English units were theunits of measurement used inEngland up to 1826 (when they were replaced byImperial units), which evolved as a combination of theAnglo-Saxon andRoman systems of units. Various standards have applied to English units at different times, in different places, and for different applications.

Use of the term "English units" can be ambiguous, as, in addition to the meaning used in this article, it is sometimes used to refer to the units of the descendant Imperial system as well to those of the descendant system ofUnited States customary units.^[1]

The two main sets of English units were theWinchester Units, used from 1495 to 1587, as affirmed byKing Henry VII, and theExchequer Standards, in use from 1588 to 1825, as defined byQueen Elizabeth I.^[2][3]

In England (and the British Empire), English units were replaced by Imperial units in 1824 (effective as of 1 January 1826) by aWeights and Measures Act, which retained many though not all of the unit names and redefined (standardised) many of the definitions. In the US, being independent from the British Empire decades before the 1824 reforms, English units were standardized and adopted (as "US Customary Units") in 1832.^[4]

Very little is known of theunits of measurement used in the British Isles prior to Roman colonisation in the 1st century AD. During the Roman period, Roman Britain relied onAncient Roman units of measurement. During theAnglo-Saxon period, the North German foot of 13.2 inches (340 millimetres) was the nominal basis for other units of linear measurement. The foot was divided into 4 palms or 12 thumbs. A cubit was 2 feet, an elne 4 feet. The rod was 15 Anglo-Saxon feet, the furlong 10 rods. An acre was 4 rods × 40 rods, i.e. 160 square rods or 36,000 square Anglo-Saxon feet. However, Roman units continued to be used in the construction crafts, and reckoning by theRoman mile of 5,000 feet (or 8stades) continued, in contrast to other Germanic countries which adopted the name "mile" for a longer native length closer to theleague (which was 3 Roman miles). From the time ofOffa King of Mercia (8th century) until 1526 theSaxon pound, also known as themoneyers' pound (and later known as theTower pound) was the fundamental unit of weight (by Offa's law, one pound of silver, by weight, was subdivided into 240 silver pennies, hence (in money) 240 pence – twenty shillings – was known asone pound).

Prior to the enactment of a law known as the "Composition of Yards and Perches" (Latin:Compositio ulnarum et perticarum)^[5] some time between 1266 and 1303, the English system of measurement had been based on that of theAnglo-Saxons, who were descended from tribes of northernGermany. TheCompositio redefined the yard, foot, inch, and barleycorn to10⁄11 of their previous value.^{[dubious –discuss]} However, it retained the Anglo-Saxon rod of 15 x11⁄10 feet (5.03 metres) and the acre of 4 × 40 square rods. Thus, the rod went from 5 old yards to5+1⁄2 new yards, or 15 old feet to16+1⁄2 new feet. The furlong went from 600 old feet (200 old yards) to 660 new feet (220 new yards). The acre went from 36,000 old square feet to 43,560 new square feet. Scholars have speculated that theCompositio may have represented a compromise between the two earlier systems of units, the Anglo-Saxon and the Roman.

TheNorman conquest of England introduced just one new unit: the bushel.^{[citation needed]}William the Conqueror, in one of his first legislative acts, confirmed existing Anglo-Saxon measurement, a position which was consistent with Norman policy in dealing with occupied peoples. TheMagna Carta of 1215 stipulates that there should be a standard measure of volume for wine, ale and corn (the London Quarter), and for weight, but does not define these units.^[6]

Later development of the English system was by defining the units in laws and by issuing measurement standards. Standards were renewed in 1496, 1588, and 1758.^[7] The lastImperial Standard Yard in bronze was made in 1845; it served as the standard in theUnited Kingdom until the yard was redefined by theinternational yard and pound agreement (as 0.9144 metres) in 1959 (statutory implementation was in theWeights and Measures Act 1963). Over time, the English system had spread to other parts of theBritish Empire.

