Working out BTU's radiator size for a loft conversion

Hi all,

Dont know if this question has been asked before..........

I'm having my loft converted into bedrooms shortly. Iam providing a radiator for the bathroom (wife wants a fancy one, i'm just trying to figure out a price for the rad). When working out radiator size do you just work out the btu's by floor area and roof height OR do you factor in the sloping ceiling as the volume of the room is smaller than that of a normal shaped room?

Many thanks for looking!

Cheers

www.discountedheating.co.uk
try this website, will answer your questions, half way down home page on left of screen is a website for Rad sizing

as it is a bathroom it wont be a disaster if it is a wee bit too big, so i would treat it as a box and ignore the sloping roof, more hassle than it is worth taking slope into account