Picture Frame Sizes Explained: Standard Sizes in CM, What Fits Where, and How to Measure Your Wall

Most frame size guides assume you already know what fits your wall. You don't, and that's fine. This is the practical version: standard sizes in centimetres and inches, a tape measure method that takes ten minutes, and clear advice on what to hang where.

Standard picture frame sizes in CM and inches

Here's the quick reference. Print it, screenshot it, send it to your group chat. These are the sizes you'll actually encounter when shopping for art prints and frames.

Frame size (cm)	Inches (approx)	Best for
21 x 29.7 (A4)	8.3 x 11.7	Desks, gallery walls, small wall gaps
30 x 40	11.8 x 15.7	Hallways, bedside walls, kitchens
30 x 42 (A3)	11.7 x 16.5	Versatile mid-size, gallery walls
40 x 50	15.7 x 19.7	Above bedside tables, console tables
50 x 50	19.7 x 19.7	Square format, modern interiors
50 x 70	19.7 x 27.5	Living rooms, bedrooms, statement piece in small rooms
61 x 91 (A1-ish)	24 x 36	Above sofas, large bedroom walls
70 x 100	27.5 x 39.4	Genuine statement pieces, big walls
100 x 150 (canvas)	39.4 x 59	Loft walls, double-height spaces

A quick visual: A4 is roughly the size of a piece of office paper. 50x70cm is about the size of a large pillow. 70x100cm is closer to a coffee table top stood on its end. If you're working in your head, that's the scale to picture.

One note on inches versus centimetres. UK and European standards run on the metric system, while a lot of online frame content is American. If you're buying a print sized in centimetres, buy a frame sized in centimetres. Mixing the two is the single most common reason a print arrives and doesn't fit.

What does 'A4 frame' actually mean, and does it include the mount?

A4 picture frames are designed to hold a piece of A4 paper, which is 21 x 29.7cm (8.3 x 11.7 inches). The frame itself is bigger than that because of the moulding around the edge, but the opening, where your print sits, is sized to A4 exactly.

Here's the part that confuses everyone. If you want a mount (also called a mat, the white border around the print inside the frame), the print needs to be smaller than the frame opening. So an A4 print with a mount needs an A3 frame. An A3 print with a mount needs an A2 frame. The mount eats into the visible area.

Frames also have something called a lip or rabbet, the inner edge of the frame that overlaps the print by a few millimetres. This is structural, it's what holds the print in place, and it means the visible image is always slightly smaller than the paper itself. Usually around 3 to 5mm on each side. Worth knowing if your image has detail right at the edge.

If you want the simplest possible setup, buy a print and frame sized to match, with no mount. The whole image is visible, the frame fits, no maths required. Our framed prints arrive with the print already fitted properly inside the frame, ready to hang, no separate frame purchase needed.

How to measure your wall for a single statement piece

This is the bit most guides skip. Choosing a frame size starts with the wall, not the print.

Step 1: Measure the available wall space. Use a tape measure to find the width and height of the empty wall area. Not the whole wall, just the bit where the art will go. Write it down.

Step 2: Subtract breathing room. Art shouldn't fill a wall edge to edge. Leave at least 15 to 20cm of clear wall on each side and roughly the same above and below. So if your wall section is 200cm wide, your art shouldn't be wider than about 160cm.

Step 3: Consider eye level. The centre of the artwork should sit roughly 145 to 150cm from the floor. This is gallery standard and it works because it matches average standing eye level. Above furniture, aim for 15 to 25cm of gap between the top of the sofa or sideboard and the bottom of the frame.

Step 4: Mock it up with painter's tape. Stick painter's tape on the wall in the exact dimensions of the frame you're considering. Step back. Take a photo on your phone. Live with it for a day if you can. This sounds excessive. It isn't. It will save you returning a frame.

A useful reverse calculator: for a wall section 150cm wide, look at frames 90 to 100cm wide. For 200cm wide, 120 to 140cm. For a narrow 80cm gap, 50 to 60cm.

How to measure for a gallery wall or set of 3

Wall art sets and gallery walls follow slightly different rules. You're not sizing one frame, you're sizing a composition.

For a set of three matching frames hung in a row, treat the whole arrangement as a single piece of art. Measure the total width including the gaps between frames. Most people use a 5 to 8cm gap between frames, which looks intentional without feeling cramped.

So three 30x40cm frames hung in a row with 6cm gaps gives you a total width of 102cm. That's the number you compare against your wall, not the size of one frame.

For a proper gallery wall with mixed sizes, lay everything out on the floor first. Move the frames around until you find a balance. The trick that designers use: trace each frame onto kraft paper or newspaper, cut the shapes out, and tape them to the wall. You can rearrange in seconds, see the spacing properly, and only commit to nail holes when you're sure.

