Paint Coverage Calculator
Find out exactly how much paint your rooms need — add wall sizes, doors, windows and coats, and get the liters needed plus the smartest tin sizes to buy.
For each room enter the total wall length to paint (sq ft) and the wall height (ft).
Each door = 21 sq ft (auto subtracted)
Each window = 15 sq ft (auto subtracted)
Check the tin label — most wall paints cover 100–140 sq ft per liter
Paintable Area
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Paint Needed
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Buy This Combo
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How to use
- Choose Measure Rooms or Total Wall Area.
- If measuring rooms, add one row per room: total wall length (sq ft) x wall height (ft). You can add up to 6 rooms.
- Enter how many doors and windows will not be painted — their area is subtracted automatically.
- Pick the number of coats (1–3) and the paint coverage from the tin label (default 120 sq ft per liter).
- The paintable area, liters needed and the best 1L / 4L / 20L tin combo update instantly.
Tips
- Buy the recommended tin combo — it is chosen to leave the least leftover paint.
- Always get 10% extra paint for touch-ups; one small tin extra is usually enough.
- Rough or textured walls drink more paint — lower the coverage value to 90–100 sq ft per liter.
- Two thin coats last longer and look better than one thick coat.
- Keep leftover paint sealed and labelled — it is perfect for future touch-ups.