Flooring Calculator

Work out floor area, planks, boxes and underlay rolls from room dimensions in metres or feet.

Flooring calculator

Room length Room width

Plank length (mm) Plank width (mm)

Planks per box Waste (percent)

Underlay roll size (square metres)

Floor area: — · In square feet: —

Planks needed: — · With waste: —

Boxes needed: —

Underlay: —

—

Underlay is estimated with a 5 percent overlap allowance on top of the floor area.

Common questions about the free online flooring calculator.

Multiply the room length by the width to get the area, then divide by the coverage of one plank and add your waste allowance.

Set the unit to feet and enter the length and width. The tool converts the area to square metres and shows both figures.

Ten percent is usual for a straight lay, and 15 percent or more for a diagonal pattern, a small room or many doorways.

Planks are the individual boards, while boxes hold a set number of planks, so the tool rounds your plank count up to whole boxes.

Underlay adds comfort and sound insulation, and most laminate and engineered floors need it unless the boards already have a backing.

Buy enough for the floor area plus a five percent overlap at the joins, which is the allowance this calculator uses.

Wood and laminate should sit in the room for about 48 hours before fitting so it settles to the room temperature and humidity.

No. It covers the floor area, planks, boxes and underlay, so add skirting, beading and door bars separately.

No. The flooring estimate runs in your browser and nothing you type is sent to a server.

Yes. It is completely free, needs no account and you can measure as many rooms as you like.

Last updated: October 10, 2026