Keep the gaps consistent. Uneven spacing is what makes gallery walls look chaotic instead of curated. Aim for the same gap, usually 5 to 8cm, between every frame.

The two-thirds rule: sizing frames to furniture, not walls

If your art is going above furniture, the wall is no longer the reference point. The furniture is.

The rule, used by interior designers as a working standard, is that art should be roughly two-thirds to three-quarters the width of the furniture beneath it. Smaller than that and the art looks marooned. Larger and it overpowers the piece below.

Worked examples:

• A 180cm sofa wants art (or a grouping of art) that's 120 to 135cm wide.
• A 120cm sideboard wants art around 80 to 90cm wide.
• A 90cm console table wants art around 60 to 70cm wide.
• A 140cm bed (double) wants art around 95 to 105cm wide.
• A 180cm bed (king) wants art around 120 to 135cm wide.

This is where 70x100cm frames earn their place. They sit beautifully above a standard three-seater sofa or a king bed, hitting that two-thirds mark almost exactly.

For a gallery wall above furniture, the same rule applies to the whole arrangement. Three 50x70cm frames in a row come in at around 162cm total width with gaps, perfect above a standard sofa.

When to go big (and when a smaller frame hits harder)

The default mistake is going too small. A 30x40cm print on a vast empty wall looks like a postage stamp. If a piece is meant to be the focal point of a room, go one size larger than your instinct says.

Reach for large wall art, 70x100cm or above, when:

• The wall is over 2.5 metres wide
• The room has high ceilings
• It's the only piece of art in the room
• You want it visible from across an open-plan space
• It's hanging above a sofa, bed, or large dining table

Stick smaller (50x70cm or less) when:

• It's part of a gallery wall
• The wall is narrow or interrupted by doors and windows
• You're filling a corner, alcove, or bedside spot
• The room is intimate, like a snug or small bedroom
• You want quiet detail rather than presence

Smaller frames hit harder in close quarters. A beautifully detailed 30x40cm print at eye level beside a reading chair has more impact than a giant print you barely glance at because it's too far away to read.

A note on canvas. If you want maximum scale, canvas goes bigger than framed prints, up to 100x150cm, and weighs less than a framed print of the same size. Useful for double-height walls or anywhere you'd struggle to hang something heavy.

Our size recommendations room by room

Living room

The living room is where you go big. The sofa wall almost always benefits from a single statement piece at 70x100cm, or a set of two or three 50x70cm prints. Hang the bottom edge 15 to 25cm above the back of the sofa.

Above a fireplace, match the width of the mantel as your upper limit. A 60x80cm or 70x100cm frame in portrait orientation usually works. Avoid anything wider than the mantel itself.

For empty corners, a single tall portrait frame at 50x70cm or 70x100cm gives the room vertical lift, especially with high ceilings.

Bedroom

Above the bed is the obvious spot, and the two-thirds rule applies. King bed: 120 to 135cm of frame width, which is one 70x100cm landscape print or a pair of 50x70cm portraits side by side. Double bed: 95 to 105cm, which is one 60x80cm landscape or three 30x40cm portraits in a row.

Hang the bottom edge 15 to 20cm above the headboard. Any closer and it looks cramped, any further and the connection between bed and art breaks.

For bedside walls, 30x40cm or 40x50cm portrait frames work beautifully. They sit at eye level when you're in bed.

Hallway

Hallways are the natural home of gallery walls. Long, narrow, and often under-decorated. A run of mixed frames in 21x29.7cm, 30x40cm, and 40x50cm sizes works well, hung at consistent eye level rather than following the slope of stairs.

If your hallway is short, a single 50x70cm portrait frame at the end of it draws the eye and makes the space feel intentional rather than wasted.

Home office

Behind your desk, on the wall you see when you look up from your laptop, go for one substantial piece. 50x70cm or 60x80cm. Something you actually want to look at, since you'll be looking at it more than most art in the house.

Avoid the busy gallery wall in a workspace. Visual noise behind you is fine. Visual noise in front of you, in your eyeline all day, becomes exhausting.

For shelf-leaning rather than hanging, smaller A4 or 30x40cm frames look great propped against a wall on a shelf or credenza, layered slightly with books or objects in front.

A few common mistakes to avoid

Buying a frame in inches when your print is in centimetres. Always match the unit.

Forgetting the mount. If you want a white border, the frame needs to be one size larger than the print.

Ordering before measuring the wall. Ten minutes with a tape measure saves a 99-day return.

Going too small. The instinct is almost always to err small. Err larger.

Buying the frame and print separately and hoping they fit. Frames sold separately from prints often warp, sag, or arrive with the print poorly fitted. Buying them together, properly fitted in one box, is genuinely worth doing.

The frame size question isn't really about millimetres. It's about whether the piece feels right in the room. Measure the wall, apply the two-thirds rule to your furniture, mock it up with painter's tape, and trust the result.