Calculating image size



I am very new to all this, so sorry if this is a daft question:

I would like to calculate the image size thrown by a particular projector at a particular distance. Is there a way of doing this, or alternatively is there some sort of calculator out there somewhere, or is it adjustable with the lens?

E.g. Sharp XV-Z7000 Projection size 40" to 250" (from Sharp site) - but at what distances?

Thanks for any help!

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