Why aren't the brackets at the very ends of the shelf?

A bracket flush with the shelf's own end has almost no shelf hanging past it, which looks like an afterthought and gives the end grain nothing to rest on. Insetting a few inches gives the shelf a real overhang past its support on both sides, which is also what keeps a bumped end from levering the opposite bracket out of the wall.

How many brackets does a floating shelf need?

Two for anything under about three feet, three past that — the middle one is there to stop a long shelf sagging between its end supports under a shelf's worth of books, not because the ends alone can't hold the weight.

Does this tell me if the brackets will hold?

No — it only lays out where the marks go, evenly spaced and inset from the ends. What is behind the wall at each mark decides whether it holds: a stud takes real weight, a rated heavy-duty anchor takes some, and drywall alone takes very little. Find your studs before you drill.

What height should a floating shelf be mounted at?

It depends entirely on what's under and around it — there's no single standard the way there is for a countertop or a switch plate. Common ranges run 12" to 18" above whatever surface it serves, or wherever it reads right on the wall for a display shelf with nothing below it.

Can I use this for a row of coat hooks instead of a shelf?

Yes — the layout is the same problem either way: a run of points, evenly spaced, inset from the ends. "Brackets" and "shelf width" are just what this page calls them; enter the hook count and the wall run instead and the spacing comes out the same way.

Floating shelf bracket template

Enter the shelf width and how many brackets it needs, and this spaces them evenly, inset from the shelf's own ends. Print the strip below at true size to mark the wall instead of eyeballing it. The same even-spacing layout works for any row of wall-mounted points that isn't a shelf — a run of coat hooks or pegs, evenly spaced along a wall.

Shelf width

Mounting height

Floor to the top of the shelf

Brackets

Inset from each end

How far the outer brackets sit from the shelf's own ends

Mounting height, from the floor

66"

Check what's behind the wall

This lays out the spacing, not what each mark lands on. A floating shelf carries real weight on a handful of points — land every bracket on a stud, or use anchors rated for the load, rather than trusting drywall alone.

The layout in numbers

Bracket 1From the shelf's left end: 4"
Bracket 2From the shelf's left end: 18"
Bracket 3From the shelf's left end: 32"

Marking strip, at true size

Wider than one sheet, so it prints across 6 pieces you butt together. Print at 100%, check the ruler, then hold it level against the wall at your chosen height.

Check this first

Put a tape on the printed ruler. If it does not read exactly 6 inches, the print was scaled — set the print dialog to 100% or “Actual size” and print it again. Do not cut wood from a template that failed this.

Shelf width, with bracket marks — piece 1 of 6, 0" to 6" across the strip

Hold this level at 66" from the floor and mark each bracket tick. Trim on the orange line and butt this piece to the next one — the marks either side of the join have to line up before you drill anything.

Shelf width, with bracket marks — piece 2 of 6, 6" to 12" across the strip

Shelf width, with bracket marks — piece 3 of 6, 12" to 18" across the strip

Shelf width, with bracket marks — piece 4 of 6, 18" to 24" across the strip

Shelf width, with bracket marks — piece 5 of 6, 24" to 30" across the strip

Shelf width, with bracket marks — piece 6 of 6, 30" to 36" across the strip

Printing this properly

In the print dialog, set the scale to 100% or “Actual size” and turn off “Fit to page”. Measure the printed ruler with a tape before you trust the spacing — a driver that quietly scales the page still looks right until the shelf sits unevenly on its brackets.

About mounting a floating shelf

Why aren't the brackets at the very ends of the shelf?: A bracket flush with the shelf's own end has almost no shelf hanging past it, which looks like an afterthought and gives the end grain nothing to rest on. Insetting a few inches gives the shelf a real overhang past its support on both sides, which is also what keeps a bumped end from levering the opposite bracket out of the wall.
How many brackets does a floating shelf need?: Two for anything under about three feet, three past that — the middle one is there to stop a long shelf sagging between its end supports under a shelf's worth of books, not because the ends alone can't hold the weight.
Does this tell me if the brackets will hold?: No — it only lays out where the marks go, evenly spaced and inset from the ends. What is behind the wall at each mark decides whether it holds: a stud takes real weight, a rated heavy-duty anchor takes some, and drywall alone takes very little. Find your studs before you drill.
What height should a floating shelf be mounted at?: It depends entirely on what's under and around it — there's no single standard the way there is for a countertop or a switch plate. Common ranges run 12" to 18" above whatever surface it serves, or wherever it reads right on the wall for a display shelf with nothing below it.
Can I use this for a row of coat hooks instead of a shelf?: Yes — the layout is the same problem either way: a run of points, evenly spaced, inset from the ends. "Brackets" and "shelf width" are just what this page calls them; enter the hook count and the wall run instead and the spacing comes out the same way.