Convert Grains to Quarters
Convert Grains (gr) to Quarters (qr) instantly and accurately.
Conversion Formula
qr = gr × 5.102040816e-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 Quarters
A quarter (qr) in the avoirdupois system equals 28 pounds or one quarter of a hundredweight - approximately 12.70 kg. Historically, quarters were used in British trade for measuring grain, wool, and other bulk commodities. The British quarter of grain (28 lb) was the standard purchase quantity at markets and mills throughout medieval and early modern England. In the US, the term 'quarter' sometimes refers to a quarter of a short hundredweight (25 lb) rather than the British 28 lb.
Quick Reference Table
| Grains (gr) | Quarters (qr) |
|---|---|
| 1 gr | 5.102 × 10-6 qr |
| 2 gr | 1.02 × 10-5 qr |
| 5 gr | 2.551 × 10-5 qr |
| 10 gr | 5.102 × 10-5 qr |
| 25 gr | 0.000127551 qr |
| 50 gr | 0.000255102 qr |
| 100 gr | 0.000510204 qr |