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Measurement Guide
Shower Door / Bathtub Door
Follow the video and four simple steps below to measure your finished shower or bathtub opening and choose the right door size.
Watch the full video before recording your measurements.
How to Measure
Record all measurements in inches. Do not round up.
Measure After Installation
Measure only after the walls, tile, threshold, or tub deck are finished.
Measure Three Widths
Measure from wall to wall at the top, middle, and bottom.
Use the Smallest Width
Use the smallest width to choose the correct door size.
Measure the Height
Measure from the threshold or tub deck to the top of the finished wall.
Record Your Measurements
Use the appropriate diagram to record the finished opening widths and height before comparing them with the product specifications.
Before You Order
Check that the walls are vertical and the threshold or tub deck is level and stable. Then compare your smallest width measurement and finished height with the product specifications.
View the Complete Measuring Guide
Review detailed instructions, adjustable-width guidance, diagrams, and common measuring mistakes before ordering.
Ready to compare sizes?
Shop All Shower Doors →
Need Help Reviewing Your Measurements?
Send us the product name or model number, your top, middle, bottom, and finished height measurements, along with clear photos of the installation area. Our team can help you compare them with the product specifications.