Take your actual body measurements as they are more accurate than measuring over your clothes or shoes.
Feet: Use a ruler or tape measure to measure your foot (from the heel to the tip of your longest toe) Be sure to measure both feet. Many people have feet of different sizes. Fit to the larger of the two.
Remember, feet can expand over a quarter size during a full day's walk so ensure you get the right fit.
My second pair of climbing shoes after my 5:10 rogues have worn out. They lack a little in feel but make up for that in comfort, no more gritting my teeth as the hold dogs into my foot. So much more confident in them sticking to the wall too. I'm a street 10.5 and bought a 10. Seems the right size. Great shoe for my level, 18 months climbing once a week.