A grain is exactly 64.79891 milligrams.
Grains to Nanograms Converter — gr to ng
Convert Grain (gr) to Nanogram (ng) using the exact conversion factor (1 grain = 64,798,910 nanogram). See the formula, worked examples, and conversion table.
Grains to Nanograms 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.
Nanogram is 1e-9 gram units.
Result = input x 6.479891e-5 / 1e-12.
Mass uses the kilogram as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Grains to Nanograms
Weight conversions between Grain and Nanogram 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 nanogram is 1e-9 gram units.
Formula
nanograms = grains × 64798910
This factor comes from each unit's defined relationship to the category's base unit: 1 grain equals 0.00006479891 base units, and 1 nanogram equals 1e-12 base units, so dividing one by the other gives the direct grain-to-nanogram factor of 64798910.
Simple example
1 gr × 64798910 = 64,798,910 ng
1 grain = 64,798,910 nanograms.
Real-world example
50 gr × 64798910 = 3,239,945,500 ng
50 grains = 3,239,945,500 nanograms.
Conversion table
| Grain (gr) | Nanogram (ng) |
|---|---|
| 1 gr | 64,798,910 ng |
| 5 gr | 323,994,550 ng |
| 10 gr | 647,989,100 ng |
| 25 gr | 1,619,972,750 ng |
| 50 gr | 3,239,945,500 ng |
| 100 gr | 6,479,891,000 ng |
Reverse conversion: Nanogram to Grain
1 ng × 1.543236e-8 = 1.543236e-8 gr
1 nanogram = 1.543236e-8 grains.
grains = nanograms × 1.543236e-8
For a page dedicated to this direction, see Nanogram to Grain.
Understanding the Grain (gr)
A grain is exactly 64.79891 milligrams.
Understanding the Nanogram (ng)
Nanogram is 1e-9 gram units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many nanograms are in 1 grain?
1 grain equals 64,798,910 nanograms, using the exact defined conversion factor rather than an estimate.
How do I convert grain to nanogram?
Multiply the grain value by 64798910. The converter above does this instantly to whatever precision you set.
How do I convert nanogram back to grain?
Use the reverse factor: 1 nanogram equals 1.543236e-8 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 nanogram?
Nanogram (ng) is a unit of mass/weight.
Is the grain to nanogram conversion exact?
Yes. Both grain and nanogram are defined by fixed standards rather than physical artifacts, so the factor of 64798910 used above is exact to as many digits as you choose to display.