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Grab bar placement calculator
Grab bars go 33–36 in above the floor to the top of the bar (2010 ADA Standards). Beside a toilet, the side bar is at least 42 in long, from 12 in to 54 in from the back wall; behind it, the rear bar is at least 36 in.
Where the rear bar goes
The rear bar runs at least 12 in toward the side wall from the toilet’s centerline and at least 24 in the other way. With the centerline 16–18 in from the side wall, that puts it here:
| Toilet centerline | Bar starts | Bar ends (at least) |
|---|---|---|
| 16 in | 4 in | 40 in |
| 17 in | 5 in | 41 in |
| 18 in | 6 in | 42 in |
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The bar itself
- Round bars 1.25–2 in across (609.2.1). In fractions: 1¼ to 2 in.
- 1.5 in between the bar and the wall, so a hand can’t get trapped (609.3).
- Strong enough for 250 lb pushed or pulled in any direction (609.8): fix to studs or blocking, not drywall alone.
- 12 in clear above the bar, free of shelves and dispensers.
Questions
What height should a grab bar be?
33–36 in from the floor to the top of the bar (609.4).
How long should a toilet grab bar be?
At least 42 in on the side wall and 36 in on the wall behind (604.5).
Where does the side grab bar start?
No more than 12 in from the back wall, running forward to at least 54 in from it.
Can I mount a grab bar on drywall?
Not on drywall alone. The ADA Standards ask for 250 lb in any direction, which takes studs, blocking or anchors rated for it.
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