The target strength field is required.
The wvpga field is required.
The pg goal field is required.
The vg goal field is required.
              
              
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            Welcome to the forum …There are a few threads that should help. I dont use a premix base so i cant help , im sure someine will chime in . I searched " how to use premix on calculator" and ila few threads came up  . Search Bar is located at top of page:mag:

              
              
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            Much easier to just enter 0mg for nic and checkmark max vg. Works well for me.
              
              
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            It doesn’t save using a premix base, a glitch that hasn’t been fixed afaik,
What I do is just take a screenshot of the recipe (before trying to save) then you can use the screenshot to mix it accurately 
Oh yeah,
And welcome to ELR
              
              
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