Use this procedure to specify an area calculation standard for a drawing. The standard defines the calculation of the individual boundaries according to the rules of the chosen standard. 
 AutoCAD Architecture 2022 toolset ships with a number of predefined area calculation standards based on the rules of these country-specific standards: 
- BOMA standard (USA) 
 
- DIN-277 standard (Germany) 
 
- SIS standard (Sweden) 
 
- Basic standard (Generic standard) 
 
Note: An area calculation standard can be used only for associative spaces. The boundaries of non-associative spaces can only be calculated in the space style or modified manually. 
- Click 

Options.  
- Click the AEC Object Settings tab. 
 
 
- For Calculation Standard, select the area calculation standard you want to use when generating spaces from your floor plan. 
 
- Click OK. 
Tip: Alternatively, you can set the area calculation standard on the command line by entering aecspacecalculationstandard.