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A quick and easy way to calculate the size of the radiator required for any room in your house is by measuring the room in cubic feet and then applying the following factors to the figure arrived at:

Lounges and dining rooms Multiply cubic feet by 5
Bedrooms Multiply cubic feet by 4
Common areas and kitchens Multiply cubic feet by 3
For rooms facing north Add 15%
For French windows Add 20%
For double glazing Deduct 10%

This will give you the output of any radiator in BTUs (British Thermal Units). Adding the total for all the rooms in your house or flat  will give you the demand in BTUs for the whole house. Add 20% to the total for a hot water circulating tank and 10% for general losses. This will give you the boiler size you need for your house.

What size radiator do I need: click here
What size boiler do I need:     click here