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Tips & tricks

Poster sizes explained: 30×40, 50×70 and 70×100

Above the sofa, the bed or a desk: how I choose a size, and why most people should start with 50×70.

Written by

Linus Jacobsson · Founder

28 October 2026

Linus started Posterva to make good wall art simple — prints, sizes, frames and how to hang them.

The most common mistake I see is a print that is too small. A 30×40 alone above a sofa looks like it is waiting for company. My rule of thumb: art above furniture should be about half to two thirds as wide as the furniture.

50×70: where most people should start

It holds a wall without taking over the room. Above a standard three-seater, a bed or a sideboard, 50×70 is almost always right.

50×70 above a dining table
50×70 above a dining table

30×40: desks, hallways and pairs

Good on a narrow wall between two doors, above a desk, or leaning on a shelf. Two or three side by side work above a sofa, as long as the gaps are the same.

70×100: when you have the wall for it

It needs a big, calm wall with no light switches or shelves around it. One 70×100 does more for an open living room than three medium prints competing for attention.

A4 and 40×50

A4 (21×29.7) is nice in a small frame on a bookshelf or bedside table. 40×50 is a good in-between size for a children's room or a kitchen.

SpotWhat I would choose
Above the sofa50×70, or two 30×40
Above the bed50×70 or 70×100
Desk or shelf30×40 or A4
Hallway30×40 or 50×70 portrait
Big empty wall70×100
30×40 above a desk
30×40 above a desk

Leave about a hand's width between the furniture and the bottom of the frame. If you are torn between two sizes, choose the larger one. It is rarely the wrong choice. When it is time to hang it, here is how I do it without damaging the wall.

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