Flush against the bed is not a compromise. It's correct.

The bed that meets the wall is not the mattress

Mattress sizes are standardised. Beds are not. A frame adds 2–5″ on each axis, and it is the frame that touches the nightstand. Our bedroom guide publishes a plan-at width for each size, and those are the numbers this calculator uses when you pick the typical frame.

A wingback headboard or an upholstered surround adds more again, and a low platform adds close to nothing. When you shop a real bed, the listing's outer frame width is the number that matters, not the mattress size on the box.

Nightstand widths, and the gap that is allowed to be zero

The distance from the nightstand to the bed is 0–12″, and the important half of that is the zero. Flush against the bed is correct — it is not a squeeze you are tolerating. That single fact retires a whole class of false alarm, because a nightstand four inches from a mattress gets judged against a walkway figure by almost every layout tool there is, and told it fails.

The reason it is not a walkway is that it is a different kind of gap. The literature calls it a pairwise constraint: a recommended distance between two objects, as opposed to a clearance, which is free space around one. The source is Merrell, Schkufza, Li, Agrawala & Koltun, Interactive Furniture Layout Using Interior Design Guidelines (ACM TOG 30(4), 2011), which attributes its figures to Panero & Repetto's Anatomy for Interior Designers. We verified the paper directly and could not verify Panero & Repetto, whose copy is lending-restricted — so this is a real citation through peer review and it is not a primary one. Convention, not standard.

The same leftover does two jobs

This is the part worth reading twice, because it is where the arithmetic bites. The wall run minus the bed leaves a number, and that number gets split two ways — and each half is both the nightstand's home and the walking room beside the bed. They are measured in the same direction. They are the same inches.

• Walking room beside a bed: 24–30″ per side. Enough to walk, to make the bed, and to open a drawer. 36″ where a side is the main route through the room.
• The nightstand sits inside that strip, at the head end only. A nightstand is 16–19″ deep against a bed that is 75–89″ long, so it narrows the strip for about a fifth of its length.
• That pinch is a dead end, not a route. There is nothing on the far side of a nightstand but the headboard wall, so nobody is trying to walk past it. This is why a wide nightstand in a narrow strip is a real option rather than an obstruction.
• The foot of the bed is a walkway and takes a walkway's numbers: 36″ where it is the route, never under 30. That is a different wall and this page does not measure it.

Worked: a 12-foot headboard wall is 144″. A queen plans at 65, leaving 79″ in total — 39½″ per side. That clears the 24–30″ band on both sides comfortably, and it takes the widest 32″ nightstand on each side, which is 64″ of the two of them together and leaves 15″ of bare wall in total.

When two will not fit

Push the bed toward one wall. It is the oldest move in the book and it is often right: two unusable gaps become one usable one, and the whole leftover goes to the open side. A 100-inch wall with a queen on it gives 17½ inches a side, which holds nothing; the same wall with the bed pushed over gives 35 inches on one side, which holds the widest 32-inch nightstand we publish and leaves 35 inches of walking room beside the bed — above the 24–30 inch band.

What it costs is real. The bed can only be made from one side, and only one person gets a lamp and a place to put their glasses. Most couples will not accept that for long. In a child's room, a small guest room, or a bed under a dormer, it is simply the answer.

The other moves, in the order they usually help: a smaller bed (a full plans at 58 against a queen's 65 — seven inches of wall back), narrower nightstands (an 18 instead of a 28 gives ten inches back per side, twenty in total), a wall-mounted shelf instead of a nightstand on the tight side, or moving the bed to a different wall entirely and giving up the window.

One figure we will not give you

Every nightstand article on the internet says the top should sit within an inch or two of the mattress. We went looking for the source of that and did not find one — and our own older bedroom guide states it without a source, which is exactly the kind of thing we would rather admit than repeat. It is on our do-not-publish list, so this page does not give you a nightstand height.

What we will assert is the width arithmetic above, the published bed and nightstand footprints, and the 0–12″ pairing distance with its provenance stated. Everything else on the subject is taste, and taste does not need a calculator. Full write-ups: bed sizes & clearances and bedroom sizes — what fits.