A grain is exactly 64.79891 milligrams.
Grains to Drams Converter — gr to dr
Convert Grain (gr) to Dram (dr) using the exact conversion factor (1 grain = 0.0365714286 dram). See the formula, worked examples, and conversion table.
Grains to Drams 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.
An avoirdupois dram is 1/16 ounce.
Result = input x 6.479891e-5 / 0.001771845195.
Mass uses the kilogram as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Grains to Drams
Weight conversions between Grain and Dram 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 an avoirdupois dram is 1/16 ounce.
Formula
drams = grains × 0.0365714285714
This factor comes from each unit's defined relationship to the category's base unit: 1 grain equals 0.00006479891 base units, and 1 dram equals 0.00177184519531 base units, so dividing one by the other gives the direct grain-to-dram factor of 0.0365714285714.
Simple example
1 gr × 0.03657142857 = 0.0365714286 dr
1 grain = 0.0365714286 drams.
Real-world example
50 gr × 0.03657142857 = 1.828571429 dr
50 grains = 1.828571429 drams.
Conversion table
| Grain (gr) | Dram (dr) |
|---|---|
| 1 gr | 0.0365714286 dr |
| 5 gr | 0.1828571429 dr |
| 10 gr | 0.3657142857 dr |
| 25 gr | 0.9142857143 dr |
| 50 gr | 1.828571429 dr |
| 100 gr | 3.657142857 dr |
Reverse conversion: Dram to Grain
0.0365714286 dr × 27.34375 = 1.000000001 gr
0.0365714286 drams = 1.000000001 grains.
grains = drams × 27.34375
For a page dedicated to this direction, see Dram to Grain.
Understanding the Grain (gr)
A grain is exactly 64.79891 milligrams.
Understanding the Dram (dr)
An avoirdupois dram is 1/16 ounce.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many drams are in 1 grain?
1 grain equals 0.0365714286 drams, using the exact defined conversion factor rather than an estimate.
How do I convert grain to dram?
Multiply the grain value by 0.03657142857. The converter above does this instantly to whatever precision you set.
How do I convert dram back to grain?
Use the reverse factor: 1 dram equals 27.34375 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 dram?
Dram (dr) is a unit of mass/weight.
Is the grain to dram conversion exact?
Yes. Both grain and dram are defined by fixed standards rather than physical artifacts, so the factor of 0.03657142857 used above is exact to as many digits as you choose to display.