Selected excerpts from the bibliography ofMarks and Marking of Weights and Measures of the British Isles^[8]

• 1215 Magna Carta — the earliest statutory declaration for uniformity of weights and measures
• 1335 8 & 9 Edw. 3. c. 1^{[clarification needed]} — First statutory reference describing goods as avoirdupois
• 14142 Hen. 5. Stat. 2. c. 4 — First statutory mention of the Troy pound
• 149512 Hen. 7. c. 5 — New Exchequer standards were constructed, including Winchester capacity measures defined by Troy weight of their content of threshed wheat by stricken (i.e. level) measure (first statutory mention of Troy weight as standard weight for bullion, bread, spices etc.).^[9]
• 1527 Hen VIII — Abolished the Tower pound
• 153123 Hen. 8. c. 4 — Barrel to contain 36 gallons of beer or 32 of ale; kilderkin is half of this; firkin is half again.^[10]
• 153224 Hen. 8. c. 3 — First statutory references to use of avoirdupois weight.^[11]
• 153628 Hen. 8. c. 4 — Added the tierce (41 gallons)
• 1588 (Elizabeth I) — A new series of Avoirdupois standard bronze weights (bell-shaped from 56 lb to 2 lb and flat-pile from 8 lb to a dram), with new Troy standard weights in nested cups, from 256 oz to1⁄8 oz in a binary progression.
• 1601–1602 — Standard bushels and gallons were constructed based on the standards of Henry VII and a new series of capacity measures were issued.
• 166012 Cha. 2. c. 24 — Barrel of beer to be 36 gallons, taken by the gauge of the Exchequer standard of the ale quart; barrel of ale to be 32 gallons; all other liquors retailed to be sold by the wine gallon
• 16891 Will. & Mar. c. 24 — Barrels of beer and ale outside London to contain 34 gallons
• 1695 7 Will. 3. c. 24 (I) — Irish Act about grain measures decreed: unit of measure to be Henry VIII's gallon as confirmed by Elizabeth I; i.e.272+1⁄4 cubic inches; standard measures of the barrel (32 gallons), half-barrel (16 gallons), bushel (8), peck (2), and gallon lodged in the Irish Exchequer; and copies were provided in every county, city, town, etc.
• 16968 & 9 Will. 3. c. 22 — Size of Winchester bushel "every round bushel with a plain and even bottom being18+1⁄2″ wide throughout and 8″ deep" (i.e. a dry measure of 2150 in³ per gallon).
• 17066 Ann. c. 11 —Act of Union decreed the weights and measures of England to be applied in Scotland, whose burgs (towns) were to take charge of the duplicates of the English Standards sent to them.
• 17066 Ann. c. 27 — Wine gallon to be a cylindrical vessel with an even bottom 7″ diameter throughout and 6″ deep from top to bottom of the inside, or holding 231 in³ and no more.
• 171312 Ann. c. 17 — The legal coal bushel to be round with a plain and even bottom,19+1⁄2 inches from outside to outside and to hold 1 Winchester bushel and 1 quart of water.
• 17185 Geo. 1. c. 18 — Decreed Scots Pint to be exactly 103 in³.
• 180343 Geo. 3. c. 151 — Referred to wine bottles making about 5 to the wine gallon (i.e. Reputed Quarts)
• 18245 Geo. 4. c. 74 —Weights and Measures Act 1824 completely reorganized British metrology and established Imperial weights and measures; defined the yard, troy and avoirdupois pounds and the gallon (as the standard measure for liquids and dry goods not measured by heaped measure), and provided for a 'brass' standard gallon to be constructed.
• 18256 Geo. 4. c. 12 — Delayed introduction of Imperial weights and measures from 1 May 1825 to 1 January 1826.
• 18355 & 6 Will. 4. c. 63 —Weights and Measures Act 1835 abolished local and customary measures, including the Winchester bushel; made heaped measure illegal; required trade to be carried out by avoirdupois weight only, except for bullion, gems and drugs (which were to be sold by troy weight instead); decreed that all forms of coal were to be sold by weight and not measure; legalised the 'stone' as 14 lb (6.4 kg), the 'hundredweight' as 112 lb (51 kg), and the (long) ton as 20 hundredweight, or 2,240 lb (1,020 kg).
• 185316 & 17 Vict. c. 29 — Permitted the use of decimal bullion weights.
• 186629 & 30 Vict. c. 82 —Standards of Weights, Measures, and Coinage Act 1866 transferred all duties and standards from the Exchequer to the newly created Standards Department of the Board of Trade.
• 187841 & 42 Vict. c. 49 —Weights and Measures Act 1878 defined the Imperial standard yard and pound; enumerated the secondary standards of measure and weight derived from the Imperial standards; required all trade by weight or measure to be in terms of one of the Imperial weights or measures or some multiple part thereof; abolished the Troy pound.
• 1963 c. 31 —Weights and Measures Act 1963 abolished the chaldron of coal, the fluid drachm and minim (effective 1 February 1971), discontinued the use of the quarter, abolished the use of the bushel and peck, and abolished the pennyweight (from 31 January 1969).

