Paint Calculator
Calculate how many gallons of paint you need for a room. Input dimensions, subtract doors and windows, and choose number of coats. Supports imperial and metric units.
1.4Kuses
8.4/10(469)
Standard Sizes Used
- Standard door: 3 ft x 7 ft = 21 sq ft
- Standard window: 3 ft x 5 ft = 15 sq ft
- Paint coverage: ~350 sq ft per gallon per coat
How to Use the Paint Calculator
- Select your preferred unit system: Imperial (feet) or Metric (meters).
- Enter the room length, width, and ceiling height.
- Enter the number of standard doors and windows to subtract.
- Choose 1 or 2 coats of paint.
- Click Calculate to see the gallons needed.
Paint Coverage
On average, one gallon of paint covers approximately 350 square feet per coat on smooth, primed surfaces. Rough or porous surfaces may require more paint. Most rooms benefit from two coats for even color coverage.
Features
- Imperial and metric unit support
- Door and window area subtraction
- Single or double coat estimation
- Results in gallons and liters
- One-click copy result to clipboard
- 100% client-side processing for full privacy
Recommended Products
Ad📏Tape MeasuresShop →🔧Level ToolsShop →🧰Tool SetsShop →🔩Drill SetsShop →📡Stud FindersShop →💻Laptop StandsShop →🖱️Wireless MouseShop →🔌USB-C HubShop →👓Blue Light GlassesShop →🖥️Desk PadShop →
Affiliate Disclosure: As an Amazon Associate, ToolBird earns from qualifying purchases. Links above are affiliate links — if you buy through them, we may earn a small commission at no extra cost to you.
Disclaimer: This tool is provided as-is for informational and educational purposes only.