Tools you might need next
Calculate hydroponic NPK nutrient mixing ratios and ppm targets for vegetative and flowering stages. Reservoir dosing guide.
Plan indoor grow room dimensions, plant capacity, lighting, and ventilation CFM requirements for hydroponic cultivation.
Calculate pH Up and pH Down dosing for hydroponic nutrient solutions. Milliliters needed to reach target pH from current reading.
Deep water culture needs large per-plant volume. NFT and drip systems recirculate from a shared reservoir sized for total system demand.
DWC: 2–5 gal/plant | NFT: 0.1–0.3 gal/plant (flow) | Drip: 0.5–1 gal/plantTranspiration and evaporation deplete reservoirs daily. Size for 3–7 days between full changes or plan daily top-off volume.
Uptake ≈ 1–3% reservoir volume/day (mature plants)Add 20% safety margin for root zone expansion and evaporation. Larger reservoirs buffer pH/EC fluctuations.
Min volume = Plants × Per-plant volume × Safety factor (1.2)Updated: July 2026
4 large tomato plants at 5 gal each = 20 gal minimum. Use four 5-gallon buckets or single 25-gal tote with 20% margin.
200 lettuce heads on NFT channels with 50-gal reservoir — 0.25 gal/plant recirculated, changed weekly.
6 plants × 1 gal = 6 gal minimum reservoir. 10-gal tote provides buffer for 5-day change interval.
Undersized reservoirs cause rapid pH and EC swings; oversized tanks waste space and nutrients. Enter number of plants, system type, and desired days between full changes to calculate minimum reservoir volume.