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four to eightbovates. A unit of yield, rather than area, it measured the amount of land able to support a singlehousehold for agricultural and taxation purposes.

Knight's fee

five hides. Aknight's fee was expected to produce one fully equipped soldier for aknight's retinue in times of war.

Hundred orwapentake

100hides grouped for administrative purposes.

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Many measures ofcapacity were understood as fractions or multiples of agallon. For example, a quart is a quarter of a gallon, and a pint is half of a quart, or an eighth of a gallon. These ratios applied regardless of the specific size of the gallon. Not only did the definition of the gallon change over time, but there were several different kinds of gallon, which existed at the same time. For example, awine gallon with a volume of 231 cubic inches (the basis of theU.S. gallon) and anale gallon of 282 cubic inches, were commonly used for many decades prior to the establishment of theimperial gallon. In other words, a pint of ale and a pint of wine were not the same size. On the other hand, some measures – such as thefluid ounce – were not defined as a fraction of a gallon. For that reason, it is not always possible to give accurate definitions of units such as pints or quarts, in terms of ounces, prior to the establishment of the imperial gallon.

Liquid measures as binary submultiples of their respective gallons (ale or wine):

Wine is traditionally measured based on thewine gallon and its related units. Other liquids such as brandy, spirits, mead, cider, vinegar, oil, honey, and so on, were also measured and sold in these units.^[17]

The wine gallon was re-established byQueen Anne in 1707 after a 1688 survey found theExchequer no longer possessed the necessary standard but had instead been depending on a copy held by theGuildhall.^{[citation needed]} Defined as 231cubic inches, it differs from the laterimperial gallon, but is equal to theUnited States customary gallon.

Rundlet

18 wine gallons or1⁄7 wine pipe

Wine barrel

31.5 wine gallons or1⁄2 wine hogshead

Tierce

42 wine gallons,1⁄2 puncheon or1⁄3 wine pipe

Wine hogshead

2 wine barrels, 63 wine gallons^[18] or1⁄4 wine tun

Puncheon or tertian

2 tierce, 84 wine gallons or1⁄3 wine tun

Wine pipe or butt

2 wine hogshead, 3 tierce, 7 roundlet or 126 wine gallons

Wine tun

2 wine pipe, 3 puncheon or 252 wine gallons

Pin

4.5 gallons or1⁄8 beer barrel

Firkin

2 pins, 9 gallons (ale, beer or goods) or1⁄4 beer barrel

Kilderkin

2 firkins, 18 gallons or1⁄2 beer barrel

Beer barrel

2 kilderkins, 36 gallons or2⁄3 beer hogshead

Beer hogshead

3 kilderkins, 54 gallons or 1.5 beer barrels

Beer pipe or butt

2 beer hogsheads, 3 beer barrels or 108 gallons

Beer tun

2 beer pipes or 216 gallons

TheWinchester measure, also known as the corn measure, centered on thebushel of approximately 2,150.42 cubic inches, which had been in use with only minor modifications since at least the late 15th century. The wordcorn at that time referred to all types of grain. The corn measure was used to measure and sell many types of dry goods, such as grain, salt, ore, and oysters.^[21]

However, in practice, such goods were often sold by weight. For example, it might be agreed by local custom that a bushel of wheat should weigh 60 pounds, or a bushel of oats should weigh 33 pounds. The goods would be measured out by volume, and then weighed, and the buyer would pay more or less depending on the actual weight. This practice of specifyingbushels in weight for each commodity continues today. This was not always the case though, and even the same market that sold wheat and oats by weight might sell barley simply by volume. In fact, the entire system was not well standardized. A sixteenth of a bushel might be called apottle,hoop,beatment, orquartern, in towns only a short distance apart. In some places potatoes might be sold by the firkin—usually a liquid measure—with one town defining a firkin as 3 bushels, and the next town as 2 1/2 bushels.^[22]

