.79891 milligrams, and megagram is 1000000 gram units.
Formula
megagrams = grains × 6.479891e-8
This factor comes from each unit's defined relationship to the category's base unit: 1 grain equals 0.00006479891 base units, and 1 megagram equals 1000 base units, so dividing one by the other gives the direct grain-to-megagram factor of 6.479891e-8.
Simple example
1 gr × 6.479891e-8 = 6.479891e-8 Mg
1 grain = 6.479891e-8 megagrams.
Real-world example
50 gr × 6.479891e-8 = 0.0000032399 Mg
50 grains = 0.0000032399 megagrams.
Conversion table
| Grain (gr) | Megagram (Mg) |
|---|---|
| 1 gr | 6.479891e-8 Mg |
| 5 gr | 3.239945e-7 Mg |
| 10 gr | 6.479891e-7 Mg |
| 25 gr | 0.00000162 Mg |
| 50 gr | 0.0000032399 Mg |
| 100 gr | 0.0000064799 Mg |
Reverse conversion: Megagram to Grain
6.479891e-8 Mg × 15432358.35 = 1 gr
6.479891e-8 megagrams = 1 grain.
grains = megagrams × 15432358.3529
For a page dedicated to this direction, see Megagram to Grain.
Understanding the Grain (gr)
A grain is exactly 64.79891 milligrams.
Understanding the Megagram (Mg)
Megagram is 1000000 gram units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many megagrams are in 1 grain?
1 grain equals 6.479891e-8 megagrams, using the exact defined conversion factor rather than an estimate.
How do I convert grain to megagram?
Multiply the grain value by 6.479891e-8. The converter above does this instantly to whatever precision you set.
How do I convert megagram back to grain?
Use the reverse factor: 1 megagram equals 15,432,358.35 grains. You can also use the swap control in the converter above to flip the direction instantly.
What is a grain?
Grain (gr) is a unit of mass/weight.
What is a megagram?
Megagram (Mg) is a unit of mass/weight.
Is the grain to megagram conversion exact?
Yes. Both grain and megagram are defined by fixed standards rather than physical artifacts, so the factor of 6.479891e-8 used above is exact to as many digits as you choose to display.