Carpet Calculator

Calculate carpet coverage and underlay requirements, including a cutting allowance and optional material costs. Enter measurements for up to five rooms.

Enter your measurements

Dimension unit

Display area in

Number of rooms

Carpet waste (%)

Underlay waste (%)

Room 1

Room name

Length (m)

Width (m)

Deduction area (m²)

Room 2

Room name

Length (m)

Width (m)

Deduction area (m²)

Room 3

Room name

Length (m)

Width (m)

Deduction area (m²)

Room 4

Room name

Length (m)

Width (m)

Deduction area (m²)

Room 5

Room name

Length (m)

Width (m)

Deduction area (m²)

Calculate underlay as well

Optional material prices

Carpet price per m²

Underlay price per m²

Reset

How carpet area is calculated

Gross area: room length × room width.

Net area: gross area − deduction area.

Carpet requirement: net area × (1 + waste percentage ÷ 100).

For a room measuring 5 m × 4 m, the floor area is 20 m². With a 10% carpet allowance, the estimate is 22 m².

Frequently asked questions

How much extra carpet should I allow?

A 5–10% allowance can be a starting point for simple rooms. Patterns, seams and unusual layouts may require more.

Can I calculate multiple rooms?

Yes. Select up to five rooms and enter each room's dimensions.

Is this the exact amount I should order?

No. The estimate uses floor area. Confirm the final quantity with your supplier or installer, especially for patterned carpet or carpet sold in fixed roll widths.