buncha/finance/paint-calculator

Paint Coverage Calculator

Drop in your room dimensions, count the doors and windows, choose a paint type and coat count. Get back the litres you actually need and how many 5-litre and 2.5-litre tins that translates to in the shop. Plan a whole flat at once with the room tabs; copy the whole shopping list to clipboard when you're done.

Everything is computed locally. Nothing is uploaded.

Room size

Length (m)

Width (m)

Ceiling height (m)

Openings (subtract from walls)

Doors

Door area each (m²)

Standard interior door ~ 1.96 m²

Windows

Window area each (m²)

Standard sash window ~ 1.4 m²

Paint

Coats

Spreading rate (m²/L)

Waste buffer (%)

Extra paint for cutting in / spillage. 10% is a sensible default.

Paint the ceiling too

6.51 L for Living room

1 × 5 L + 1 × 2.5 L at the shop

Wall area (net of openings)

35.52 m²

38.88 m² gross − 3.36 m² openings

Wall paint (2 coats)

6.51 L

71.04 m² of surface @ 12 m²/L

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About Paint Coverage Calculator

Work out how much paint you need before you go to the shop. Room dimensions + doors + windows + coats give you litres needed and how many 5 L / 2.5 L tins to grab. Multi-room support for whole-flat planning, with a one-click shopping-list copy at the end.

Everything happens on your device. Close the tab and it's gone.