Conversion from pixel to µm²

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Conversion from pixel to µm²

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At the start of a project I used Image J which measured my cells in pixel.  I am now trying to convert the pixel measurements that have already been taken into  µm².   Is there a formula I can use to convert these pixel measurements to  µm²?

I did measure a cell in Image J once I set the scale that was given to me (to see if I got the same thing in  µm²), but the measurements are quite different.  

I would really like all measurements to be consistent.  

Please help

Thank you.