Buy the wrong size shower curtain and you end up with one that pools on the floor or gaps at the sides, letting water escape every time you shower. Learning how to measure shower curtain dimensions correctly takes just a tape measure and five minutes, and it saves you from returns and water on the bathroom floor. The standard shower curtain runs 72 by 72 inches, but tubs, stalls, and tall ceilings all call for different sizes. The goal is simple: a curtain wide enough to cover the opening with overlap and long enough to reach near the tub edge without dragging. Get both measurements right and the liner choice follows easily.
Standard Shower Curtain Sizes
Before measuring, it helps to know the common sizes you will be choosing from. Most curtains are sold in a handful of standard dimensions that fit typical American bathrooms.
- Standard: 70 to 72 inches wide by 70 to 72 inches long, the most common size for a standard tub.
- Stall: about 54 inches wide by 72 to 78 inches long, for narrow shower stalls.
- Extra-long: 72 inches wide by 84, 90, or even 96 inches long, for tall ceilings or raised rods.
- Extra-wide: 108 inches or more wide, for clawfoot tubs or large enclosures needing a wrap-around curtain.
Knowing these helps you round to the nearest available size after you measure your actual space.
What You Will Need
Measuring requires almost nothing beyond a few basics. Gather these before you start so you can record numbers as you go.
- A metal tape measure for accuracy.
- A pencil and paper or your phone to note measurements.
- A step stool if your rod is mounted high.
Measure twice to confirm each number. A small error in width or length is the difference between a curtain that fits and one that gaps or drags.
How to Measure the Width
Width determines whether the curtain covers the opening fully. Measure the length of your shower curtain rod from end to end. For proper coverage, your curtain should be wider than the rod so it has fullness and overlaps the edges, preventing water from sneaking out the sides.
A good rule is to choose a curtain that is at least the rod length, and ideally several inches wider, so it gathers slightly when closed rather than stretching flat. For a standard 5-foot tub with a 60-inch rod, a 72-inch-wide curtain gives the right overlap.
How to Measure the Length
Length keeps water inside the tub without the curtain dragging on the floor. Measure from the top of where the curtain rings will hang, usually just below the rod, down to where you want the curtain to end.
For a standard tub, the curtain should fall to about 2 to 3 inches above the inside floor of the tub or just past the tub’s outer edge. You do not want it pooling on the bathroom floor, which traps water and breeds mildew, nor riding up so high that water splashes out the bottom. Measure your rod height first, since a high-mounted rod may require an extra-long curtain.
Choosing the Right Liner
The liner is the waterproof barrier that actually keeps water in the tub, with the decorative curtain hanging on the outside. The liner should match or be slightly shorter than the curtain so it hides behind it while still doing its job.
- Match the width to your curtain so both cover the opening.
- Keep the liner length equal to or about an inch shorter than the curtain.
- Let the liner sit inside the tub while the decorative curtain stays outside.
For stall and extra-long curtains, buy a matching liner in the same size category, since a standard liner will not cover the opening correctly.
Special Situations
Some bathrooms need a different approach. Clawfoot tubs sit in the open and require an extra-wide, often wrap-around curtain on an oval rod to enclose the whole tub. Walk-in or curbless showers may need a stall-size curtain or a custom width depending on the opening.
High ceilings with a raised rod call for extra-long lengths of 84 to 96 inches. Whenever your setup differs from a standard tub, measure the actual opening and rod position rather than assuming the standard 72-by-72 will fit.
Hooks, Rods, and Hanging Height
The hardware you use influences the final hang, so factor it into your measurement. Shower curtain rings and hooks add about an inch or two between the rod and the top of the curtain, which slightly raises where the fabric starts. If you measure from the rod itself rather than from where the rings hang, you can end up with a curtain that sits higher than expected.
Rod height is adjustable in many bathrooms, and raising the rod a few inches above the standard 75 to 77 inches can make a small bathroom feel taller. Just remember that a higher rod usually calls for an extra-long curtain to maintain proper coverage down to the tub.
Fabric vs. Plastic and Other Material Notes
Material affects both how the curtain hangs and how it should be sized. Fabric curtains drape and may need an inner waterproof liner, while plastic or vinyl curtains can serve as the liner themselves. Heavier fabrics hang straighter and resist billowing, but they also benefit from a slightly fuller width for a gathered look.
- Fabric curtain: pair with a separate waterproof liner inside the tub.
- Vinyl or PEVA curtain: can double as its own liner.
- Weighted hems: help heavier curtains hang straight and stay put.
Whatever material you choose, size the liner to match so the waterproof layer fully protects the bathroom floor.
Getting the Perfect Fit
To recap the method: measure your rod length for width and choose a curtain a few inches wider for overlap, then measure from the rings down to just above the tub floor for length. Match your liner to the same dimensions, and account for stalls, tall rods, or clawfoot tubs with the appropriate specialty size.
Knowing how to measure a shower curtain correctly means no more guessing, no more curtains that drag or gap, and no more water on the floor. Spend the five minutes with a tape measure up front, and the curtain you order will fit your bathroom the first time.
