free tools
Tools for your grow
Quick calculators and guides to settle the question on the spot: VPD, DLI, EC/PPM and today's moon phase, 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/PPMMoon Phases
See today's moon phase and what it favors in the grow: germination, transplant, pruning or harvest. A full guide to all 8 phases.
see today's moonget 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.