This carpet calculator works out how much carpet, underlay and gripper rod you need for any room. Enter the room length and width, add a waste allowance and get the carpet area plus underlay and gripper quantities in a moment.
This carpet calculator takes your room length and width, adds a waste allowance, then works out the carpet area you need along with the underlay and gripper rod. Because carpet comes off a fixed-width roll, it also flags where you are likely to need a seam so you can plan the layout before you order.
| Roll width | Best for |
|---|---|
| 4 m | Most rooms up to 4 m wide with no seam |
| 5 m | Wider rooms and lounges |
| 3.66 m (12 ft) | Older stock and some budget ranges |
A bedroom 3.5 m long and 3 m wide is 10.5 m². Add 10% for trimming and it comes to about 11.6 m². From a 4 m wide roll you would order a 4 m × 3.5 m piece (14 m²) so it fits with no seam — the extra covers doorways and squaring up. This carpet calculator does that sum and tells you the underlay and gripper too.
Comparing floor finishes? Try the flooring calculator for laminate and wood, the tile calculator for hard floors, and the screed calculator for levelling a subfloor first.
Enter your room length and width and a waste allowance, and the carpet calculator returns the carpet area you need plus the underlay rolls and gripper rods. It also flags whether a seam is likely from a standard roll width.
Multiply room length by width and add about 10% for waste. Carpet is cut from a fixed-width roll, so the room shape affects how much you actually buy.
Yes – underlay extends carpet life, improves comfort underfoot and adds sound and heat insulation.
Gripper rods (tack strips) are thin timber strips with angled pins that hold the stretched carpet in place around the edges of the room.
Carpet is usually sold by the linear metre off a fixed-width roll (commonly 4 m or 5 m), so room shape affects waste. This carpet calculator factors in the roll width for you.
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