How to measure for shelves - Artisaw

How to Measure for Shelves Cut to Size

Getting your shelf measurements right is easy — and ensures your new shelves fit perfectly the first time.

This guide explains exactly how to measure for custom cut shelves, whether you're fitting:

  • alcove shelves
  • bookcase shelves
  • floating shelves
  • wardrobe shelves
  • wall-mounted shelves

All we need are three numbers:

Length × Depth × Thickness

Measuring for custom shelves

Getting Perfect Measurements for Your Custom Shelves

Accurate measurements are essential for custom-cut shelves that fit perfectly first time. Follow this simple guide to measure your alcove or wall space correctly and avoid costly mistakes.

What You'll Need

  • Steel tape measure (at least 3 metres)
  • Pencil and paper for recording measurements
  • Spirit level (optional but recommended)
  • Helper (useful for larger alcoves)
Measuring shelf depth accurately

Step 1: Measure the shelf length

Measure the left-to-right opening where the shelf will sit

Take measurements at:

  • the front
  • the middle
  • the back

Walls are rarely perfectly square.

👉 Use the smallest measurement to ensure the shelf fits easily.

Example:

Front = 1012mm

Middle = 1008mm

Back = 1005mm

Shelf length to order = 1005mm

Step 2: Measure the shelf depth

Depth is the front-to-back measurement.

Measure from the wall to the front edge

Decide if you want:

  • flush to wall
  • or a small front overhang

👉 Typical shelf depths:

Book shelves: 180–250mm

Wardrobe shelves: 400–600mm

Alcove shelves: varies by space

Perfectly fitted custom shelves

Step 3: Choose shelf thickness

Thickness affects:

  • strength
  • resistance to sagging
  • visual style

Typical recommendations:

18mm — light duty shelves

25mm — general purpose shelves

30–40mm — long spans or heavy loads

Example measurement

Alcove shelf:

Length: 1005mm

Depth: 220mm

Thickness: 25mm

This is exactly what you enter in the Artisaw size calculator.

💡 Pro Measuring Tips

  • Always measure twice, cut once
  • Use the smallest width measurement if your alcove tapers
  • Deduct 3-5mm from depth for fitting tolerance
  • Take photos of your space and send them with your order
  • If in doubt, contact us – we're happy to help

Ready to order?

Once you have your measurements:

👉 Order shelves cut to size

Common Measuring Mistakes to Avoid

❌ Using only one width measurement – Always measure at multiple points

❌ Forgetting about skirting boards – These reduce your usable depth

❌ Measuring in inches then converting – Measure in millimetres from the start

❌ Not allowing fitting tolerance – Shelves cut to exact measurements won't fit

Need Help with Measurements?

Our team is here to help ensure you get perfect measurements. Send us photos of your space and we'll guide you through the process.

Contact Us

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