Measure guide
Three measurements, then order once.
Every model on this site lists the opening it is built for. Take these three measurements first and you will match a size on the first try.
01
Measure the finished opening width
Measure wall to wall at the widest point, across the top, middle and bottom of the opening. Use the widest of the three. If the walls are tiled, measure over the finished tile, not the backer board.
02
Measure the height from the tray
Start at the highest point of the shower tray or curb and measure up to the finished ceiling or the height you want the glass to stop. Standard doors are 76 inches; add a header if the opening is taller.
03
Check the depth and wall square
Measure the tray depth from the back wall to the outer edge. Then check square: measure both diagonals of the opening. A difference of more than 3/8 inch means the walls are out of square and a framed or adjustable model is the safer choice.
Size calculator
What opening do you have?
Wall to wall at the widest point, over the finished tile.
Enter your opening width and we will show the models and sizes that fit it.
Common mistakes
- Measuring the old door instead of the opening — tile thickness alone can add half an inch.
- Ordering the exact opening width: a sliding door needs the panel to overlap the fixed panel and wall.
- Forgetting the tray curb height on a corner unit, which changes the panel drop.
- Measuring before the tile is set, then tiling afterwards.
Not sure?
Send us a photo with the tape measure in frame.
Call the showroom on 718-888-0900 with your three numbers and we will tell you which model and size fits, or what adjustment the opening needs.
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