Metric Units (commonly referred to as SI, which stands for Système International)
Length: millimetre, centimetre, meter/metre, kilometre
Mass/weight: milligram, gram, kilogram
Volume (liquid): millilitre, centilitre, liter/litre
Temperature: Celsius
Imperial Units
Length: inch, foot, yard, mile
Mass/weight: ounce, pound, stone
Volume (liquid): pint, quart, gallon
Temperature: Fahrenheit