Convert Excel formula to Javascript

Good Afternoon all.

I'm looking for some help with converting a Excel formula into Javascript and have no working knowkledge of Javascript. Here is the Excel formula =+G29*((G30-G28)/(G30-G31))^0.54. I have attached the converted PDF and the excel spread sheet.  g29-Qtest Flow = Text16, G30- Static PSI =20Row2, G28-Flow @ x PSI+Text16, G30- Static PSI =20Row2, G31- Residual PSI=20Row3. ANy help with this would be greatly appreciated. TIA