How Much Flooring Do I Need? Measurement Guide

📖 8 min read

The maths is simple: length × width = square metres. But if you order exactly that amount, you'll run short. Every time.

Flooring needs wastage allowance – for cuts at walls, mistakes, damaged pieces, and pattern matching. The tricky part isn't measuring your room; it's knowing how much extra to add and how to handle rooms that aren't perfect rectangles.

This guide walks you through everything. Or if you just want the answer fast, use our free flooring calculator – it handles all the maths including wastage.

Basic Room Measurement

For a rectangular room:

How to measure accurately

1. Measure at floor level – walls aren't always straight, and the floor dimension is what matters
2. Measure the longest points – measure wall to wall at the widest part of the room
3. Include alcoves and recesses – measure into wardrobes, bay windows, and any nooks the flooring will cover
4. Measure twice – seriously, just double-check

Example: A room measuring 5.2m long × 4.1m wide = 21.32m²

Don't subtract for furniture

Measure the full room, wall to wall. Don't deduct space for kitchen islands, built-in wardrobes, or anything else. The flooring usually needs to run underneath or right up to these features, and you need material for the cuts.

Measuring Irregular Rooms

Most rooms aren't perfect rectangles. Here's how to handle common situations:

L-Shaped Rooms

Break the room into two rectangles. Measure each one separately, then add them together.

┌─────────────┐
│             │
│   Area A    │ 4m × 3m = 12m²
│   (4m×3m)   │
│             │
├─────┬───────┘
│     │
│  B  │ 2m × 3m = 6m²
│     │
└─────┘
         Total = 18m²
        

Rooms with Bay Windows or Alcoves

Measure the main rectangle, then add the bay window or alcove as a separate shape.

Open Plan Living/Kitchen/Dining

Measure the whole space as one area. It's usually easier to measure the overall rectangle and subtract any sections that won't have flooring (like a tiled kitchen if you're only doing the living area).

Angled Walls

For rooms with angled or curved walls, measure as if the room were a rectangle that contains the whole space. The extra in the corners becomes part of your wastage – you'll need it anyway for the diagonal cuts.

How Much Wastage to Add

This is where most people go wrong. You need more flooring than your room's square meterage.

Wastage covers:

• Cuts at walls and doorways (the offcuts are often too small to use)
• Pattern staggering (you can't start every row with a full plank)
• Damaged pieces in the box (rare with quality flooring, but happens)
• Mistakes during installation
• Future repairs (good to keep a few spare planks)

Wastage by flooring pattern:

Standard Plank

Add 10%

Standard plank flooring in rectangular rooms

Easiest

Herringbone

Add 15%

Herringbone patterns require more cuts at walls

Moderate

Chevron

Add 15-20%

Chevron patterns have angled ends requiring precise cuts

More Waste

When to add more

Bump up your wastage allowance if:

• Room has lots of angles or alcoves – more cuts = more waste
• You're a first-time installer – allow for the learning curve
• Room is very small – proportionally more cuts relative to floor area
• You want spare planks for repairs – good idea for high-traffic areas

Measuring Multiple Rooms

If you're doing several rooms with the same flooring, you can calculate two ways:

Option A: Measure each room, add wastage to each, then total

More accurate for rooms with different shapes and complexity levels.

Option B: Total all rooms, then add wastage once

Simpler, and often gives a slightly lower number (offcuts from one room can sometimes be used in another).

For most projects, both methods give similar results. Our flooring calculator handles multiple rooms and lets you specify different wastage factors for each if needed.

Full Example Calculation

Let's walk through a real scenario:

Converting to Boxes

Flooring is sold by the box, and each box covers a specific area. You'll need to convert your square metre calculation to boxes. 

But don't worry, as our flooring calculator on our product pages calculates this for you. All you need to do is enter the area. 

Our hybrid flooring typically comes in boxes covering:

• 6.5mm SPC Hybrid: ~2.3m² per box
• 9.5mm SPC Hybrid: ~2.2m² per box
• Herringbone: ~1.3-1.5m² per box

Check the specific product page for exact coverage – it varies by plank size.

The calculation

Using our example: 97m² ÷ 2.2m² per box = 44.09 → Order 45 boxes

What About Accessories?

Don't forget to measure for accessories too:

• Scotia: Measure the total linear metres of skirting board around all rooms (add 10% for mitred corners and waste)
• Transition strips: Count how many doorways need a T-moulding or reducer
• Stair nosing: Count the number of stairs and measure each tread width

Our flooring calculator includes fields for accessories so you can get everything in one order.

Common Measurement Mistakes

Let the Calculator Do the Work

Honestly? The easiest approach is to use our flooring calculator. Enter your room dimensions, select your flooring type, and it handles wastage, boxes, and even accessories automatically.

If you have a floor plan from your builder or architect, you can usually pull the room dimensions directly from that.

Need Help With Your Project?

Not sure about your measurements, or have a tricky room layout? Send us your floor plan or room dimensions and we'll help you work out exactly what you need. Call 0431 311 633 or send us a message.

You can also order free samples to check colours in your space before committing to a full order.

Last updated: December 2025 · Written by the team at Hybrid Floors Australia

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