Paint Calculator
Find out how many litres of paint you need to cover any room or surface.
Room Dimensions
2 coats recommended for best coverage
Typical: 350 sq ft/gal (smooth), 250 sq ft/gal (textured)
Paint Required
5
gallons to buy
(4.91 exact)
📐 Room Breakdown
🎨 Paint Types & Coverage
💡 Painting Tips
- • Always buy extra (10-15%) for touch-ups
- • Dark colors require more coats
- • Textured surfaces need more paint
- • Primer counts as one coat
- • Calculate ceiling separately if different color
- • Temperature affects drying time
🏠 Common Room Sizes
Formula
Wall Area = 2 × (Length + Width) × Height
Total Area = Wall Area + Ceiling Area
Paint Needed = (Total Area × Coats) ÷ Coverage per Gallon
How it works
Wall Area = 2 × (Length + Width) × Height Ceiling Area = Length × Width Total Area = Wall Area + Ceiling Area Paint Needed = (Total Area × Number of Coats) ÷ Coverage per Gallon Example: Room: 20ft × 15ft × 8ft, 2 coats, 350 sq ft/gallon Perimeter = 2 × (20 + 15) = 70 ft Wall Area = 70 × 8 = 560 sq ft Ceiling = 20 × 15 = 300 sq ft Total = 860 sq ft Paint = (860 × 2) ÷ 350 = 4.9 gallons (buy 5)
The paint calculator determines how much paint you need for your room. Enter room dimensions, number of coats, and paint coverage to get an accurate estimate. Includes common room sizes, paint type coverage, and helpful painting tips.
Why this matters
Buying the right amount of paint saves money and eliminates extra trips to the store. Too little paint means incomplete coverage; too much means wasted money. Account for paint type, color darkness, and surface texture when estimating.
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Learn more
The complete guide to paint calculator
Formulas, examples, and tips explained in plain English