How to Measure a Room for Flooring

Start with a room sketch and measurements in metres. The quantity to order depends on whether you are buying packs of planks or tiles, carpet from a roll, or sheet vinyl. Floor area is a useful starting point, not always the purchase quantity.

Measure the whole space

Mark doors, alcoves, bays, fixed units and any changes in shape. Measure the full dimensions at more than one point; do not assume opposite walls are identical. For an irregular room, split the floor into rectangles that do not overlap and add their areas. Record the maximum dimensions as well, because a roll cutting plan needs them.

Calculate square metres

Multiply length by width for each rectangle. A 4.2 m by 3.5 m rectangle is 14.7 m². Add separate areas once, without counting overlapping sections twice. Keep your sketch so the supplier or fitter can check how the measurements fit together.

Planks and tiles: allowance, then whole packs

Agree a cutting allowance for the exact product, laying pattern and room shape. There is no single percentage that guarantees enough material for every job. Add the agreed allowance, divide by the exact pack coverage and round up to whole packs. For example, 14.7 m² with an illustrative 10% allowance is 16.17 m²; at 2.2 m² per pack that requires eight packs, supplying 17.6 m². That percentage is an example, not a specification for your floor.

Carpet and sheet vinyl: plan the roll widths

Confirm the available roll widths and the lengths required for each piece. Allow for trimming, pile or design direction, pattern repeats and agreed joins. Do not convert an area total into a roll order without a cutting plan: an offcut may not fit the next room or run in the right direction. Have stairs, winders and complex layouts measured by an experienced fitter.

Check before ordering

Confirm the quantity, format, pack coverage or roll width, batch requirements and any spare material you wish to keep. Buying everything together can help with batch consistency, but it does not guarantee every piece looks identical. Compare a flooring sample at home and send us your sketch and product reference for help. For pack-based estimates, use the flooring calculator; for the next stage, see our installation guides.