Tools
Calculators and spreadsheets we use or recommend, by topic. They are third-party tools; our own sizing tools will be published here when ready.
Nutrient solution calculators
HydroBuddy
Free, open-source desktop program: from target concentrations to grams of each salt, with a large salt database.
Open →NS Calculator (Wageningen University)
Spreadsheet from the EUPHOROS project for greenhouse nutrient solutions.
Open →Custom Hydro Nutrients formula calculator (archived)
Older web calculator kept on the Internet Archive; use with care.
Open →Purdue: nutrient calculations for hydroponic crops (slides)
Presentation slides on how the calculations work, by Purdue University.
Open →Lighting
SAG plant lighting guide
Long-running community guide to grow lighting; written for cannabis growers, the physics applies to any crop.
Open →Pumps, plumbing and sizing
Hydroponics tool kit (archived)
Grow lighting, nutrient formula, set-up cost and nutrient injector calculators, kept on the Internet Archive.
Open →Planning and cost
Freight Farms investment calculator
A vendor's calculator for container-farm economics; useful for the order of magnitude.
Open →