Enter the theoretical area (ft^2) and the measured area (ft^2) into the Calculator. The calculator will evaluate the Error In Area. 

Error In Area Formula

EIA = (TA - MA) / TA * 100


  • EIA is the Error In Area (%)
  • TA is the theoretical area (ft^2)
  • MA is the measured area (ft^2)

To calculate the Error In Area, divide the difference between the theoretical area and measured area by the theoretical area, then multiply by 100.

How to Calculate Error In Area?

The following steps outline how to calculate the Error In Area.

  1. First, determine the theoretical area (ft^2). 
  2. Next, determine the measured area (ft^2). 
  3. Next, gather the formula from above = EIA = (TA – MA) / TA * 100.
  4. Finally, calculate the Error In Area.
  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.

theoretical area (ft^2) = 15

measured area (ft^2) = 10