Question about Performance Indicators in the Hotel/Motel Industry

[David Cook]

I'm a real estate investor, but this question is actually related to another business I'm in.  We sell a green pest control product that, among other things, kills bed bugs.  Since it's non-toxic there is no restriction on the time between the treatment and reentry for staff or guests, the treatment itself is also fast compared to other treatment methods.  I want to create a website or app with form fills and a calculator that allows my pest control customers to show the financial impact of using their service vs. a competitor using alternative methods.  Is there a standard metric that measures lost revenue due to a room being down for maintenance?  I feel like there should be, but I can't seem to find one on Google.  

From what I have found I would think it might be something like:

Average TrevPOR x Overbookings that took place while a room could not be occupied due to a pest control treatment.

Any feedback or input would be greatly appreciated.  Thanks!