Convert kilograms to pounds by dividing by a little more than half. One lb. is equivalent to 0.45 kg, and 1 kg is the same as 2.2 lbs.
Transfer from metric to imperial distances using multiplication. To go from miles to kilometers, multiply the miles by 1.6, and to go the other way multiply the kilometers by 0.6. A mile equals 1.6 km and 1 km is 0.6 miles.
Alternate between centimeters and inches by multiplying or dividing by 2.5. There are essentially 2.5 cm in 1 inch, and 12 inches in a foot, which is 30.4 cm.
Swap between meters and yards as the difference is not very great. A meter is 9 cm, 3.5 inches, longer than a yard.
Change from Celsius to Fahrenheit by adding 32 to the temperature and multiply by 9/5. This is not always necessary as most weather reports tend to give both. This is because the numbers are in no way related. Celsius is based on the melting and boiling points of water, and Fahrenheit is based on a stabilized temperature of equal amounts of ice, water and salt.
Switch between metric and imperial in liquids by remembering a pint is basically equivalent to ½ liter. This works out as 1 pt. equals 0.47 liters and 1 liter is 2.1 pts.
