Grab bar height: toilet, shower and tub
Mount horizontal grab bars so the top of the bar is 33–36 inches (84–91 cm) above the floor. Beside a toilet use a bar at least 24 inches (60 cm) long; in a shower add a vertical bar at the entry.
Updated: 2026-10-06 · ibigcall
The numbers come from the 2010 ADA Standards for Accessible Design, which most home-modification guidance follows. They are written for public buildings, but they describe the range in which most adults can actually use a bar, which is why occupational therapists use them at home too.
Height
Horizontal grab bars are installed 33 inches (840 mm) minimum and 36 inches (915 mm) maximum above the floor, measured to the top of the gripping surface. Lower than that and the arm cannot take weight when standing up; higher and the shoulder locks.
| Where | Height (top of bar) | Length |
|---|---|---|
| Beside the toilet | 33–36 in / 84–91 cm | at least 24 in / 60 cm (ADA side wall: 42 in) |
| Shower, long wall | 33–36 in / 84–91 cm | 24–36 in / 60–90 cm |
| Shower entry, vertical | bottom about 39 in / 100 cm | 18 in / 45 cm |
| Tub, back wall | 33–36 in above tub floor | 24 in or longer |
Diameter and clearance
A round bar of 1¼–2 inches (3–5 cm) is easiest to grip. Leave 1½ inches (about 4 cm) between the bar and the wall so the hand can close around it without scraping knuckles.
Anchoring
A grab bar is only as strong as its fixing. Screw it into wall studs or use heavy-duty anchors made for tile and masonry. Never rely on suction cups, and never use a towel rail as a grab bar: it is designed to hold towels, not a falling adult.
Vertical or horizontal?
Horizontal bars help when pushing up from a seat; vertical bars help when pulling and steadying while stepping over a tub rim. Many bathrooms need one of each: a vertical bar at the shower or tub entry and a horizontal bar on the long wall.
Measure before you buy
Measure from the floor (or tub floor) to where the top of the bar will be, check where the studs are, and note the length of free wall. Those three numbers decide which bar to buy. In Firm Ground you measure the existing bar or the spot for a new one, see it against the 84–91 cm norm, and the shopping list writes the bar length and mounting height for you.
This is general guidance, not medical advice. If someone has a specific mobility problem, an occupational therapist can fit the heights to that person.
Frequently asked questions
Is 36 inches too high for a grab bar?
36 inches (91 cm) to the top of the bar is the upper limit of the ADA range; 33–36 inches suits most adults.
How long should a grab bar beside a toilet be?
At least 24 inches (60 cm) at home; the ADA side-wall bar is 42 inches.
Can I mount a grab bar on tile?
Yes, with anchors rated for tile and masonry or into studs behind the tile.