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While reading old history books, I am always at a loss to the units of measure used in different eras and locations. This page is to offer what I have found for others in the same position.
I hope this helps a bit.......

1 arpent of land is about 5/6 of an acre. The same term is also used for linear measure, 192 feet.

Troy Weight
24 grains =1 pennyweight
20 pennyweight =1 ounce(480 grains)
12 ounces =1 pound

Avoirdupois Weight used for all general merchandise
16 drams =1 ounce(437 1/2 grains troy)
16 ounces =1 pound
14 pounds =1 stone
28 pounds =1 quarter
4 quarters =1 hundredweight(112 pounds)
20 hundredweights=1 ton(2240 pounds
Avoirdupois pounds exceed Troy in the proportion of 17 to 14 nearly; Troy ounces are greater than Avoirdupois in the amount of 79 to 72.

Apothecaries Weight used for dispensing drugs, etc
20 grains =1 scruple
3 scruples =1 dram
8 drams =1 ounce
12 ounces =1 pound

Measures of length linear measure:
12 inches=1 foot
3 feet=1 yard
5 1/2 yards=1 pole, rod or perch
4 poles =1 chain
10 chains=1 furlong
8 furlongs=1 mile(1760 yards)
3 miles =1 league

surveyers measure:
7.92 inches=1 link
100 links=1 chain
80 chains=1 mile
10 sq chains=1 acre

Square Measure
144 sq inches=1 sq foot
9 sq feet=1 sq yard
30 1/4 sq yards=1 sq pole
40 sq poles=1 rood
4 roods=1 acre
640 acres=1 sq mile


To add to this we have an Irish, Scottish and Statute acre
1 Irish acre is about 1.2913 Statute acre
There has been some confusion about the actual size of these acres so the is a link here for you to decide for yourselves.
http://www.baronage.co.uk/bphtm-02/moa-10.html

Solid or Cubic Measure
1728 cubic inches=1 cubic foot
27 cubic feet=1 cubic yard
5 cubic feet=1 barrel bulk shipping
40 cubic feet=1 ton shipping
40 cubic feet=1 load hard timber
50 cubic feet=1 load foreign fir

Measure of Capacity used for liquids and dry goods
4 gills=1 pint
2 pints=1 quart
4 quarts=1 gallon
2 gallons=1 peck
4 pecks=1 bushel
8 bushels=1 quarter
5 quarters=1 load
36 bushels=1 chaldron

**a bushel of wheat on average weighs 60 pounds
Barley47 pounds
Oats40 pounds
the gallon contains 10 pounds (avoidupois) of distilled water

The Metric System: measure of Length
10 millimetres=1 centimetre
10 centimetres=1 decimetre
10 decametres=1 metre
10 metres=1 dekametre
10 dekametres=1 hectometre
10 hectometres=1 kilometre
10 kilometres=1 myrametre
1 metre=1.094 yards / 39.371 inches

measure of Surface
10 centiares=1 deciare
10 deciares=1 are(100 sq metres)
10 ares=1 dekare
10 dekares=1 hectare
100 hectares=1 sq kilometre
1 hectare=2 acres, 1 rood, 35 poles

measure of Weight
10 milligrams=1 centigram
10 centigrams=1 decigram
10 decigrams=1 grain
10 grains=1 dekagram
10 dekagrams=1 hectogram
10 hectograms=1 kilogram
10 kilograms=1 myriagram
1 kilogram=2 lb, 3 1/4 oz
1 pound Avoir.= .4535 kilograms

measure of capacity
10 millilitres=1 centilitre
10 centilitres=1 decilitre
10 decilitres=1 litre
10 litres=1 dekalitre
10 dekalitres=1 hectolitre
10 hectolitres=1 kilolitre
1 litre=1 3/4 pints

Some odd usefull data
1 hectolitre=22 imperial gallons
1 pood=36 pounds
1 ton(2240 lbs)=66.22 poods
1 U.S. gallon= 0.83 imperial gallons
6 U.S. gallons=5 imperial gallons
1 metric ton(1000 kg)=2204 pounds
1 metre=3 feet, 3 1/4 inches

Metric / British conversions
1 centimetre=0.3937 inches
1 decimetre=0.3281 foot
1 metre=1.0936 yard
1 dekametre=1.9884 pole
1 hectometre=0.4971 furlong
1 kilometre=0.6214 mile
1 acre=0.0988 rood
1 hectare=2.4711 acres
1 sq kilometre=0.386 sq mile
1 centilitre=0.0704 gill
1 decilitre=0.1759 pint
1 litre=0.8799 quart
1 dekalitre=2.1997 gallon
1 hectolitre=2.7497 bushel
1 centigram=0.1543 grain
1 decigram=1.5432 grain
1 gram=15.4323 grains
1 dekagram=5.6438 dram
1 hectogram=3.5274 ounce
1 kilogram=2.2046 pound
1 myriagram=1.5747 stone
1 quintal=1.9684 cwt
1 millier=0.9842 ton

Nautical Measure
6 feet=1 fathom
100 fathoms=1 cable length
6080 feet=1 nautical mile
3 nautical miles=1 sea league
60 nautical miles=1 degree

Miscellaneous Weights and Measures
1 bag of:cocoa112 lbs
coffee140-168 lbs
hops280 lbs
pepper(black)316 lbs
pepper(white)168 lbs
rice168 lbs
sago112 lbs
sugar112 - 190 lbs

1 bar gold mint = 400 oz troy

Barrels of liquors
firkin(1/2 barrel)9 gallons
kilderkin(1/2 barrel)18
barrel36
hogshead(1 1/2 barrels)54
puncheon(2 barrels)72
butt of ale(3 barrels)108
anker10
tierce42
pipe of port115
pipe of madeira92
pipe of sherry108
hogshead of brandy60
hogshead of claret45
hogshead of port57
hogshead of sherry54
hogshead of madeira46

More Misc. items:
Bushel of barley47 lbs
bushel of coal80 lbs
bushel of oats39 lbs
bushel of rye60 lbs
bushel of wheat60 lbs
chaldron of coal85 lbs
chest of cloves200 lbs
chest of tea84 lbs
cord of wood128 cubic feet
cran of herrings37 1/2 gallons
hogshead of sugar13 to 16 ctw
hogshead of tobacco12 to 18 ctw
last of herrings13,200 herrings
last of hides12 dozen
last of wool12 sacks
load of hay or straw36 trusses
long hundred of herrings33 warps or 132 herrings
matt of cloves80 lbs
peck of flour14 lbs
pig of ballast56 lbs
pocket of hops168 to 224 lbs
quarter of wheat480 lbs
sack of coal224 lbs
sack of flour280 lbs
sack of potatoes168 lbs
sack of wool364 lbs
square of flooring100 sq ft
stack of wood108 cubic ft
stone of meat8 lbs
10 hundred herrings1320 herrings
ton of hay36 trusses
truss of new hay60 lbs
truss of old hay56 lbs
truss of straw36 lbs
warp of herrings4 herrings