The imperial system of weights, or all the more effectively the avoirdupois arrangement of weights is the standard arrangement of weight in the United States is still in like manner use in the United Kingdom. The framework depends on a pound (lb) of 16 ounces (oz). These days the avoirdupois pound is characterized as far as the kilogram as being precisely 0.45359237 kilograms. Beforehand standard pound weights were held by the British treasury.

Since the autonomy of the United States there have been slight changes to the avoirdupois weight framework in the UK thus the US framework turned into the American Customary System, however the essential units, for example, the pound and the ounce are still the same in the American Customary System as in the British Imperial System.

English Imperial Weights

Prior to the season of Elizabeth the main, the avoirdupois arrangement of weights was being developed and numerous adjustments in units and their qualities were made. The last real change in the framework came in Elizabethan times, this incorporated the expansion of the troy grain and the meaning of the pound as 7,000 grains.

Table of Units

Unit
Abbreviation
As Pounds
As Kilos
Notes

grain
gr
1/7000
0.0000648kg
As troy grain - introduced by Elizabeth I

dram
dr
1/256
0.001772kg
Defined as 1/16th of an ounce previously
known as the "part"

ounce
oz
1/16
0.0283kg
Commonly used in US and UK recipes

pound
lb
1
0.45359237kg
Base unit of avoirdupois system

stone
st
14
6.35kg Not used in the US customary system

quarter
qtr
28
12.70kg
Equivalent of 2 stone or a quarter of a hundredweight

Hundred weight
cwt
112
50.80kg
Defined as 8 stone in the British Imperial system

ton
t
2240
1016kg
Known as the long ton to differentiate from the US short ton

US Customary Units

The US standard arrangement of weights depends on the British framework at the season of freedom, numerous units continue as before between the two frameworks however there are contrasts. The distinctions incorporate the stone not being incorporated into the US framework as it was just once incorporated into the British framework in 1824. Likewise the hundredweight in the US standard framework is characterized as 100 lb and the ton and quarter are additionally taking into account a hundredweight of 100 lb, though the in the British framework the hundredweight is likeness 8 stone (112 lb). There stays some disarray in the matter of whether the 100 lb hundredweight was ever being used in the UK before the presentation of the stone.

Table of Units

Unit
Abbreviation
As Pounds
As Kilos
Notes

grain
gr
1/7000
0.0000648kg
As troy grain

dram
dr
1/256
0.001772kg
Defined as 1/16th of an ounce

ounce
oz
1/16
0.0283kg
Common between the US and UK systems

pound
lb
1
0.45359237kg
Base unit of avoirdupois system

quarter
qtr
25
11.34kg
Equivalent of a quarter of a hundredweight

hundred weight
cwt
100
45.36kg
Differs from the British hundredweight by 12 lbs

ton
t
2000
907.2kg
Known as the short ton to differentiate from the long ton