Temperature
Fahrenheit to Celsius: Subtract 32 from the number of Fahrenheit, then multiply by 5/9
Celsius to Fahrenheit: Multiply the number of Celsius by 9/5 and add 32.

Volume
Canadian gallon to litres: Multiply number of Canadian imperial gallons by 4.5.
Litres to Canadian gallon: Multiply number of litres by 0.22 The Canadian gallon is based on the imperial quart, which is one quarter larger than the U.S. quart (four Canadian gallons = five U.S. gallons)
Note: Measurements are approximate for easy conversion.

Distance
Miles to kilometres: Multiply number of miles by 1.6
Kilometres to miles:Multiply number of kilometres by 0.6
50km/h will apply as the speed limit in most cities and towns. It replaces 30 mph on your speedometer.
80km/h is the maximum speed limit on most rural two-lane roadways. It replaces 50 mph.
90km/h is the maximum speed limit on many highways. It replaces 55 mph.
100km/h is the maximum speed limit on some access controlled highways. It replaces 60 mph.