Art Centering Calculator
Calculate the exact horizontal centre point for artwork between two walls.
Art Centering Calculator
Preview
How to Use This Calculator
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1
Measure wall-to-wall
Measure the distance between the two walls (or boundaries) where you want to centre your artwork.
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2
Enter frame width
Input the width of your artwork or frame. The calculator instantly computes the centre point.
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3
Read the centre point
The calculator shows where the frame centre falls, measured from the left wall. The left and right edge positions are also displayed.
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4
Mark the wall
Measure from the left wall and make a light pencil mark at the centre point. This is where the nail goes horizontally.
Centring Art Between Two Points — Properly
Centring a frame sounds like the easy case, and the maths is indeed simple: the frame centre goes at half the available width, and the hook goes at the same point. The reason so many centred frames still end up visibly off is that people centre them on the wrong thing, or measure the available space wrong. This page covers the judgement calls; the calculator covers the arithmetic, including the parts people skip — like converting the frame centre into a hook position via the hook drop, and reporting how far each frame edge sits from the walls so you can sanity-check before drilling.
Centre on what, exactly?
The eye centres objects within the visual boundary, not the structural one. In practice:
- Between two corners: measure the flat wall face, corner to corner. Easy case.
- Between a window and a corner: measure from the edge of the window trim, not the glass — the architrave is what your eye reads as the boundary.
- Above furniture: centre on the furniture, not the wall. A frame centred on the wall but off-centre over the sofa looks wrong, every time. (Our Above Furniture Calculator handles this case with heights too.)
- On a wall with a door at one end: centre within the space between the architrave and the far corner — treat the door as a wall edge.
A worked example
Space: 1,840mm between a window architrave and a corner. Frame: 620mm wide, hook drop 95mm, target centre height 1,450mm.
Frame centre = 920mm from the architrave. Left edge lands at 920 − 310 = 610mm; right edge at 1,230mm, leaving 610mm of clear wall on each side — balanced. The hook goes at 920mm horizontally; vertically, the calculator adds half the frame height to your target centre height and subtracts the 95mm hook drop. It reports all of these numbers, so you can check the edge distances look sensible before making a hole.
Why the edge distances matter
The left-edge and right-edge outputs are your error alarm. If you mis-measured the available width by 50mm, the centre position will be off by 25mm — hard to spot as a number, but obvious when the two edge distances don't match what you see when you hold the frame up. Thirty seconds with the tape measure against those two numbers catches nearly every measurement blunder before it becomes a hole.
Optical centre versus mathematical centre
For horizontal centring, mathematical centre is correct. For vertical positioning, however, galleries hang art relative to eye level, not the wall's vertical centre. The convention is to put the artwork's centre at about 1,450–1,550mm (57–61 inches) from the floor regardless of ceiling height. In rooms where people mostly sit (dining rooms, snugs), drop that by 100–150mm.
Centring multiple items as one unit
To centre a pair or trio of frames in an alcove, treat the group as one object: its width is the sum of the frame widths plus the gaps between them. Centre that composite width with this calculator, then position each frame within it. For evenly-spaced rows of three or more, the Gallery Wall Spacing Calculator automates the whole layout.
Common mistakes
- Measuring at the wrong height. Walls are rarely perfectly plumb; measure the available width at the height the frame will hang, not at waist height.
- Centring the hook instead of the frame. With a centred single hook they coincide — but with offset hardware (some frames hang from one corner ring) they don't. The calculator centres the frame and derives the hook.
- Ignoring a radiator or socket. Centred-but-overlapping-a-light-switch is not a win. Check the frame's bottom edge height against anything mounted on the wall.
Frequently Asked Questions
Should I centre a frame on an alcove or on the chimney breast?
Each alcove and the chimney breast are separate visual fields — centre within whichever one the frame hangs in. Trying to relate a frame in an alcove to the room's overall centreline just makes it look off-centre in its own space.
The two walls aren't parallel — the gap is wider at the top. Where do I centre?
Measure the available width at the height of the frame's vertical centre and centre on that measurement. Out-of-parallel walls are common in older houses; centring at frame-centre height splits the difference exactly where the eye judges it.
Does the frame width include the frame itself or just the picture?
Always use the full outer width of the frame, moulding included — that's the object your eye centres. The image inside might be off-centre within its mat, and that's fine; it doesn't change where the frame should hang.
Should artwork always be centered exactly?
Not always. While centering creates visual balance, you might intentionally offset artwork in asymmetrical arrangements or when balancing with other room elements. However, when you do want centered art, precise measurements prevent the "slightly off" look that's often noticeable.
How do I centre art above furniture?
For centering artwork above sofas, consoles, or beds, use the Above Furniture Calculator. It calculates both vertical height and horizontal centering relative to the furniture, including proportion checks.
How do I mark the centre point on the wall?
Use a tape measure to find the calculated centre point from your reference (left wall or furniture edge). Mark lightly with pencil. Then use the frame centre measurement as your reference for positioning - where the frame's horizontal centre should align with your mark.