The pint was the smallest unit in the corn measure. The corn gallon, one eighth of a bushel, was approximately 268.8 cubic inches. Most of the units associated with the corn measure were binary (sub)multiples of the bushel:^[17][21]

Other units included thewey (6 or sometimes 5 seams or quarters), and thelast (10 seams or quarters).^[17][21]

Perch

24.75 cubic feet of dry stone, derived from the more commonly known perch, a unit of length equal to 16.5 feet.^[23]

Cord

128 cubic feet of firewood, a stack of firewood 4 ft × 4 ft × 8 ft^[24]

Fluid-grain

The volume of 1grain of distilled water at 62 °F, 30inHg pressure.^[25]

At that reference, water has a density of ≃ 0.9988g⁄ml (438.0⁠grain/imp fl oz⁠ or 1.001⁠oz_av/imp fl oz⁠), and thus:

= 1.096imperial minim^[26] = .06488 ml or approximately adrop.

TheAvoirdupois,Troy andApothecary systems of weights all shared the same finest unit, thegrain; however, they differ as to the number of grains there are in a dram, ounce andpound. This grain was legally defined as the weight of a grain seed from the middle of an ear ofbarley. There also was a smallerwheat grain, said to be3⁄4 (barley) grains or about 48.6 milligrams.

The avoirdupois pound was eventually standardised as 7,000 grains and was used for all products not subject to Apothecaries's or Tower weight.^[27]

The Troy and Tower pounds and their subdivisions were used for coins and precious metals. The Tower pound, which was based upon an earlier Anglo-Saxon pound, was replaced by the Troy pound when a proclamation dated 1526 required the Troy pound to be used for mint purposes instead of the Tower pound.^[28] No standards of the Tower pound are known to have survived.^[29]

Established in the 8th century byOffa of Mercia, apound sterling (or "pound of sterlings"^[30]) was that weight ofsterling silver sufficient to make 240silver pennies.^[31]

Grain (gr)

= 64.79891 mg

Pennyweight (dwt)

24 gr ≈ 1.56 g

Ounce (oz t)

20 dwt = 480 gr ≈ 31.1 g

Pound (lb t)

12 oz t = 5760 gr ≈ 373 g

Mark

8 oz t

Grain (gr)

=45⁄64 gr t ≈ 45.6 mg

Pennyweight (dwt)

32 gr T =22+1⁄2 gr t ≈ 1.46 g

Tower ounce

20 dwt T = 640 gr T =18+3⁄4 dwt t = 450 gr t ≈ 29.2 g

Tower pound

12 oz T = 240 dwt T = 7680 gr T = 225 dwt t = 5400 gr t ≈ 350 g

Mark

8 oz T ≈ 233 g

Grain (gr)

= 64.79891 mg

Scruple (s ap)

20 gr

Dram (dr ap)

3 s ap = 60 gr

Ounce (oz ap)

8 dr ap = 480 gr

Pound (lb ap)

5760 gr = 1 lb t

Merchants/Mercantile pound

15 oz tower = 6750 gr ≈ 437.4 g

London/Mercantile pound

15 oz troy = 16 oz tower = 7200 gr ≈ 466.6 g

Mercantile stone

12 lb L ≈ 5.6 kg

Butcher's stone

8 lb ≈ 3.63 kg

Sack

26 st = 364 lb ≈ 165 kg

Thecarat was once specified as four grains in the English-speaking world.

Some local units in the English dominion were (re-)defined in simple terms of English units, such as the Indiantola of 180 grains.

Tod

This was an English weight for wool.^[32] It has the alternative spelling forms oftode,todd,todde,toad, andtood.^[33] It was usually 28 pounds, or twostone.^[33] The tod, however, was not a national standard and could vary by Englishshire, ranging from 28 to 32 pounds.^[33] In addition to the traditional definition in terms of pounds, the tod has historically also been considered to be1⁄13 of asack,1⁄26 of asarpler,^[33] or1⁄9 of a wey.^[32]

• English Customary Weights and MeasuresArchived 2008-07-24 at theWayback Machine
• Jacques J. Proot'sAnglo-Saxon weights & measures page.Internet Archive Wayback Machine
• Alexander Justice, "A General Discourse of the Weights and Measures" (London, 1707).

• Imperial units
• Customary units of measurement
• Economic history of England
• Units of measurement by country

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