## SI units

International System of Units (SI)

The seven SI base units

## 1 Kilometre = 1000 metres

To convert from metres to kilometres, multiply by 1000.

To convert from kilometres to metres, divide by 1000.

### Change Km to m X 1000 1 Km = 1000 m 5 Km = 5000 m 3.7 Km = 3700 m 13.9 Km = 13900 m

 Change m to Km ÷ 1000 900 m = 0.9 Km 1900 m = 1 .9 Km 33400 m = 33.4 Km

1 metre = 100 centimetres

To convert from metres to centimetres, multiply by 100.

To convert from centimetres to metres, divide by 100. Change m to cm X 100 1 m = 100 cm 10 m = 1000 cm 5.4 m = 540 cm 10.2 m = 1020 cm

 Change cm to m ÷ 100 8 cm = 0.08 m 71 cm = 0.71  m 3400 cm = 34 m

1 centimetre = 10 millimetres

To convert from centimetres to millimetres, multiply by 10.

To convert from millimetres to centimetres, divide by 10. Change cm to mm X 10 1 cm = 10 mm 5 cm = 50 mm 8.7 cm = 87 mm 15.2 cm = 152 mm

 Change mm to cm÷ 10 5 mm = 0.5 cm 55 mm = 5 . 5 cm 555 mm = 55. 5 cm

### Imperial to Metric

1 inch = 2.54 cm
1 foot = 0.3048 m
1 mile = 1.609344 x 103 m

### Imperial units

12 inches = 1 foot
3 feet = 1 yard
22 yards= 1 chain
10 chains = 1 furlong
8 furlongs = 1760 yards = 1 mile
6080 feet = 1 nautical mile
6 feet = 1 fathom

## Mass 1 Tonne = 1000 Kilogrammes

To convert from tonnes to kilogrammes, multiply by 1000.

To convert from kilogrammes to tonnes, divide by 1000. Change Tonnes to Kilogrammes X 1000 1 Tonne = 1000 Kg 2 Tonnes = 2000 Kg 0.8 Tonne = 800 Kg Change Kilogrammes to Tonnes ÷ 1000 185 Kg = 0.185 Tonnes 2kg = 0.002 Tonnes 1450 Kg = 1.45 Tonnes

1 kilogramme = 1000 grammes

To convert from kilogrammes to grammes, multiply by 1000.

To convert from grammes to kilogrammes, divide by 1000. Change Kilogrammes to grammes X 1000 5 Kg = 5000 g 0.8 Kg = 800 g 5.47 Kg = 5470 g Change grammes to Kilogrammes ÷ 1000 4500 g  = 4.5 Kg 152 g  = 0.152 Kg 1450 g = 1.45 Kg

1 gramme = 1000 milligrammes

To convert from grammes to milligrammes, multiply by 1000.

To convert from milligrammes to grammes, divide by 1000. Change grammes to miligrammes X 1000 20g = 20,000 mg 450 g = 450,000 mg       42.5 g = 42500 mg Change miligrammes to grammes ÷ 1000 45 mg  = 0.045 g 152 mg  = 0.152 g 1450 mg = 1.45 g

### Imperial to Metric

1 ounce = 2.834952 x 10-2 kg
1 pound = 0.45359237 kg
1 stone = 6.350293 kg

### Imperial units

6 ounces (oz) = 1 pound
14 pounds (lb) =  1 stone
28 pounds = 1 quarter
4 quarters = 1 hundredweight
20 hundredweight (cwt) = 1 ton

## VOLUME 1 Litre  = 100 Centilitres ( cl )
= 1000 millilitres ( ml )
= 1000 cubic centimetres ( cm3 )

1 Cubic Metre (m3)  = 1000 Litres

To convert from cubic metres to litres, multiply by 1000.

To convert from litres to cubic metres, divide by 1000. Change m3 to L                 X 1000 2  m3  = 2000 L 75  m3 = 75000 L 0.08  m3  = 80 L Change L to m3 ÷ 1000 45 L = 0.045  m3   5 L = 0.005  m3   7544 L = 7.544  m3

1 centilitre  ( cl ) = 10 mililitres

To convert from centilitres to millilitres, multiply by 10.

To convert from millilitres to centilitres, divide by 10. ### Imperial to Metric

1 fluid ounce = 2.841306 x 10-5 m3
1 gallon = 4.54609 x 10-3 m3
1 gallon USA = 3.785412 x 10-3 m3

20 fluid ounces  (fl. oz) = 1 pint
2 pints (pt) = 1 quart
4 quarts = 1 gallon

One gallon is the volume occupied by exactly 10 pounds of water of density 0.988859 gram per millilitre , weighed in air of density 0.001217 gram per millilitre against weights of density 8.136 grams per millilitre.