title: Return a formula value to a cell and add to existing data in google sheets
body: <p>In <code>Google-Spreadsheet</code> I have the below setup</p>
  
  <pre><code>B3 is set up using "Custom Formatting" : ##"°F/"##"°C"
  B2 contains the formula: =ROUND(CONVERT(B3, "F", "C"))
  
  B3=90
  B2=32
  </code></pre>
  
  <p>What I desire to happen:</p>
  
  <pre><code>Input 90 into B3 resulting in Output B3 "90°F/32°C"; and, no visible output in B2.
  </code></pre>
  
  <p>I'm thinking to <code>=CONCATENATE(B3,B2)</code> but, I get infinite loop error.
  I would then like to repeat the formula in <code>B2 for B4, B5, B6, etc</code>.</p>