Carpet Calculator — m to m², rolls, cost
How to use this calculator
Enter room dimensions in meters or centimeters. Select carpet roll width (3.66 m or 4.57 m standard metric widths). The calculator computes linear meters off the roll, seams, padding, and gripper rod perimeter.
Roll widths — 3.66 m (12 ft equiv.) or 4.57 m (15 ft equiv.).
Underlay — same area as carpet. Gripper rods run the room perimeter minus doorways.
Saved Calculations
| Time | Shape | Area m² | Carpet m² | Roll m | Seams | Cost |
|---|
How to Calculate Carpet (Metric)
This calculator estimates carpet and underlay needed in square meters, linear meters off the roll, seams, and gripper rod length. Enter room dimensions in meters or centimeters, choose roll width (3.66 m or 4.57 m), and set waste allowance.
Formulas
Carpet m² = strips × roll width × room length. Linear meters = strips × room length. Seams = ceil(room width / roll width) − 1. Gripper rods = perimeter minus doorways (~0.9 m per door).
EN Standards
EN 1307 classifies textile floor coverings. EN 14499 covers carpet tiles. Underlay per EN 16354. Always match carpet class to traffic level: class 21-23 domestic, 31-33 commercial.
FAQ
Why wider rolls? 4.57 m rolls cover more rooms seamlessly. Seams are weak points for wear. Pattern matching? Add 10-15% extra for pattern repeats — the repeat distance determines additional waste per seam.
