title: How is the cost for Azure Function proxy calculated?
body: <p>We have lots of images in Azure Blob Storage (LRS Hot). We calculate around 15 million downloads per month for a total of 5000 GB egress (files are on average 350kB). I can calculate the price for the Blob Storage but the Function proxy is unknown. The <a href="https://azure.microsoft.com/en-us/pricing/details/functions/" rel="nofollow noreferrer">Azure Functions pricing</a> document doesn't say anything about proxy functions and specifically about bandwidth. </p>
  
  <p><strong>Question 1</strong>: Are these calculations correct?</p>
  
  <p><em>Execution count price</em> is €0,169 per million executions, which equals to 15 * 0,169€=2,54€/month.</p>
  
  <p><em>GB-s price</em> is €0,000014/GB-s and memory usage is rounded to nearest 128MB. If file download time is 0,2s and memory is 128MB we have 0,2 * (128/1024) * 15000000 * 0,000014 = 5,25€/month</p>
  
  <p><strong>Question 2</strong>: What about bandwidth? Is there any cost for that?</p>