How do I measure my room for an item I do not have yet?

I have a picture and the dimensions (46.7 x 45.0 x 23.5 inches) of the bed. I need to measure my room to see if it fits, how do I do this? or:I have a

I have a picture and the dimensions (46.7 x 45.0 x 23.5 inches) of the bed. I need to measure my room to see if it fits, how do I do this?

or:I have a picture and the dimensions (46.7 x 45.0 x 23.5 inches) of the bed. I need to measure my room to see if it fits, how do I do this?

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