Paint & Wallpaper
Paint Calculator
Litres of paint for a room — walls, ceiling and woodwork — with coats, coverage and cost.
litres = area × coats ÷ coverage per litre
Also called how much paint do i need · paint quantity calculator
Home & Construction · 10 calculators
Paint & Wallpaper Calculators
How much paint and primer you need for walls, ceilings, doors and fences, paint cost and wallpaper rolls.
Paint & Wallpaper
Wall Paint Calculator
Paint for walls only, from the wall area or room dimensions, with openings deducted.
litres = (wall area − openings) × coats ÷…
Also called paint for walls · emulsion calculator
Paint & Wallpaper
Ceiling Paint Calculator
Paint needed for a ceiling, with an allowance for the extra coat white-over-stain usually needs.
litres = ceiling area × coats ÷ coverage
Also called paint for ceiling · ceiling emulsion
Paint & Wallpaper
Paint Coverage Calculator
How far a tin of paint goes on your surface, with the spreading rate adjusted for texture.
area = litres × rated coverage × surface …
Also called paint spread rate · square meters per litre
Paint & Wallpaper
Paint Cost Calculator
Cost to paint a room including paint, primer, materials and decorator labour.
cost = litres × price + area × labour rat…
Also called cost to paint a room · painting quote calculator
Paint & Wallpaper
Primer Calculator
Primer or sealer needed before painting, adjusted for how porous the surface is.
litres = area × coats ÷ coverage
Also called undercoat calculator · sealer quantity
Paint & Wallpaper
Wallpaper Calculator
Wallpaper rolls for a room, including pattern repeat, drops per roll and paste.
rolls = drops needed ÷ drops per roll
Also called how many rolls of wallpaper · wallpaper rolls calculator
Paint & Wallpaper
Wall Area Calculator
Total wall area of a room or elevation with doors and windows deducted.
net area = perimeter × height − openings
Also called wall square footage · surface area of walls
Paint & Wallpaper
Door Paint Calculator
Paint needed for doors and frames, counting both faces, edges and the architrave.
area = (door faces + frame) × doors, litr…
Also called paint for doors · door and frame paint
Paint & Wallpaper
Fence Paint Calculator
Fence paint or stain needed, counting both sides, posts and the rough-timber soak-in.
litres = total area × coats ÷ coverage fo…
Also called fence stain calculator · how much fence paint
Key paint & wallpaper formulas
| Paint | litres = area × coats ÷ coverage per litre |
|---|---|
| Wall Paint | litres = (wall area − openings) × coats ÷ coverage |
| Ceiling Paint | litres = ceiling area × coats ÷ coverage |
| Paint Coverage | area = litres × rated coverage × surface factor ÷ coats |
| Paint Cost | cost = litres × price + area × labour rate + sundries |
| Primer | litres = area × coats ÷ coverage |
| Wallpaper | rolls = drops needed ÷ drops per roll |
| Wall Area | net area = perimeter × height − openings |
| Door Paint | area = (door faces + frame) × doors, litres = area × coats ÷ coverage |
| Fence Paint | litres = total area × coats ÷ coverage for that timber |
Paint & Wallpaper questions
How much wall does a litre of paint cover?
Typically 10–12 m² per litre per coat on a smooth sealed surface. Rough or porous walls can halve that.