VPD: Air & Leaf Calculator

Calculate air or leaf VPD instantly from temperature and humidity. Switch between °F and °C, spot possible condensation, and keep working completely offline.

Know your vapor pressure deficit at a glance.

VPD is a fast, focused calculator for monitoring plant-growing conditions. Enter air temperature and relative humidity for an instant Air VPD reading. Turn on leaf temperature when you want a leaf-specific result.

Features: • Live VPD calculations in kPa • Air VPD and optional Leaf VPD • Editable values and smooth, one-handed sliders • °F and °C conversion that preserves the actual temperature • Negative leaf VPD retained with a clear possible-condensation warning • Your latest values and temperature unit remembered automatically • Fully offline • No account, ads, subscriptions, analytics, or tracking

Whether you’re checking a grow room, greenhouse, or garden, VPD gives you the number you need without dashboards or distractions.

VPD is a calculation aid, not a replacement for calibrated sensors or professional cultivation advice.