Carpet Rolls Calculator
Work out the linear metres of carpet roll a room needs, with a waste allowance.
Quick answer: enter your details below and click Calculate Carpet Length — your result appears instantly, right here in your browser. Nothing you enter is uploaded or stored.
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Enter your details below.
How to use
- Measure the room area in square metres.
- Enter the carpet roll width in metres.
- Click Calculate Carpet Length.
About this tool
Carpet comes off a roll of fixed width, so the tool divides room area by roll width to get linear metres, then adds a 10 percent allowance for cuts and joins. Enter area and roll width and the length appears at once.
Frequently asked questions
What about doorways and joins?
Joins and doorway cuts are exactly what the waste allowance is for; complex rooms may need more.
Should I round up?
Yes, carpet is sold in whole lengths, so round the allowed length up to the next whole metre.