Grow Tools
Dial it in with numbers.
Stop guessing. Calculate your VPD, your daily light, and your likely yield — matched to each stage of the grow.
VPD Calculator
Too highVapor Pressure Deficit — the temp + humidity sweet spot that controls how your plant drinks and grows.
1.26
kPa
Target for vegetative:
0.8–1.2 kPa
Tip: raise VPD by warming or drying the air; lower it by cooling or adding humidity. Leaf temp usually runs a couple degrees below air temp.
DLI / Light Calculator
Too highDaily Light Integral — the total light your plants get per day. Match it to the stage instead of guessing.
38.9
mol/m²/day
Target for vegetative:
20–30
Measure PPFD with a meter or app at canopy height. Too high wastes power and bleaches; too low means airy buds.
Yield Estimator
Rough guideA ballpark dried-flower estimate from your real light wattage and experience. Genetics and technique swing this a lot.
120–192 g
≈ 4.2–6.8 oz dried
Based on grams-per-watt of quality LED. A dialed room, training, and strong genetics push you toward the top of the range.
More tools coming
Feeding-schedule builder, pot-size guide, and a harvest-window checker are on the way. Meanwhile, the Build My Grow tool turns your setup into a full plan, and the AI Plant Doctor answers anything these numbers can't.
Educational estimates for home growers — targets are typical ranges, not hard rules. Your genetics, environment, and technique always have the final say.