Imperial units

The imperial system of units, imperial system, or imperial units (British Imperial or Exchequer Standards in 1826) is the system of units first used in the UK Weights and measures acts.

Length Unit

Legend: 

Measurement units in green are known by most 

Measurement units in red are less known/rarely used

• 1 twip 

• 1 thou (th)

• 1 barleycorn 

• 1 inch (in/'') =  

• 1 hand (hh)

• 1 foot (ft) = 12 in = 

• 1 yard (yd) = 3 ft = 36 in = 

• 1 chain (ch)

• 1 furlong (fur) 

• 1 mile (mi) =  = 63360 inch = 

Conversion to Metric Unit

• 1 inch (in/'') = 25.4 mm = 2.54 cm = 0.0254 m      

• 1 foot (ft) = cm =  m

• 1 yard (yd) = 36 in = 91.44 cm  

• 1 mile (mi) =  160934.4 cm

Mass/Weight Unit

• 1 Ounce (oz) = 1/16 pound

• 1 Pound (lb)= 16 ounces

• 1 Stone (st) = 14 pounds

• 1 Hundredweight (cwt) (short) = 100 pounds

• 1 Ton = 2,000 pounds

Volume Unit

• 1 Cup (oz) = 1/16 pound

• 1 Pound (lb)= 16 ounces

• 1 Stone (st) = 14 pounds

• 1 Hundredweight (cwt) (short) = 100 pounds

• 1 Ton = 2,000 pounds

Metric and Imperial Conversions

conversion in new units

value in old unit x ______________________

conversion in old units

E.g. 8 ft to in

   12

8 x  ____

  1