Room area & materials calculator

Free · no sign-up · runs in your browser, nothing uploaded

Enter each room’s length, width and height with the number of doors and windows. You get floor, wall and ceiling areas and a materials list for the whole job.

1Add your rooms
2Choose the options
3Get areas and a materials list
Options

Totals across rooms

Materials

Door 0.9 × 2.0 m and window 1.2 × 1.0 m deducted from walls. Paint: 2 coats at 12 m² per litre. Skirting: perimeter less door widths, in 4.2 m lengths.

Questions

How are doors and windows taken off?

Each door takes off 0.9 × 2.0 m and each window 1.2 × 1.0 m from the wall area. Door widths are also taken off the skirting run.

How much extra should I allow?

The 10% option covers cuts and waste for most jobs. Allow more for diagonal tiling or rooms with lots of corners.

How is paint worked out?

Two coats at about 12 m² per litre. Check the tin, as coverage varies by brand and surface.

What size plasterboard does it use?

Standard 2.4 × 1.2 m sheets, which cover 2.88 m² each.