About the Carpet Calculator
Carpet, underlay and gripper rod for a room, allowing for roll width and pattern match.
Also known as: how much carpet do i need, carpet square meters, carpet roll calculator, carpet yards.
How to use this calculator
- Enter room length, room width, roll width, pattern repeat allowance and the other fields.
- The result updates instantly as you type — press Calculate (or Enter) at any time.
- Review the breakdown shown under the main result.
- Use Copy result or Share to save the answer or send a link with your inputs.
Formula
linear metres = ceil(room width ÷ roll width) × room length
Worked example
Using the values pre-filled in the calculator above:
- Room length = 5 m
- Room width = 4 m
- Roll width: 4 m
- Pattern repeat allowance = 0 %
- Price per m² = 25
- Underlay per m² = 6
the calculator returns:
- Carpet to order: 5 linear m
- Area purchased: 20 m²
- Room area: 20 m²
- Waste: 0 m²