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Sproutsheet – an easy way to plan and organize your growing

Hydroponic Nutrient Calculator – Github based free software calculator

NS Calculator – Spreadsheet by the Wageningen University

HydroBuddy – The First Free Open Source Hydroponic Nutrient Calculator Program Available Online

Purdue’s Nutrient Calculations – Presentation Slides about Nutrition Calculations for Hydroponic Crops, by Purdue University

Hydroponics Tool Kit – Includes grow lighting, nutrient formula, setup cost, and nutrient injector calculators

SAG Plant Lighting Guide – Both the single post and the overall subreddit are focused on lighting for the hemp plants industry

Pump & Sizing calculator – For any plumbing/building needs

Canna-calc – Collection of grow calculators, growing calculators, concentrate calculators, CO2 and BTU math, and more!

Custom Hydroponic Nutrient Solution Formula Calculator – Use at your own risk!

HydroTek’s Calculators – A collection of calculators related to electrical costs, lighting, CO2, water, etc

NFT Hydro’s Calculator – Simple nutrient calculator

Hydroponics Cost Calculator – A way to estimate your total setup expenses for a hydroponics system

Farming Profit Calculator – To estimate your annual profitability and payback period

Hydrosolver – Python based pptimization driven hydroponic nutrient calculator and a domain-specific language