Paint Calculator (How Much Paint Do I Need?)
Calculator ToolsCalculate litres of paint for walls and ceiling
FreePrivateInstant
Units
Room length
Room width
Wall height
Number of doors
Number of windows
Paint the ceiling too?
Coats
Coverage of your paint (sq ft per litre, one coat)
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History
All history →Paint Calculator (How Much Paint Do I Need?) — at a glance
Buy the right amount of paint — not too little, not too much.
14 × 12 ft, height 10 ft
2 coats
Calculate
8.2 litres
Buy 9 litres
How to use it — step by step
Room length, width and height, plus doors, windows and coats.
1
Choose units
Feet or metres.
2
Enter the room size
Length, width, height.
3
Add doors, windows, coats
These are subtracted from the wall area.
4
Read the amount
Litres needed and what to buy.
Pro tips
Small things that make the result better.
✦Check the coverage on the tin and change it if different.
✦Dark colours may need an extra coat.
✦Use primer on new walls.
Quick facts
Feet / mboth
+10%extra suggested
Ceilingoptional
Freeno signup
Frequently Asked Questions
What is paint coverage?+
How much area one litre covers in one coat. It is printed on the tin, usually 90–120 sq ft per litre.
Are doors and windows included?+
They are subtracted using standard sizes.
Should I buy extra?+
Yes, about 10% for touch-ups and uneven walls.
Is my data safe?+
Yes. Everything runs inside your own browser. Your text, files and images are never uploaded to any server.
Is this tool really free?+
Yes — completely free, no signup, no watermark and no usage limit.
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