Technical tools for
serious growers
8 precision calculators for hydroponic and indoor cultivation. No registration, no popups — science-backed results in seconds.
VPD Calculator
Vapor pressure deficit with interactive heatmap. Know your exact growing zone.
EC ↔ PPM Converter
Convert between EC and PPM across 500, 640, and 700 scales instantly.
DLI Calculator
Daily light integral from PPFD and photoperiod. Match your crop's light targets.
PPFD Estimator
Estimate light intensity from LED wattage and efficacy. No PAR meter needed.
BTU Calculator
Heat load and extraction fan sizing for any tent or room setup.
Dew Point Calculator
Dew point, absolute humidity, and condensation risk. Prevent mold before it starts.
NPK Ratio Calculator
Analyze nitrogen, phosphorus and potassium ratios against ideal targets by stage.
Reservoir Calculator
Calculate water and concentrate to add when mixing or topping off your reservoir.
Technical Guides
Instant results
All calculations run client-side. Zero latency, works offline after first load.
Shareable URLs
Every result is encoded in the URL. Copy and share your exact parameters.
Science-backed
Formulas from published research. Ranges curated from scientific literature and grower consensus.