Calculate Site Coverage

[Anonymous]

Are there any tricks, or something really obvious I am missing to calculate site coverage in Revit through schedules?

At the moment, I have a calculated value and manual formula, which works fine, but the reason for my enquiry is the scenario I have come across twice now, is the subject site lot area has changed due to master planning options, and each time the subject site boundaries change, I have to manually update the formula... an accident waiting to happen... 

the math is Site Coverage (%) = Total Building Area x 100 / Total Site Area

So let's go with 300x100 / 450m² = 66% Site coverage. 

The problem I have is, I need two schemes to document this in Area plans, and you can't connect these in a formula... 

Any other ideas? (I can't use dynamo in this instance either)

thanks in advance for any help.

[Anonymous]

and the answer is... something really obvious.. 

For those who are looking for a similar solution... 

[Anonymous]

This answer stinks. Why would the site, likely measured to calculate FAR coverage, be measured in the 'rentable' category, which is meant for unit interior dimensions. This screws u schedules down the line. Bad answer. Revit needs a category for site area totals that isnt 'building gross' or 'building rentable'. 

[ToanDN]

'Rentable' is just the name of the Area scheme. You can create new Area schemes and name them however you want, such as 'Not Rentable', or 'Stink', or 'Site Coverage'.