A grain is exactly 64.79891 milligrams.
Grains to Long tons Converter — gr to long ton
Convert Grain (gr) to Long ton (long ton) using the exact conversion factor (1 grain = 6.377551e-8 long ton). See the formula, worked examples, and conversion table.
Grains to Long tons 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 British long ton is 2,240 pounds.
Result = input x 6.479891e-5 / 1016.046909.
Mass uses the kilogram as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Grains to Long tons
Weight conversions between Grain and Long ton 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 a British long ton is 2,240 pounds.
Formula
long tons = grains × 6.377551e-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 long ton equals 1016.0469088 base units, so dividing one by the other gives the direct grain-to-long ton factor of 6.377551e-8.
Simple example
1 gr × 6.377551e-8 = 6.377551e-8 long ton
1 grain = 6.377551e-8 long tons.
Real-world example
50 gr × 6.377551e-8 = 0.0000031888 long ton
50 grains = 0.0000031888 long tons.
Conversion table
| Grain (gr) | Long ton (long ton) |
|---|---|
| 1 gr | 6.377551e-8 long ton |
| 5 gr | 3.188776e-7 long ton |
| 10 gr | 6.377551e-7 long ton |
| 25 gr | 0.0000015944 long ton |
| 50 gr | 0.0000031888 long ton |
| 100 gr | 0.0000063776 long ton |
Reverse conversion: Long ton to Grain
6.377551e-8 long ton × 15680000 = 0.9999999968 gr
6.377551e-8 long tons = 0.9999999968 grains.
grains = long tons × 15680000
For a page dedicated to this direction, see Long ton to Grain.
Understanding the Grain (gr)
A grain is exactly 64.79891 milligrams.
Understanding the Long ton (long ton)
A British long ton is 2,240 pounds.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many long tons are in 1 grain?
1 grain equals 6.377551e-8 long tons, using the exact defined conversion factor rather than an estimate.
How do I convert grain to long ton?
Multiply the grain value by 6.377551e-8. The converter above does this instantly to whatever precision you set.
How do I convert long ton back to grain?
Use the reverse factor: 1 long ton equals 15,680,000 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 long ton?
Long ton (long ton) is a unit of mass/weight.
Is the grain to long ton conversion exact?
Yes. Both grain and long ton are defined by fixed standards rather than physical artifacts, so the factor of 6.377551e-8 used above is exact to as many digits as you choose to display.