Quarter (UK) [qr (UK)]
The quarter (UK), abbreviated as qr (UK), is a traditional British unit of weight equal to 28 pounds (about 12.7 kilograms).
It is one-quarter of the UK (imperial) hundredweight, which is 112 pounds. The quarter was commonly used in the UK for weighing agricultural products and other bulk goods.
Summary:
1 UK quarter = 28 pounds (12.7 kg)
Equal to ¼ of the UK hundredweight (112 pounds)
Used historically in British trade and agriculture