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Shelf spacing calculator

How tall will each shelf opening be?

Before you startMeasure only the clear inside height and the actual shelf-board thickness.
Step 1

Add your measurements

Divide the inside cabinet height into equal clear openings after shelf thickness.

Example numbers are loaded

Replace each example with what you measured. The example result on the right updates as you type.

Measure the cabinetUse clear inside dimensions, not outside case dimensions.
Choose the layoutAn opening is the usable space between shelves.

Measurements stay in this browser and are never sent to analytics.

Example resultLooks good on paper

Each clear opening is about 34 cm

Adjust individual openings for the tallest objects rather than forcing every shelf to match.

Change the sample measurements to turn this into your estimate.
Clear opening
34 cm
Internal shelves
4
Shelf material used
8 cm
Shelf spacing planning diagramA proportional schematic based on the entered values. It is not a construction drawing.
Proportional planning schematic - verify all dimensions on site.

Before you buy or start work

  • Measure the tallest stored object.
  • Confirm shelf-pin increments.
  • Check span and load capacity with the manufacturer.
Method

What this result assumes

The top and bottom of the cabinet are outside the entered usable height.

Movable hardware and shelf sag are not modeled.

Limitations

What it cannot confirm

Heavy loads and long spans require material-specific structural design.

This is a planning estimate, not a building-code, safety, installation, or delivery guarantee.

Confirm product-specific requirements with the manufacturer, installer, retailer, or qualified trade.

Formula 1.0.0Reviewed 2026-07-13General planning assumptions
Read category methodology