The toolbox
18 calculators and AI utilities. Calculators are free with no signup; tools marked PRO need a Grower plan. Pro members can save every run to a notebook.
// AI TOOLpopular
Diagnose.
upload a leaf → cause + fix.
// CALCutility
AI Plant Diagnosis
Upload a leaf photo and get an instant, confidence-scored diagnosis of nutrient deficiencies, pests, root rot, and pH stress — plus a corrective dosing plan built for hydroponic growers.
// CALCmix
Hydroponic Nutrient Calculator
Educational grams estimate only: assumed 1.2 EC per g/L; fixed Grow/Micro/Bloom ratios 50/30/20 (veg), 20/30/50 (flower). No product calibration, liquid dosing, custom recipes or source-water EC. Follow your manufacturer’s recipe and measure EC.
// CALCEC
EC to PPM Converter
Convert between EC (mS/cm) and PPM (TDS) using the 500 or 700 scale. Learn why EC is the most accurate way to measure hydroponic nutrient strength.
// CALCutility
Hydroponic VPD Calculator
Calculate Vapor Pressure Deficit (VPD) for your grow room. Learn how VPD affects nutrient uptake, transpiration, and how to hit your growth targets.
// CALCDLI
Daily Light Integral (DLI) Calculator
Calculate your Daily Light Integral (DLI) from PPFD and photoperiod. Learn how much light your plants actually need over a 24-hour period.
// CALCpH
Hydroponic pH Adjustment Calculator
pH difference is not a dose. Product strength and water alkalinity determine the amount. Follow the product label, add a small measured increment, mix and remeasure before adding more. Equal readings need no adjustment.
// CALClight
LED Watt Density Calculator
Electrical watts per area only. This does not calculate PPFD or hanging height. Use the fixture’s PPFD chart and measured canopy light.
// CALCvolume
Hydroponic Reservoir Volume Calculator
Rectangular containers only: length × width × depth ÷ 1000 = liters. Reservoir Volume shows liters and a rough 4 L/plant example. Water Volume also shows US gallons and an illustrative 90% fill; this is not a tank-specific safe level. Cylinders require a separate manual calculation.
// CALCscale
Hydroponic System Sizer
Illustrative reservoir volume and USD budget by system and plant count only; no crop, spacing, area, yield or lighting model.
// AIquiz
AI Hydroponic System Recommender
Not sure which hydroponic system to build? Our AI quiz analyzes your space, budget, and goals to recommend the ideal DWC, NFT, or Kratky setup.
// AIPRO · GROWER
Commercial Hydroponic ROI Estimator
Calculate the Return on Investment (ROI) for your hydroponic project. Estimate capex, opex, and revenue to find your breakeven point.
// AIPRO · GROWER
AI Equipment Kit Builder
Use AI to build a complete hydroponic equipment list based on your budget, space, and goals. Get a tailored shopping list for your first build.
// AIPRO · GROWER
Hydroponic Crop Planner
Manage your entire grow cycle with our advanced crop planner. Track weeks, nutrient changes, and environmental targets for maximum yield.
// AIPRO · GROWER
AI Nutrient Deficiency ID
Upload a photo of your plant and use AI to identify nutrient deficiencies, pests, and diseases. Get instant treatment steps for your hydroponic garden.
// CALCsize
Hydroponic Reservoir Sizer
Calculate the ideal reservoir size for your plant count. Estimate refill intervals and evaporation buffers to maintain stable EC and pH.
// CALCvolume
Water Volume Calculator
Rectangular containers only: length × width × depth ÷ 1000 = liters. Reservoir Volume shows liters and a rough 4 L/plant example. Water Volume also shows US gallons and an illustrative 90% fill; this is not a tank-specific safe level. Cylinders require a separate manual calculation.
// CALCDO
Root-Temp DO Calculator
Calculate the maximum Dissolved Oxygen (DO) your reservoir can hold based on temperature. Prevent root rot and suffocation in DWC systems.
// PLANcalendar
Hydroponic Germination Calendar
Five fixed example schedules, not cultivar predictions: lettuce 32, basil 40, tomato 70, strawberry 100, pepper 80 days from sowing. Adjust for your seed supplier and growing conditions.
Frequently asked
- Are these hydroponic calculators free?
- Yes. Every calculator is free, needs no account, and has no usage limit. Some AI tools have a free daily allowance.
- Which calculator should I start with?
- The nutrient calculator for mixing your reservoir, then the pH and EC↔PPM tools to check it. Use the VPD and DLI calculators once your plants are under lights.
- How accurate are the results?
- Each calculator uses the standard formula shown on its page. Results are starting points; confirm with a calibrated pH and EC meter in your own reservoir.