Enter the length and width of the building into the calculator to determine the exterior square footage. This calculator can also evaluate any of the variables given the others are known.

Exterior Square Footage Formula

The following formula is used to calculate the exterior square footage of a building.

ESF = L * W


  • ESF is the exterior square footage (sq ft) L is the length of the building (ft) W is the width of the building (ft)

To calculate the exterior square footage, multiply the length of the buildig by the width of the building. The result is the total exterior square footage.

What is an Exterior Square Footage?

Exterior square footage refers to the total measurement of all the outside space that a property has. This can include elements such as the building’s footprint, yard, driveway, patio, deck, porch, pool, and any other outdoor features. It is often used in real estate to help determine the value of a property, as larger exterior spaces can often command higher prices.

How to Calculate Exterior Square Footage?

The following steps outline how to calculate the Exterior Square Footage (ESF).

  1. First, determine the length of the building (L) in feet.
  2. Next, determine the width of the building (W) in feet.
  3. Next, gather the formula from above = ESF = L * W.
  4. Finally, calculate the Exterior Square Footage (ESF).
  5. After inserting the values for L and W into the formula and calculating the result, check your answer with the calculator above.

Example Problem:

Use the following variables as an example problem to test your knowledge.

Length of the building (L) = 10 ft

Width of the building (W) = 8 ft