Enter the total floor area and the net usable area into the calculator to determine the building efficiency ratio.
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Building Efficiency Ratio Formula
The following formula is used to calculate the building efficiency ratio for a given total floor area and net usable area.
ER = (NUA / TFA) * 100
Variables:
- ER is the efficiency ratio (%)
- NUA is the net usable area (sq ft)
- TFA is the total floor area (sq ft)
To calculate the building efficiency ratio, divide the net usable area by the total floor area. Multiply the result by 100 to convert it to a percentage.
What is a Building Efficiency Ratio?
The building efficiency ratio is a measure of how effectively a building’s total floor area is utilized for its intended purpose. It is expressed as a percentage and is calculated by dividing the net usable area by the total floor area. A higher efficiency ratio indicates that a larger portion of the building’s total floor area is being used for its intended purpose, while a lower efficiency ratio suggests that a significant portion of the building’s floor area is being used for non-usable purposes such as hallways, mechanical rooms, and other non-usable spaces.
How to Calculate Building Efficiency Ratio?
The following steps outline how to calculate the Building Efficiency Ratio.
- First, determine the total floor area (TFA) of the building.
- Next, determine the net usable area (NUA) of the building.
- Next, calculate the efficiency ratio using the formula ER = (NUA / TFA) * 100.
- Finally, calculate the Building Efficiency Ratio.
- After inserting the values 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 Floor Area (TFA) = 10,000 sq ft
Net Usable Area (NUA) = 7,500 sq ft