free tools
Calculators for your grow
Three quick tools to settle the question on the spot: is the environment dialed in? Calculate VPD, DLI and EC/PPM right in your browser — no signup, no ads, no data ever sent anywhere.
VPD Calculator
Find out whether your temperature and humidity combo is right for the plant's current stage — and what to adjust when it isn't.
calculate VPDDLI Calculator
Convert light intensity (PPFD) and photoperiod into the total light your plant gets per day — the metric that best explains growth.
calculate DLIEC / PPM Converter
Convert between EC (mS/cm) and PPM on the 500 and 700 scales — and see why two meters can show different numbers for the same solution.
convert EC/PPMget the app
log every plant, feeding, photo and metric from seed to harvest. no login, no cloud, no ads, no subscription. buy it once, it's yours.