Online Tools & Utilities · United States
Free paint coverage calculator for interior and exterior painting projects
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A free online paint coverage calculator that estimates how many gallons or liters of paint you need for interior or exterior walls by entering room dimensions.
Kōōihaus™ offers a free paint coverage calculator tool that helps homeowners and painters estimate exactly how much paint they need for interior or exterior projects. Users enter their room or wall dimensions, specify the number of coats, and account for doors and windows. The calculator automatically adjusts for real-world details and provides instant estimates in gallons or liters. The tool works for both interior and exterior painting, includes options for primer calculation, and handles metric and imperial units. No signup is required and results are provided instantly.
Pricing model: Free
Most standard rooms require roughly 7–12 liters (approximately 2–3 gallons) for two coats, depending on wall size and surface condition. A paint coverage calculator provides a precise estimate based on your specific room dimensions.
A 12×12 ft room (approximately 3.6 × 3.6 m) typically needs around 4–10 liters (1–2.5 gallons) of paint, depending on the number of coats and wall texture. Two coats are standard for a professional finish.
On average, one gallon of paint covers approximately 350–400 square feet (about 8–10 m² per liter) on smooth, previously painted surfaces.
Subtract approximately 20 square feet (≈2 m²) per door and 15 square feet (≈1.5 m²) per window from your total wall area, or use a paint coverage calculator to handle this automatically.
Most standard rooms require roughly 7–12 liters (approximately 2–3 gallons) for two coats, depending on wall size and surface condition. Use a paint coverage calculator for a precise estimate based on your room dimensions.
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