Room, paint & tile calculator – the whole house in a minute
Add each room's length, width and height. Get floor and wall area, paint litres, tiles with wastage, false-ceiling area and skirting – in feet or metres.
Rooms
Your estimate · 1 room
Floor area
192 sq ft
Wall area (less doors & windows)
515 sq ft
Ceiling / false ceiling
192 sq ft
Skirting length
53 running ft
Paint (walls + ceiling)
≈ 12 litres
Floor tiles (+10% wastage)
≈ 53 tiles
Assumes door 3×7 ft, window 4×3 ft and ~120 sq ft per litre per coat. Use as a planning estimate; confirm with your contractor.
Show the client the room before it's built.
Our Architect & Interior 3D Studio lets you draw rooms to size, place furniture and fixtures, change finishes live and share the design – one-time cost, your logo, lifetime access.
How to use it
- 1Choose feet or metres.
- 2Add each room with its length, width, height and number of doors and windows.
- 3Pick your tile size and number of paint coats.
- 4Read the totals – use them for your quotation or material order.
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FAQ
Room & Interior Calculator: questions
Roughly 1 litre covers about 120 sq ft for one coat of emulsion. A 16 × 12 ft room with 10 ft walls, one door and two windows needs about 12 litres for two coats of walls and ceiling. The calculator works it out for every room.
Floor area ÷ area of one tile, plus about 10% for cutting and breakage. For 2 × 2 ft tiles, a 192 sq ft room needs about 53 tiles.
Yes – a standard door (3 × 7 ft) and window (4 × 3 ft) are subtracted for every opening you enter.
Not in this free calculator. Our Architect & Interior 3D Studio lets you draw rooms to size, place furniture, change finishes live and share a proposal.
Win more interior projects with a 3D walkthrough.
Architect & Interior 3D Studio – your logo, one-time cost, lifetime access.
