๐ก DLI Calculator
Daily Light Integral
DLI = (PPFD ร hours ร 3600) / 1,000,000
Seedling: 15-25 | Veg: 25-40 | Flower: 40-65 mol/mยฒ/day
Seedling: 15-25 | Veg: 25-40 | Flower: 40-65 mol/mยฒ/day
๐ก PPFD Calculator
Estimate PPFD from wattage
Estimated PPFD at canopy level. Actual values vary by fixture.
๐ก Light Height Calculator
Optimal distance from canopy
Recommended starting distance. Adjust based on plant response.
๐ก Watts per Sq Ft
Light density calculator
LED: 30-40W/sqft | HPS: 50-70W/sqft
๐ก Light Cycle Timer
Photoperiod schedules
18/6 for veg | 12/12 for flower | 20/4 or 24/0 for autos
๐ก๏ธ VPD Calculator
Vapor Pressure Deficit
Seedling: 0.4-0.8 | Veg: 0.8-1.2 | Flower: 1.0-1.5 kPa
๐ก๏ธ CFM/Ventilation
Required airflow
Standard: 1 air change/min | High odor/humidity: 2-3 changes/min
๐ก๏ธ BTU Calculator
Heating/cooling needs
Includes base room cooling + light heat + plant transpiration
๐ก๏ธ CO2 Flow Rate
CO2 injection calculator
Optimal CO2: 1000-1500 PPM during lights-on
๐ก๏ธ Dehumidifier Sizing
Capacity needed
Based on room size + plant transpiration rate
๐งช NPK Calculator
Nutrient ratios
Veg: High N (3-1-2) | Flower: High P,K (1-3-2)
๐งช EC/PPM Converter
Convert EC โ PPM
EC ร 500 = PPM (US scale) | EC ร 700 = PPM (EU scale)
๐งช pH Adjuster
pH up/down dosage
Soil: 6.0-7.0 | Hydro: 5.5-6.5 | Coco: 5.8-6.2
๐งช Nutrient Mixing
Mix for reservoir size
Add Part A first, mix, then Part B to avoid precipitation
๐งช Reservoir Volume
Calculate water needed
231 cubic inches = 1 gallon
๐ Room Size Planner
Optimal plant layout
Leave 20-30% space for walkways and equipment
๐ Pot Size Guide
Recommended container size
Fabric pots promote better root development
๐ Soil Volume
Calculate soil needed
Account for settling - soil compacts over time
๐ Grow Tent Sizing
Recommended tent size
Allow extra space for equipment and airflow
๐ Yield Estimator
Estimated harvest
Rule of thumb: 0.5-1g per watt for LED, 0.5g per watt for HPS
๐ Harvest Window
Estimate harvest date
Check trichomes! Breeder times are estimates
๐ Water/Nutrient Schedule
Feeding frequency
Water when top 1-2 inches of soil is dry
๐ Carbon Filter Sizing
CFM match for odor control
Filter CFM should be 20-25% higher than fan CFM
๐ฐ Electricity Cost
Monthly power cost
US average: $0.12/kWh | CA: $0.20+ | TX: $0.10
๐ฐ Cost Per Gram
Track grow efficiency
Track costs over multiple grows to improve efficiency