The Wall Spacing Calculator calculates how to spread items evenly across a wall so the gaps at both ends and between items are all equal.
The gap is gap = (W − n × item width) ÷ (n + 1). The calculator also gives the center-to-center distance, where the first item’s center goes, how many items fit with a minimum gap, and the center of the wall — handy for hanging frames, mirrors, shelves, lights, panels or wall decals.
Wall Spacing Calculator
Evenly space frames, panels, shelves or decals on a wall — equal gaps, centre-to-centre distance, and the centre of the wall.
Formula
- Equal gap: g = (W − n × w) ÷ (n + 1)
- Center-to-center: w + g
- First item center from the left: g + w ÷ 2
- How many fit: n = ⌊(W − g_min) ÷ (w + g_min)⌋
- Wall center: W ÷ 2
Where W = wall (or space) width, n = number of items, w = item width, g_min = minimum gap.
How the Calculation Works
Step 1: Subtract the total width of all items from the wall width.
Step 2: Divide the leftover space by the number of gaps — one more than the number of items, because there is a gap at each end.
Step 3: Mark the first center at one gap plus half an item from the wall edge, then step along by the center-to-center distance.
Variables Explained
| Input | Meaning |
|---|---|
| Wall width | Space you are filling (a whole wall or the width above a sofa) |
| Number of items | How many frames, shelves or panels |
| Item width | Width of each item (all the same) |
| Minimum gap | Smallest space you want between items |
Example Calculation
Given: wall 120 in wide, 3 frames each 20 in wide
Gap: (120 − 60) ÷ 4 = 15 in
Center-to-center: 20 + 15 = 35 in; first center at 15 + 10 = 25 in from the left
Result: centers at 25, 60 and 95 in
How many fit
With 20 in items and at least 6 in gaps: (120 − 6) ÷ 26 = 4.4 → 4 items
Dimensions Explained
Spacing a group, not the whole wall
To space items over a section (for example, the width of a sofa), enter that width instead of the full wall, then center the group on the section.
Hanging height
This calculator handles horizontal spacing. Hanging height is a design choice; many people center artwork around eye level.
Frequently Asked Questions
How do I evenly space pictures on a wall?
Gap = (wall width − total picture width) ÷ (number of pictures + 1).
How far apart should picture frames be?
It’s a style choice; many gallery walls use consistent gaps of a few inches. Use “How many fit” to test options.
How do I find the center of a wall?
Divide the wall width by 2 and measure from either end.
What if my items are different widths?
Add all the widths together, subtract from the wall width and divide by (items + 1).
Can I use this for shelves or lights?
Yes — any row of equal items.