Paint Calculator
Estimate paint quantity in Liters and Gallons for walls and ceilings with opening deductions, can size packaging, and cost calculator.
1. Room Dimensions & Ceiling
2. Deductions (Doors & Windows)
3. Paint Type & Coats
Hardware Store Can Purchase Breakdown
Optimized bucket packaging to minimize leftover paint:Paint Estimation Tips
- • Standard Room Rule: A 12×14 ft bedroom with 10 ft ceiling typically takes ~7–8 Liters for 2 coats.
- • Ceiling Paint: Flat or matte white ceiling paint reflects light and hides drywall imperfections.
- • Buying in Bulk: 20 Liter buckets cost 20–30% less per liter than buying multiple 1 Liter cans.
How to Use Paint Calculator
- Enter room dimensions (Length, Width, and Ceiling Height in feet or meters).
- Select whether you want to paint the ceiling as well.
- Enter the number of doors and windows to automatically deduct non-paintable areas.
- Select your paint type (Interior Emulsion, Exterior Weatherproof, Luxury Silk, Primer) and number of coats (1, 2, or 3).
- View the total paint required in Liters / Gallons, plus the recommended can container purchasing breakdown (20L, 10L, 4L, 1L).
Key Features & Privacy Guarantee
- Wall & Ceiling Separate Estimation: Independently calculate wall surface area and ceiling area.
- Smart Cutout Deductions: Pre-configured door (21 sq ft) and window (15 sq ft) subtractions with custom sizing options.
- Paint Type & Coverage Presets: Interior Emulsion (130 sq ft/L), Exterior Acrylic (90 sq ft/L), Luxury Silk (160 sq ft/L), and Drywall Primer.
- Can Packaging Optimizer: Computes the exact combination of 20L, 10L, 4L, and 1L (or 5-gal & 1-gal) buckets to buy at the hardware store.
- Cost & Budget Estimator: Calculates total project paint cost with custom price per liter.
Frequently Asked Questions
How many square feet does 1 Liter of paint cover?
On smooth, primed interior walls, 1 Liter of standard emulsion covers approximately 120 to 140 square feet per coat (approx 350-400 sq ft per US Gallon). Textured or unprimed walls cover approximately 80 to 100 sq ft per Liter.
How many coats of paint do I need?
Two coats are recommended for optimal color depth, durability, and streak-free finish. If painting over a very dark wall with a lighter shade, apply 1 coat of primer plus 2 to 3 finish coats.
How do you calculate wall surface area for painting?
Calculate the room perimeter: Perimeter = 2 × (Length + Width). Multiply by wall height: Gross Wall Area = Perimeter × Height. Finally, subtract total door and window areas: Net Area = Gross Area - Openings.
How much paint is in 1 US Gallon compared to Liters?
1 US Gallon is equal to approximately 3.785 Liters. 1 Imperial Gallon is equal to 4.546 Liters.