Carpet Cost Calculator

What the Carpet Cost Calculator Does

This Carpet Cost Calculator estimates how much you'll spend on carpet based on the floor area you need to cover and the price per square metre of the carpet you choose. Enter the area in square metres and the price per m², and it returns a total cost figure you can use for budgeting and comparing quotes.

It's built for homeowners planning a renovation, renters wanting a quick budget, landlords pricing a re-carpet, and tradespeople preparing customer estimates. Anyone who needs a fast carpet cost figure without doing the maths by hand will find it useful.

How the Carpet Cost Is Calculated

The core calculation is simple multiplication of area by unit price:

cost = area (m²) × price per m²

Because carpet is cut from rolls and rooms are rarely a tidy rectangle, you should also add a wastage allowance for offcuts, pattern matching, and trimming. The calculator applies this as a percentage on top of the area:

total cost = area (m²) × (1 + wastage %) × price per m²

A wastage allowance of 5-10% is common for plain carpet in a square room, while patterned carpet, stairs, or awkward layouts can push it to 15% or more.

Worked Example

Suppose you're carpeting a living room that measures 5 m by 4 m, giving an area of 20 m². You've chosen a carpet priced at 18 per m², and you allow 10% wastage.

First, apply wastage to the area: 20 m² × 1.10 = 22 m². Then multiply by the price: 22 m² × 18 = 396. So your estimated carpet cost is 396.

Without the wastage allowance, the bare figure would be 20 × 18 = 360 — but ordering exactly 20 m² rarely works once offcuts and trimming are factored in, which is why the 36 buffer matters.

Factors That Affect the Total

The headline price per m² is only part of the picture. Several other variables change what you actually pay:

• Underlay: usually sold separately and priced per m², often 4-10 per m².
• Fitting and labour: charged per m² or as a day rate, and not always included in the carpet price.
• Gripper rods, door bars, and adhesive: small extras that add up across multiple rooms.
• Roll width: standard rolls are typically 4 m or 5 m wide, so a room dimension that doesn't divide neatly into the roll width increases wastage.
• Delivery, uplift of old carpet, and disposal fees.

Tips and Common Mistakes

Measure each room at its widest points and into doorways or alcoves, not just the open floor — carpet is cut to the largest dimension. For non-rectangular rooms, split the space into rectangles, calculate each area, and add them together.

The most frequent mistake is ordering the exact floor area with no wastage, which leaves you short. The opposite error is over-buying with a wastage figure that's too high for a simple room. Match your allowance to the job: lower for plain carpet in a square room, higher for stairs, patterns, or irregular shapes.

Finally, remember this is a material estimate. Confirm whether your quote includes underlay and fitting before comparing prices, and always get a professional measure for the final order.