Free hydroponics tools and calculators
Small, fast tools that answer the questions people actually ask before they buy anything. No sign-up, no email wall.
Which system should you build?
Answer five questions and see all six system types ranked for your budget, space, crop and how often you are away from home.
Compare systemsGrow light running cost
What your light costs per day, month, year and harvest, using real electricity rates for your state. Add pumps and fans too.
Open the calculatorNutrient dosing
Turn any label dose into the exact amount for your jar, bottle or bucket, at the right strength for the growth stage.
Open the calculatorThe Weekly Grow
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