The Metric System, the International System of Units, or the Système d'Unité (SI) in French, is the widely used system of measurement globally.

It is based on seven base units:

1. Length - standard unit: meter

2. Mass - standard unit: kilogram

3. Time - standard unit: second

4. Electric current - standard unit: ampere

5. Temperature - standard unit: Kelvin

6. Amount of substance - standard unit: mole

7. Luminous intensity - standard unit: candela

Mass Unit Measurement

• 1 Metric ton/Tonne = 1 000 kg

• 1 000 Kilogram (kg) = 1 000 g

• 1 000 Gram (g) = 1 kg

• 10 Decigram (dg) = 1g 

• 100 Centigram (cg) = 1g

• 1 000 Milligram (mg) = 1 g

• 1 000 000 Microgram (µg) = 1000 mg

• 1 Nanometer = 1 000 000 mg

• 1 Picometer = 1 000 000 000 mg

Length Unit Measurement

Legend: 

Measurement units in green are known by most 

Measurement units in red are less known/rarely used

• 1 Gigameter = 1 000 000 0000 m

• 1 Megameter = 1 000 000 m

• 1 Kilometer (km) = 1000 m

• 1 Decameter = 10 m

• 1 Hectometer = 100 m

• 1 Meter (m) = 100 cm

• 10 Decimeter (dm) = 1 meter

• 100 Centimeter (cm) = 1 meter

• 1000 Millimeter (mm) = 1 meter

• 1 Micrometer (μm/mc) = 1000 mm (the following are mainly used in Biology, )

• 1 Nanometer (nm) = 1 000 000 mm

• 1 Picometer (pm) = 1 000 000 000 mm

• 1 Femto (f) = 1 000 000 000 000 mm

• 1 Atto (a) = 1 000 000 000 000 000 mm

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