I'm working up a spreadsheet to help project GAE costs for an application. 
 Basically I want to do stuff like:

   - enumerate all the kinds of requests the service will be receiving, and 
   for each one identify the number of datastore small/read/write operations 
   per request, the number of requests/day, then factor in the daily free 
   quota and the cost per small/read/write op over the quota.  
   - For each request type, estimate the frontend/backend CPU time per 
   request, add it all up per day, apply the quotas, cost per unit time over 
   quota, etc.
   - enumerate all the datastore entity kinds I'll be storing, how big each 
   is on average, how many of them there will be, then factor in the free 
   quota and the monthly charge per GB over that quota
   - and so on for things like network trafffic, all the other APIs that 
   have free quotas and over-quota costs, you get the idea...


So... obviously I'm not the first person to ever do this.  If you've put 
together a useful spreadsheet template, how about sharing?

-Andy Dennie


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