title: How to estimate hosting services cost on GAE?
body: <p>I'm building a system which I plan to deploy on <strong>Google App Engine</strong>. Current pricing is described here:</p>
  
  <p><a href="http://www.google.com/enterprise/cloud/appengine/pricing.html">Google App Engine - Pricing and Features</a></p>
  
  <p>I need an estimate of cost per client managed by the webapp. The cost won't be very accurate until I have completed the development. GAE uses such fine grained price calculation such as READs and WRITEs that it becomes a very daunting task to estimate operation cost per user.</p>
  
  <p>I have an agile dev. process which leaves me even more clueless in determining my cost. I've been exploiting my users stories to create a cost baseline per user story. Then I roughly estimate how will the user execute each story workflow to finally compute a simplistic estimation.</p>
  
  <p>As I see it, computing estimates for Datastore API is overly complex for a startup project. The other costs are a bit easier to grasp. Unfortunately, I need to give an approximate cost to my manager!</p>
  
  <p>Has anyone undergone such a task? Any pointers would be great, regarding tools, examples, or any other related information.</p>
  
  <p>Thank you.</p>