Sizing guide
Walk-in tub dimensions and sizes
Most walk-in tubs are built to fit the 60-inch alcove your current tub sits in. Here's how to check.
Quick answer
A standard walk-in tub is 48 to 60 inches long, 30 to 32 inches wide and about 38 inches tall, made to fit a 60 by 30 or 32 inch alcove, per Retirement Living1.
| Size | Length | Width | Height |
|---|---|---|---|
| Compact | 36–47 | 28–30 | 30–35 |
| Standard | 48–60 | 30–32 | 38 |
| Bariatric | 53–60 | 33–35 | up to 50 |
| Extra tall or deep | 52–60 | 30–32 | 45–50 |
| Two-person | 60–80 | 32–36 | 38–40 |
Source: Retirement Living.
Other measurements that matter
- Step-in height: 3 to 6 inches, versus up to 20 inches over a standard tub wall.
- Seat height: 17 to 24.5 inches.
- Door width: from about 15.75 inches on compact models up to 32 inches on wheelchair models.
- Clearance: an outswing door needs about 36 to 60 inches of floor in front of the tub.
- Delivery path: doorways, halls and stairs need roughly 28 to 34 inches.
As one brand example, Kohler lists a 52 by 28 inch frame that customizes up to 60 by 32, with a 3-inch step-in and a 17-inch seat2.
How to measure your bathroom
- Measure the alcove's length along the back wall, and its width from wall to the tub's front edge.
- Measure the narrowest point of the bathroom door and every hallway the tub will travel.
- Note which end the drain is on. It sets the door's hinge side.
- Measure floor space in front of the tub for an outswing door.
- Check your water heater's size in gallons.
Short on space? See small and compact tubs.
Questions people ask
Will a walk-in tub fit where my bathtub is now?
Usually yes. Most models are built for the standard 60-inch alcove. Smaller tubs may need filler panels to close the gap.
Sources
- Retirement Living, Walk-In Tub Dimensions. Accessed November 10, 2026.
- Kohler Co., KOHLER Walk-In Bath: Dimensions. Accessed November 10, 2026.
Every price on this page comes from these sources through our published rate card. We open each source before citing it.