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Shelf Pin Spacing Calculator

Hole count, pitch and exact positions for adjustable shelf pins, laid out so both rows line up and the shelf never rocks.

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The cabinet
The full interior height of the side panel.
The layout
Leave a gap: you will never put a shelf right at the base.
Hole pitch
32 mm is what European hardware and most drilling jigs are built around.
37 mm is the system standard, which is 1-7/16 in.
Pin
Units
Measurement system

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Results

front edge → left1.5 in1.3 in3 in20 holes per row

One panel, drawn to scale. Shaded bands are the margins you asked to leave clear.

Drill
20 holes per row at 1.26 in (32 mm)
80 holes in total across 2 panels, 1.46 in (37 mm) from each edge
The layout
Holes per row
Over 24 in of usable panel
20
Pitch
Shelf height adjusts in these steps
1.26 in (32 mm)
First hole
From the bottom of the panel
3 in
Last hole
3.1 in below the top
26.9 in
The job
Total holes
2 rows x 2 panels
80
Front row setback
From the front edge
1.46 in (37 mm)
Rear row setback
10.5 in from the front, measured back from the rear edge
1.46 in (37 mm)
Pins to buy
3 shelves x 4 corners, plus spares
12
Drill depth
Use a stop collar
0.5 in
iTwo rows per panel, four holes per shelfA shelf needs a pin at each corner, so every panel gets a front row and a rear row at the same heights. One row makes the shelf pivot and tip when it is loaded at the front.
✓32 mm system pitchEvery commercial jig, hinge plate and drawer runner is built to this pitch, so later hardware lands on the holes you are drilling now. It is the reason to use it even in an imperial shop.
iDrill from one face, alwaysReference every hole from the same edge and the same face of each panel. Flipping a panel mirrors the setback, and a rear row that is a sixteenth out on one side makes every shelf rock.
iUse a depth stopFor a 0.2 in pin, drill about 0.5 in deep. Through a 3/4 in panel there is little margin, and a hole that breaks through the show face cannot be hidden.
iShelf height adjusts in 1.3 in stepsThat is the practical resolution of the cabinet. If a specific shelf height matters, check it lands on a hole before drilling rather than after.

Working

  1. usable band = 30 - 3 bottom - 3 top = 24 in
  2. holes per row = floor(24 / 1.2598) + 1 = 20
  3. last hole = 3 + (20 - 1) x 1.2598 = 26.94 in
  4. rear row = 12 - 1.4567 = 10.54 in from the front edge
  5. total holes = 20 x 2 rows x 2 panels = 80
  6. pins = 3 shelves x 4 = 12

Quick answer

Shelf pin holes go in two rows per panel, front and rear, at the same heights, so each shelf lands on four pins. The standard pitch is 32 mm, which is what commercial jigs and European hinge hardware are built around, with the rows set back 37 mm from each edge and 5 mm holes.

holes per row = floor((panel height - bottom margin - top margin) / pitch) + 1

Worked example

A 30 in tall by 12 in deep cabinet side, holes from 3 in above the base to 3 in below the top, on the 32 mm system.

Working

  1. usable band = 30 - 3 bottom - 3 top = 24 in
  2. holes per row = floor(24 / 1.2598) + 1 = 20
  3. last hole = 3 + (20 - 1) x 1.2598 = 26.94 in
  4. rear row = 12 - 1.4567 = 10.54 in from the front edge
  5. total holes = 20 x 2 rows x 2 panels = 80
  6. pins = 3 shelves x 4 = 12

Twenty holes per row, eighty in the cabinet. That is a lot of drilling for three shelves, which is the argument for a jig: the count is high and every one of them has to be in the same place on both panels or the shelves rock.

Holes per row by panel height

Holes in one row. Double it for the two rows on a panel, then double again for a pair of sides.

Panel heightMarginUsable band32 mm1 in2 in
24 in3 in18 in151910
30 in3 in24 in202513
36 in3 in30 in243116
48 in4 in40 in324121
60 in4 in52 in425327
72 in6 in60 in486131

A tighter pitch means finer shelf adjustment and a lot more drilling. Two inch pitch is plenty for a pantry; 32 mm is worth it where hinge and runner hardware has to share the holes.

At a glance

What it doesHole count, pitch, setback and positions for adjustable shelf pins
Inputs neededPanel height and depth, margins, pitch, setback, number of shelves
Main outputHoles per row and total holes
Formulaholes = floor((height - margins) / pitch) + 1
CategoryHome & DIY
CostFree, no sign-up, no download

How to use the Shelf Pin Spacing Calculator

  1. Measure the interior height and depth of the side panel.
  2. Set margins at top and bottom. Three inches is usual; there is no point in holes where a shelf will never go.
  3. Choose the pitch. Use 32 mm if any European hinge or runner hardware will share the panel.
  4. Reference every hole from the same edge and the same face on both panels, so the rows mirror correctly.
  5. Use a depth stop. Through a 3/4 in panel there is very little margin before a 5 mm bit breaks through the show face.

Frequently asked questions

What is the standard shelf pin hole spacing?

32 mm on centre, which is the pitch the whole European cabinet hardware system is built around. Imperial shops often use 1 in or 2 in instead, which is fine for shelves alone but will not line up with hinge plates or drawer runners.

How far from the edge should shelf pin holes be?

37 mm, or about 1-7/16 in, from the front edge and the same from the back. That setback is part of the 32 mm system, and it keeps the rear row clear of a typical back panel rebate.

What size are shelf pin holes?

5 mm for the system standard, or 1/4 in for common imperial pins. They are not interchangeable: a 5 mm pin in a 1/4 in hole rattles and lets the shelf shift under load.

Do I need two rows of holes?

Yes, front and rear on each panel, so four pins carry each shelf. A single row lets the shelf pivot about the pins and tip forward the moment it is loaded at the front edge.

How deep should shelf pin holes be?

About two and a half times the pin diameter, so roughly 1/2 in for a 5 mm pin. Use a stop collar or a jig with a depth stop, because a 3/4 in panel leaves very little material behind the hole.

Why do my shelves rock?

Almost always because one row is out of alignment with the other, which happens when a panel is flipped and the setback mirrors. Reference every hole from the same face and the same edge, and mark that face before you start.

Positions are exact arithmetic from the values entered. Panel thickness, back panel rebates and hinge hardware all constrain where a rear row can safely go, so check the drill depth against your actual panel before committing to a full set of holes.

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