Tools you might need next
Calculate grow light coverage, PPFD, and DLI for indoor hydroponic and cannabis cultivation. LED wattage and hanging height guide.
Calculate hydroponic reservoir volume from plant count, system type, and refill interval. Size nutrient tanks for DWC, NFT, and drip systems.
Calculate hydroponic NPK nutrient mixing ratios and ppm targets for vegetative and flowering stages. Reservoir dosing guide.
Lettuce: 4–6 plants/sq ft. Cannabis: 1 plant/4–9 sq ft. Tomatoes: 1 plant/4 sq ft. Spacing depends on crop and training method.
Plants = Floor area ÷ Spacing² per cropModern LEDs achieve target PPFD at 30–50 W/sq ft. Older HID needed 50–65 W/sq ft. Match to DLI targets for your crop.
Watts ≈ 30–50 W/sq ft (modern LED) for high-light cropsTarget 20–60 air exchanges per hour depending on heat load. Add 25% for duct friction and filter resistance.
CFM = Room volume (cu ft) × Air exchanges/hr ÷ 60Updated: July 2026
64 sq ft supports 9–16 cannabis plants at 4–7 sq ft each. Two 480W LED fixtures, 800 CFM exhaust for heat and odor control.
6 sq ft fits 1–2 small plants. 100W LED, 50 CFM inline fan with carbon filter for odor management.
1000 sq ft floor with 4-tier racks = 4000 sq ft growing area at 5 plants/sq ft — 20,000 heads per cycle.
Design an efficient grow room by calculating usable plant capacity, lighting requirements, ventilation CFM, and environmental load from your room dimensions and cultivation goals.