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Nice start Chris!

It's nice to see another calculator that actually has accurate calculations!

Suggestions...

  1. Add a toggle for liter or gallons. You can use radio buttons, check boxes or a simple label that toggles when clicked. If they want to use gallons just convert convert gallons to liters and change your volume variable. That's all I do.
  2. Dry Dose or Solution choice is easier to understand. Two simple radio buttons. If solutions then show the inputs for this. Otherwise hide them. It confuses users to see empty inputs that are not used.
  3. Instead of the suggest and manual button why not eliminate them? All you need to do is ensure you have a volume, frequency and dosing type. Otherwise show a message to enter the missing data. Enabling the inputs for dose and element amounts would be far more useful. Example, I want 7.5 ppm of NO3 using KNO3. I should be able to enter that and have the other values update. Make sense?
  4. Also, I see no trace fertilizers. I assume is was a "real estate issue" because of all the elements. Try adding just a few important ones mainly iron, then Mn, Zn and Cu. You could include a tool tip for the others.

Please don't mistake my suggestions as being negative. I've written a calculator before and I know how easy it is to not see what the users do. Just suggestions to make the interface easier to use since users could care less how it works. They just want the information with the least amount of effort. :wink2:

Also, what language did you use? If you used Javascript, HTML and CSS you can compile with Microsoft's Free visual studio and deploy to all platforms including iOS.
 
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