Grower Calculators & Tools

Free online tools for indoor cultivators, powered by Hortibase

VPD Calculator

Calculate Vapour Pressure Deficit from air temperature and relative humidity.

Convert between Electrical Conductivity (mS/cm) and PPM at 500, 640, and 700 scales.

Convert between PPFD and Daily Light Integral (DLI) for any photoperiod.

Calculate how much nutrient concentrate to add for any volume at your target dose rate.

Convert lux meter readings to PPFD (μmol/m²/s) for HPS, LED, CMH, MH, and T5 fixtures.

Calculate the extraction fan size needed for your grow room based on volume and target air changes.

All calculators run locally in your browser. No data is sent to any server.