🟫 Carpet Calculator – Free Online DIY Tool

The Carpet Calculator is a simple yet essential tool designed to help you work out exactly how much carpet you need for any room. Whether you're carpeting a bedroom, a living room, or an entire house, this tool takes the guesswork out of your project.

Step 1: Enter the length and width of your room in metres.

Step 2: Select your carpet roll width. Standard carpet rolls are 4 metres wide in the UK.

Step 3: Choose your wastage allowance based on your room shape and cutting requirements.

Step 4: Click "Calculate Carpet" and the tool will tell you exactly how much carpet you need in square metres and the length to order.

Carpet is expensive, and buying the wrong amount can be costly. Buying too much is a waste of money. Buying too little means delays while you wait for more stock — and there's no guarantee the same batch will be available.

This carpet calculator helps you:

• Save money – buy exactly what you need, no more, no less
• Reduce waste – minimise leftover carpet that can't be returned
• Plan your budget – know exactly how much your project will cost
• Avoid delays – buy everything you need in one trip

Whether you're a DIY enthusiast or a professional carpet fitter, this tool is essential for any carpeting project.

Carpet is typically sold by the square metre (m²) and comes in standard roll widths. In the UK, the most common carpet roll width is 4 metres.

When you buy carpet, you pay for the length you need. For example, if your room is 4m x 3m, and you buy a 4m wide roll, you only need 3 metres in length.

This calculator takes into account:

• Room dimensions – length and width
• Roll width – how wide your chosen carpet is
• Wastage allowance – for cuts, fitting, and mistakes

Always add a wastage allowance of at least 10% for irregular room shapes and fitting errors.

Here are some typical carpet quantities for UK rooms:

• Single bedroom (3m x 3m): 9 m² (requires 3m length on a 4m roll)
• Double bedroom (4m x 4m): 16 m² (requires 4m length on a 4m roll)
• Living room (5m x 4m): 20 m² (requires 5m length on a 4m roll)
• Hallway (2m x 5m): 10 m² (requires 5m length on a 2m roll)

These are estimates – always use the carpet calculator for an accurate measurement for your specific room.

If you found this carpet calculator useful, you might also like these related DIY tools:

• Paint Calculator – work out how much paint you need
• Tile Calculator – calculate how many tiles you need
• Flooring Calculator – work out how much laminate or wood flooring you need
• Concrete Calculator – calculate concrete volume for slabs and foundations