Quarters (UK) to Kilograms (qr to kg)

1 quarter (UK) equals 12.70058636 kilograms exactly.

1 quarter (UK) = 12.70058636 kilograms

How to convert quarters (UK) to kilograms

To convert quarters (UK) to kilograms, multiply the number of quarters (UK) by 12.70058636. This factor is exact. To go the other way, multiply kilograms by 0.07873652221 (rounded).

kilograms = quarters (UK) × 12.70058636

Example: 10 quarters (UK) = 127.0058636 kilograms.

About these units

Quarter (UK) (qr)

Imperial (British)Historical unit (no longer in standard use)

28 pounds (12.7 kg), a quarter of a long hundredweight. A traditional British unit of weight.

Taking one fourth of a larger unit, as the name suggests, produced several quarters in British measure. The mass version is 28 pounds, a quarter of the 112 pound long hundredweight and two stone, which is roughly 12.7 kilograms. The Units of Measurement Regulations 1994 define it as 28 pounds.

A second quarter measured dry goods. Under the Weights and Measures Act 1824 a quarter of grain was eight bushels, or 64 imperial gallons, about 290.95 liters, a size known as the quarter of London since the Latin quarterium Londoniense of Magna Carta. The 1985 Act dropped it as a volume unit. The weight quarter lingers on old anvils and bells stamped in hundredweight, quarters and pounds: an anvil marked 1.1.8, for example, weighs 148 pounds. Four of them make a hundredweight, and eighty make a long ton.

1 quarter (UK) = 12.70058636 kilograms (exactly).

Sources: Wikipedia: Quarter (unit); Wikipedia: Hundredweight

Kilogram (kg)

Metric (SI)Current unit

The SI base unit of mass. Since 2019 it is defined by fixing the value of the Planck constant, replacing the old platinum-iridium cylinder in Paris.

Oddly for a base unit, the kilogram began life as a derived one. In 1793 revolutionary France defined the grave as the mass of one litre of water, and a decree of 1795 then replaced it with the kilogramme, a name built from the Greek khilioi (a thousand) and gramma, a Late Latin word for a small weight. In 1799 a platinum cylinder, the Kilogramme des Archives, became the physical standard, matching a cubic decimetre of water at its densest, around 4 degrees Celsius. In 1889 the metric community adopted a platinum-iridium cylinder made in 1879, the International Prototype of the Kilogram, nicknamed Le Grand K.

The kilogram is still the only SI base unit with a prefix in its name. Because SI forbids stacked prefixes, a millionth of a kilogram is a milligram rather than a microkilogram, so every mass prefix is attached to the gram. Calibrating every national standard against one object in a vault near Paris meant that all of them drifted relative to it, so in November 2018 member states voted to tie the kilogram to a fixed value of the Planck constant. The change took effect on 20 May 2019. Day to day nothing shifted, but the definition no longer depends on a single piece of metal.

The kilogram is the reference unit for weight & mass on this site.

Sources: NIST: Kilogram introduction (SI redefinition); Wikipedia: Kilogram

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