Tools
Free Hydroponic Calculators
EC to PPM, DLI, grow light coverage and distance, pH dosing, Master Blend, and more — free, no account.
Nutrients
Nutrient Mixing Calculator
Calculate exact nutrient amounts for your reservoir based on volume and concentration ratios.
Inputs: Reservoir size, Nutrient A dosage, Nutrient B dosage
Outputs: Total nutrient required, Step-by-step mixing instructions
Setup
Reservoir Volume Calculator
Calculate the volume of your reservoir in litres or gallons based on container dimensions.
Inputs: Container dimensions, Shape
Outputs: Volume in litres, Volume in US/UK gallons
Nutrients
EC to PPM Converter (500 vs 700)
Convert between Electrical Conductivity (EC) and PPM across 500, 640, and 700 TDS scales.
Inputs: EC value or PPM value, TDS scale
Outputs: Converted values across all scales
Nutrients
pH Adjustment Calculator (Up/Down)
Estimate how much pH Up or pH Down solution is needed to reach your target pH.
Inputs: Current pH, Target pH, Reservoir volume
Outputs: Estimated pH Up/Down amount
Lighting
Grow Light Coverage & Distance Calculator
Plan grow light coverage and hanging distance from wattage and height for leafy greens and indoor tents.
Inputs: Grow area, Light wattage, Hanging height
Outputs: Recommended coverage, Coverage efficiency
Lighting
DLI Calculator — Free PPFD Tool
Calculate Daily Light Integral from PPFD and your light schedule to optimise photosynthesis.
Inputs: PPFD value, Light hours per day
Outputs: DLI in mol/m²/day, Target comparison
Environment
Water Temperature Checker
Check if your water temperature is in the ideal range and learn what to do if it is not.
Inputs: Current water temperature
Outputs: Status indicator, Recommendations
Environment
Humidity Calculator
Get recommended humidity and VPD ranges based on your plant growth stage and leaf temperature.
Inputs: Plant stage, Leaf temperature, Ambient humidity
Outputs: Recommended humidity, VPD value, Status
Setup
Hydroponic System Selector
Answer a few questions to get a personalised hydroponic system recommendation for your setup.
Inputs: Budget, Indoor/Outdoor, Plant type, Experience level
Outputs: Recommended system, Why it fits, Alternative options
Nutrients
Master Blend Calculator
Dose MasterBlend 4-18-38, calcium nitrate, and Epsom salt by reservoir volume — classic dry-salt hydro recipe.
Inputs: Reservoir volume, g/gal rates, Strength %
Outputs: Grams of each salt to weigh
Nutrients
Reservoir Top-Off Calculator
Estimate how much plain water vs nutrient solution to add when volume drops and EC drifts.
Inputs: Current volume, Full volume, Current EC, Target EC, Feed EC
Outputs: Water to add, Nutrient solution to add
Lighting
Grow Light Distance Calculator
Estimate starting hang height for seedlings, leafy greens, or fruiting crops from fixture wattage.
Inputs: Fixture watts, Crop class
Outputs: Suggested hang range, Target PPFD band
Nutrients
Flora Series Calculator (GH 3-Part)
Dose FloraMicro, FloraGro, and FloraBloom by reservoir volume from classic stage charts — then verify with EC.
Inputs: Reservoir volume, Stage ml/gal rates, Strength %
Outputs: ml of Micro, Gro, and Bloom