Wall Paint Area Calculator

Check out Wall Paint Calculators that compute wall area based on five everyday shapes.

This wall paint area calculator estimates the paintable surface area for common wall types such as single walls, walls with openings, accent walls, sloped walls, and L-shaped rooms. Formulas are provided below.

Single Wall
The paintable area of a flat wall is A = length × height, where length is the horizontal run and height is from floor to ceiling. For a wall 15 ft wide and 9 ft high, the calculator gives A = 15 × 9 = 135 ft².

Wall with Openings
To adjust for windows or doors, subtract their area from the total: A = (wall length × wall height) – (window area + door area). For a 12 × 9 ft wall with a 3 × 4 ft window and 3 × 7 ft door, A = 108 – (12 + 21) = 75 ft² using the calculator.

Accent Wall
An accent wall’s area is calculated the same as a regular wall: A = width × height. This is useful for estimating unique finishes or textures. For a 10 ft wide wall with 8 ft height, the calculator gives A = 10 × 8 = 80 ft².

Sloped Wall
The area of a sloped wall is A = ½ × base × height, treating it like a triangle. For a wall 14 ft long and 6 ft tall at its peak, the paint calculator returns A = ½ × 14 × 6 = 42 ft².

L-Shaped Room
For L-shaped rooms, divide the wall layout into sections and sum the areas using A = A₁ + A₂ + A₃… as needed. For three walls: 10 × 9, 8 × 9, and 12 × 9 ft, total paintable area is A = 90 + 72 + 108 = 270 ft².

Paint ordering advice: Start by calculating each wall face individually. A 12 × 9 ft wall yields 108 square feet, but don’t forget to subtract for windows. For round cutouts or archways, reference the area calculator — it handles circles, ellipses, and other shapes most paint tools miss.

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