Convert Grains to Long Hundredweights
Convert Grains (gr) to Long Hundredweights (long cwt) instantly and accurately.
Conversion Formula
long cwt = gr × 1.275510204e-6
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 Long Hundredweights
A long hundredweight (long cwt) equals 112 pounds or approximately 50.802 kg - equal to 8 stone. The standard hundredweight in the United Kingdom and much of its historical trading sphere, it reflects the medieval English stone of 14 lb (8 × 14 = 112). British agricultural commodity prices, wool trade records, and livestock market reports historically used long hundredweights. The UK meat trade still occasionally references hundredweights in wholesale pricing.
Quick Reference Table
| Grains (gr) | Long Hundredweights (long cwt) |
|---|---|
| 1 gr | 1.276 × 10-6 long cwt |
| 2 gr | 2.551 × 10-6 long cwt |
| 5 gr | 6.378 × 10-6 long cwt |
| 10 gr | 1.276 × 10-5 long cwt |
| 25 gr | 3.189 × 10-5 long cwt |
| 50 gr | 6.378 × 10-5 long cwt |
| 100 gr | 0.000127551 long cwt |