Convert Grains to Troy Pounds
Convert Grains (gr) to Troy Pounds (lb t) instantly and accurately.
Conversion Formula
lb t = gr × 0.0001736111111
About Grains
A grain (gr) is the smallest unit in both the avoirdupois and troy weight systems, equal to exactly 64.79891 milligrams. Originally defined as the mass of a single grain of barley or wheat from the middle of an ear, it has been a standard of weight since ancient times. Today, grains are used to weigh gunpowder charges and bullets (a standard .308 rifle bullet weighs 168 gr), pharmaceutical preparations in apothecary compounding, and the fineness of gold alloys. Arrowhead and fishing hook weights are also specified in grains.
About Troy Pounds
A troy pound (lb t) equals 12 troy ounces or 5,760 grains - approximately 373.24 grams. It is lighter than the common avoirdupois pound (453.59 g) because the troy system divides the pound into 12 ounces rather than 16. Historically used across Europe for trade in precious metals and pharmaceuticals, the troy pound was the legal standard in England from the 15th century until 1878. In the United States, the troy pound was once the official standard for coinage but was abolished for commercial use in 1828.
Quick Reference Table
| Grains (gr) | Troy Pounds (lb t) |
|---|---|
| 1 gr | 0.000173611 lb t |
| 2 gr | 0.000347222 lb t |
| 5 gr | 0.000868056 lb t |
| 10 gr | 0.00173611 lb t |
| 25 gr | 0.00434028 lb t |
| 50 gr | 0.00868056 lb t |
| 100 gr | 0.0173611 lb t |