Abbreviation Prefixes For instance
 Metre - m kilo (k) - 1000 times unit mile (m) 1/1000 of unit 100 centimetres = 1 metre
10 metres = 1 decametre
 Gramme - gm hecto (h) - 100 times unit cent (c) 1/1000 of unit 100 miligramme = 1 gramme
 Litre - 1 deca (dal) - 10 times unit deci (d) 1/1000 of unit 100 Litres = 1 hectolitre
 

LENGTH
1 inch = 25.4 millimtres (mm)
1 foot = 30.48 centimetres (cm)
1 yard = 0.9144 metre (m)
1 mile = 1.6093 kilometres (km)
1 millimetre = 0.0328
1 centimetre = 0.0328 foot
1 metre = 1.094 yards
1 kilometre = 0.62137 mile
 
Centimetres   Inches
2.540 1 0.394
5.080 2 0.787
7.620 3 1.181
10.160 4 1.575
12.700 5 1.969
15.240 6 2.362
17.780 7 2.756
20.320 8 3.15
22.860 9 3.543
     
Metres   Yards
0.914 1 1.094
1.829 2 2.187
2.743 3 3.281
3.658 4 4.374
4.572 5 5.468
5.486 6 6.562
6.401 7 7.655
7.315 8 8.749
8.23 9 9.843
     
Kilometres   Miles
1.609 1 0.621
3.219 2 1.243
4.828 3 1.864
6.437 4 2.485
8.047 5 3.107
9.656 6 3.728
11.265 7 4.350
12.875 8 4.971
14.484 9 5.592

VOLUME
1 inch3 = 16.387 centimetres3
1 foot3 = 28.316 decimetres3
1 pint3 = 0.568 litre3
1 imperial gallon = 4.546 litres
1 centimetre3 = 0.0610 inch3
1 decimetre3 = 0.035 feet3
1 litre = 1.76 pints
1 litre = 0.220 imperial gallon
 
Litres   Gallons
4.546 1 0.220
9.092 2 0.440
13.638 3 0.660
18.184 4 0.880
22.730 5 1.100
27.276 6 1.320
31.822 7 1.540
36.368 8 1.760
40.914 9 1.980
     
Weight

1 ounce = 28.349 gms
1 pound = 0.4536 kg
1 stone = 6.350 kilogrammes
1 cwt = 50.80 kilogrammes
1 ton = 1.016 metric tonnes
1 gramme = 0.03527 ounce
1 kilogramme = 2.205 pounds
1 kilogramme = 0.158 stone
1 kilogramme = 0.01968 cwt
I metric tonne = 0.09842
 
Kilograms   Pounds
0.454 1 2.205
0.907 2 4.405
1.361 3 6.614
1.814 4 8.819
2.268 5 11.023
2.722 6 13.228
3.175 7 15.432
3.629 8 17.637
4.082 9 19.842

AREA
1 sq.inch = 6.4516 sq.cm
1 sq.yard 0.8361 sq.metre
1 sq.mile = 2.589 sq.kilometres
1 acre = 4047 sq.metres
1 sq.centimetre = 0.155 sq.inch
1 sq.metre = 1.1960 sq.yards
1 sq.kilometre = 0.386 sq.mile
1 hectare = 10,000 sq.metres
1 hectare = 2.471 acres
 
Sq.Metres   Sq.Yards
0.836 1 1.196
1.672 2 2.391
2.508 3 3.588
3.345 4 4.784
4.181 5 5.98
5.017 6 7.176
5.853 7 8.372
6.689 8 9.568
7.525 9 10.764
 

Easy Conversions

Metres into yards

add one-tenth

Yards into metres

deduct one tenth

Kilometres into miles

multiply by 5 and divide by 8

Miles into kilometres

multiply by 8 and divide by 5

Litres into pints

multiply by 7 and divide by 4

Pints into litres

multiply by 4 and divide by 7

Litres into gallons

multiply by 2 and divide by 9

Gallons into litres

multiply by 9 and divide by 2

Kilograms into pounds

divide by 9 and multiply by 20

Pounds into kilograms

divide by 9 and multiply by 20