Two measurements decide whether a shelf looks deliberate or accidental: how high off the floor it sits, and how far it sits from the shelf above it. Both have answers.
The one rule underneath all the others
A single shelf, or the middle of a group, should land at around 57 to 60 inches from the floor, roughly eye level for a standing adult. This is the same rule galleries use to hang pictures, and it is not arbitrary: it is where a person's gaze naturally rests.
Everything below is that rule adjusted for what the shelf sits above.
Above a sofa: 10 to 12 inches above the back
Measure from the top of the sofa back, not the floor. Ten to twelve inches is the gap that reads as connected without feeling like the shelf is about to land on someone's head.
Under 8 inches and people knock it leaning back. Over 15 inches and the shelf visually detaches from the sofa and floats in the middle of the wall on its own.
If you are hanging a stack above a sofa, the lowest shelf takes the 10 to 12 inch measurement and the rest go above it.
Above a desk: 18 to 24 inches above the surface
Under 18 inches you cannot get a monitor, a lamp or your own head underneath comfortably. Over 24 inches and you cannot reach the shelf while seated, which removes the reason to have put it there.
20 inches is the number that works for most people at a standard 29 to 30 inch desk. Check it against your monitor height first, the shelf should clear the top of the screen by at least 2 inches.
Above a kitchen counter: 18 to 20 inches
This is the standard cabinet clearance and it exists for a good reason: it is the space needed to use a counter without hitting your knuckles, and it fits a kettle, a coffee machine and a mixer underneath.
Above a sink, go to 22 to 24 inches. You lean further forward at a sink and you look up more often.
Above a cooktop, leave at least 30 inches and expect the shelf to collect grease. Many people regret open shelving directly over a cooktop. If the layout forces it, an oiled hardwood surface can at least be cleaned and re-oiled, which a painted shelf cannot.
Above a bed: 24 to 30 inches above the mattress
Measure from the top of the mattress, not the headboard. Below 24 inches people sit up into it. Above 30 inches it stops relating to the bed.
Honest safety note: a shelf directly above a pillow is a shelf whose contents are above somebody's head for eight hours a night. Keep it light, frames, a book, a small plant, and hang it into studs, not into drywall anchors. If you want weight up there, put it above the foot of the bed instead. Other ways to add storage around a bed are in the small bedroom storage guide.
Above a toilet: 20 to 24 inches above the tank
Any lower and lifting the cistern lid becomes a two-stage operation. This is the single most common complaint about bathroom shelving and it is entirely avoidable.
Spacing between shelves in a stack
The spacing is set by what stands on the shelf, plus breathing room.
- 12 inches: the tightest that still works. Paperbacks, small objects, spice jars. Below this it reads as a rack.
- 14 to 16 inches: the default. Takes hardbacks upright, a medium plant, most decorative objects. If you only remember one number, remember 15.
- 18 inches: generous. Tall vases, large art leaning against the wall, stacked bowls. Use this when the shelves are the feature rather than the storage.
- 20 inches or more: only for a deliberate asymmetric arrangement, or above a counter.
Equal spacing throughout is the safe choice and always looks composed. Graduated spacing, wider at the bottom, tighter at the top, looks more considered but only works with three or more shelves, and the difference between steps should be at least 2 inches or it reads as a mistake.
Shelf length: leave the wall some margin
A shelf should not run the full width of the wall unless it is meant to read as architecture. Leave at least 6 inches of bare wall at each end.
Over furniture, the shelf should be narrower than the piece below it, about two-thirds to three-quarters of the sofa or sideboard width. A shelf wider than the furniture under it makes the furniture look undersized.
Marking it out before you drill
- Cut a strip of paper to the shelf's length and depth and tape it to the wall. Look at it from the doorway, not from two feet away.
- Leave it up for a day. Almost everybody moves it once.
- Find the studs and mark them before committing to the final height, a shelf 2 inches lower but properly fixed beats a shelf at the perfect height held by anchors.
- Use a spirit level, not the ceiling line. Ceilings are rarely level and older floors never are.
See the range, or read what a floating shelf can actually hold before you decide what goes on it.
From the Rootelier range
Organic Decorative Wall Shelf and Curved Wall Shelf, or see all floating shelves. Every piece is made to order, so sizes can be adjusted to the room.