The Belgian unit of currency is the Euro (EUR l €).
Today’s exchange rate: http://www.ecb.int/stats/exchange/eurofxref/html/index.en.html

Currency on 3 January 2012

• 1 kilometre = 0.62139 miles : 1 mile = 1.6093 kilometres
• 1 metre = 1.0936 yards : 1 yard = 0.9144 metres
• 1 metre = 3.2808 feet : 1 foot = 0.3048 metres
• 1 millimetre = 0.03937 inches : 1 inch = 25.4 millimetres

• 1 square kilometre = 0.3861 square miles : 1 square mile = 2.5899 square kilometres
• 1 hectare = 2.471 acres : 1 acre = 0.4047 hectares
• 1 square metre = 1.196 square yards : 1 square yard = 0.836 square metres
• 1 square metre = 10.764 square feet : 1 square foot = 0.0929 square metres
• 1 square millimetre = 0.00155 square inches : 1 square inch = 645.2 square millimetres

• 1 cubic metre = 1.308 cubic yards : 1 cubic yard = 0.7646 cubic metres
• 1 cubic metre = 35.315 cubic feet : 1 cubic foot = 0.02832 cubic metres
• 1 cubic millimetre = 0.00006102 cubic inches : 1 cubic inch = 16387.064 cubic millimetres
• 1 litre = 0.0353 cubic feet : 1 cubic foot = 28.137 litres
• 1 litre = 0.2642 US gallons : 1 US gallon = 3.785 litres
• 1 litre = 0.22 UK gallons : 1 UK gallon = 4.5454 litres

• 1 tonne = 0.9842 tons (long) : 1 long ton = 1.016 tonnes
• 1 tonne = 1.1024 tons (short) : 1 short ton = 0.9071 tonnes
• 1 kilogram = 2.2046 pounds (avoirdupois) : 1 pound = 0.4536 kilograms
• 1 gram = 15.432 grains : 1 grain = 0.0648 grams
• 1 grain (avoidupois) = 1 grain (troy) = 1 grain (apothecaries) 

• Celsius to Fahrenheit = (9/5 x temp C) + 32
• Celsius to Kelvin = temp C + 273.15
• Fahrenheit to Celsius = (5/9) x (temp F - 32)
• Fahrenheit to Kelvin = (5/9) x (temp F + 459.67)