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Calculate how much paint you need for a room by entering length, width, and height. Wall area is auto-computed — no door or window counting needed for quick estimates.
Part of the Surfaces & Finishes calculators — see all tools in this category.
This calculator provides a quick paint estimate for room walls by computing the wall area automatically from your room dimensions.
Formula: Wall Area = 2 × (Length + Width) × Height. Paint = (Wall Area × Coats) ÷ Coverage Rate × (1 + Waste %)
Note: This quick mode excludes ceiling, doors, and windows. For a full calculation with all surfaces and opening deductions, use the Paint Coverage Calculator.
Paint Coverage Calculator
Calculate how many liters of paint you need for walls, ceilings, and trim using room dimensions, coat count, and standard coverage rates.
Exterior Paint Calculator
Estimate exterior paint quantity with a surface type selector for brick, wood, stucco, and render. Coverage rates adjusted per surface with L/gal toggle.
Paint Cost Calculator
Estimate total paint cost from quantity and price per liter or gallon. Includes coats, waste factor, and an itemized cost breakdown table.
Tile Calculator
Work out how many tiles to order for floors and walls, with waste factors adjusted for grid, diagonal, and herringbone patterns.
Room length in millimeters
Room width in millimeters
Room height in millimeters
Wall area = 2 × (length + width) × height. Ceiling excluded — use Paint Coverage Calculator for full calculation including ceiling, doors, and windows.
1–4 coats (2 is typical)
Typical waste is 10% for painting
Interior Standard Latex, 2 coats
Walls only (no ceiling)
Interior Standard Latex