Wall Paint Calculator

Work out exactly how much paint you need — walls, doors, windows and coats all accounted for.

How to Use This Calculator

Add each wall — enter the length and height in centimetres for every wall you're painting. Include the ceiling too, if needed.
Add doors and windows — these are deducted automatically from your total paintable area.
Choose your paint type — coverage rates vary, so pick the closest match or set a custom rate.
Set coats and tin size — 2 coats is recommended for most jobs.
Read your results — total litres needed and tins to buy update instantly on the right.

Include ceiling (uses Wall 1 × Wall 2 length as room footprint)

Custom Coverage (m² per litre)

Number of Coats

Tin Size to Buy (litres)

Updates instantly as you adjust settings.

Add at least one wall with valid dimensions to see your results.

Tins to Buy

– tins

Paint Needed

– L

Net Paintable Area

– m²

💡 Area shown is after deducting doors and windows, multiplied by your chosen number of coats.

Use your calculated paint amount when placing your order. Save or share your results below.