Shower Seal Fit

Shower Door Seal Finder

Quick answer

Enter your glass thickness (1/4″–1/2″ or custom), the gap the seal must close, your door type, and where the water escapes. The finder converts fractions to decimal inches and millimeters, checks every catalog product's stated size ranges, and returns the top three matches scored 0–100 with trimming notes — plus two alternative seal types worth considering.

Data reviewed:

I don't know my glass thickness

Open the door and look at the exposed edge — that face's width is the thickness. Then:

  • Best: a caliper on the bare edge. 6.35 mm = 1/4″, 7.9 mm = 5/16″, 9.5 mm = 3/8″, 12.7 mm = 1/2″.
  • Tape measure: hold it flat across the edge, eyes level with the glass. Distinguishing 3/8″ from 1/2″ needs a straight-on view.
  • Paper trace: press a card against each face and mark both sides on paper, then measure between the marks.
  • Rules of thumb: framed sliding doors are usually 3/16″–1/4″; semi-frameless 1/4″–5/16″; frameless hinged 3/8″; heavy premium frameless 1/2″.

Full walkthrough: How to measure shower door glass thickness.

What the inputs mean

Shower door cross-section Side view of a shower door: the glass pane's width is the glass thickness; the space between the glass bottom edge and the threshold is the bottom gap, closed by a sweep's flexible wipe. threshold / curb door glass drip rail wipe glass thickness bottom gap
Measure the glass thickness across the bare edge and the bottom gap from the glass edge to the threshold with the door closed. The wipe should be 1/8″–1/4″ taller than the gap.

Glass thickness is the width of the pane's bare edge — US frameless doors are almost always 1/4″, 5/16″, 3/8″, or 1/2″. Gap is the space the seal must close: under the door for sweeps, or the vertical opening for side, bulb, and magnetic seals. If either number is a mystery, the thickness guide and gap guide get you both in about five minutes with a tape measure.

Fraction to decimal converter

Enter a fraction like 3/8 or a decimal.

Frequently asked questions

How does the compatibility score work?

Your glass thickness and gap are converted to decimal inches and checked against each product's stated min/max ranges, door-type tags, and leak-location tags. 100 = inside all ranges; 80 = fits but needs trimming to length; 60 = your measurement sits within 1/16 inch of a range limit; 30 = a risky combination such as a seal type that rarely fixes the selected leak; 0 = outside a range and hidden from results.

Why are there no prices on the result cards?

Amazon prices and stock change hourly, and republishing them goes stale immediately. Every card instead links to the live listing with a "Check price on Amazon" button, so the price you see is always current.

Can I link someone to my results?

Yes — results are encoded in the page address, so copying the URL from your browser reproduces the same inputs and matches. Result URLs are deliberately excluded from search engines; the clean finder page is the indexed one.