Convert Grains to Stones
Convert Grains (gr) to Stones (st) instantly and accurately.
Conversion Formula
st = gr × 1.020408163e-5
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 Stones
A stone (st) equals 14 pounds or approximately 6.350 kg. It is the standard unit for expressing human body weight in the United Kingdom and Ireland, where a person will say they weigh '11 stone 4' (meaning 11 stone and 4 pounds, or 158 lb / 71.7 kg). Despite the UK's official adoption of the metric system, stones remain the dominant unit for personal body weight on British bathroom scales, in doctors' offices, and in everyday conversation. British newspapers and sports reports routinely describe athletes' weights in stones and pounds.
Quick Reference Table
| Grains (gr) | Stones (st) |
|---|---|
| 1 gr | 1.02 × 10-5 st |
| 2 gr | 2.041 × 10-5 st |
| 5 gr | 5.102 × 10-5 st |
| 10 gr | 0.000102041 st |
| 25 gr | 0.000255102 st |
| 50 gr | 0.000510204 st |
| 100 gr | 0.00102041 st |