Calculate the square footage of a wall from its length and height, or of all four walls in a room, minus doors and windows, in ft² or m².

Openings and material estimates
Blank means no deduction; measure the openings you will actually exclude.

Typical interior paint covers 350–400 ft² per gallon (8.6–9.8 m²/L). Use your product label; blank omits paint.

Blank omits the piece estimate. Area alone does not model cut layout or pattern repeats.

Optional, in your chosen currency. Cost uses the exact paint quantity, before package rounding.

Wall Area Formula

The following two example problems outline the steps and information needed to calculate the Wall Area.

WA = WL × WH
  • Where WA is the Wall Area (ft2)
  • WL is the wall length (ft) 
  • WH is the wall height (ft) 

To calculate the wall area, multiply the wall length by the wall height.

How to Calculate Wall Area?

The following example problems outline how to calculate Wall Area.

Example Problem #1:

  1. First, determine the wall length (ft).
    • The wall length (ft) is given as 10.
  2. Next, determine the wall height (ft).
    • The wall height (ft) is provided as 8.
  3. Finally, calculate the Wall Area using the equation above: 

WA = WL * WH

The values provided above are inserted into the equation below and computed.

WA = 10 * 8 = 80.00 (ft2)

Example Problem #2: 

For this problem, the variables required are provided below:

wall length (ft) = 12

wall height (ft) = 10

Test your knowledge using the equation and check your answer with the calculator.

WA = WL * WH = ?