Enter the total lot area and the building footprint area into the calculator to determine the building coverage ratio. This ratio is expressed as a percentage of the lot that is covered by the building.

Building Coverage Ratio Formula

The following formula is used to calculate the building coverage ratio:

BCR = (BF / LA) * 100

Variables:

  • BCR is the building coverage ratio (%)
  • BF is the building footprint area (square feet)
  • LA is the total lot area (square feet)

To calculate the building coverage ratio, divide the building footprint area by the total lot area and then multiply by 100 to convert it to a percentage.

What is Building Coverage Ratio?

The building coverage ratio is a measure of how much of a property’s lot is occupied by the building itself. It is an important metric in urban planning and zoning regulations, as it helps to determine the density of development and ensure that there is sufficient open space on a property. This ratio is typically regulated by local zoning laws to maintain the character of a neighborhood and prevent overdevelopment.

How to Calculate Building Coverage Ratio?

The following steps outline how to calculate the Building Coverage Ratio.


  1. First, determine the total lot area (LA) in square feet.
  2. Next, determine the building footprint area (BF) in square feet.
  3. Next, gather the formula from above = BCR = (BF / LA) * 100.
  4. Finally, calculate the Building Coverage Ratio (BCR) in percentage.
  5. After inserting the variables 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.

total lot area (LA) = 10,000 square feet

building footprint area (BF) = 2,500 square feet