heating radiator system

what formula should you use to calculate how big a central heating radiator should be in a room.?

I need to buy the radiators for my central heating and in a diy shop I saw this formula based on size of room, use of room, windows and doors etc but forgot to write it down and can't find it anywhere on the internet. Can you help please?


You probably saw this Heat Loss Calculator' I've posted it about three times now!

http://www.trademate.co.uk/Services/Heat Loss/default.asp?_brand=CP

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