Calculate leaf and air VPD (kPa) for optimal greenhouse transpiration and mold prevention.
Execution runs 100% locally inside the browser sandbox using HTML5 Canvas, Web Cryptography Subtle API, and Web Workers. Zero egress.
Zero network latency. Operates completely offline with zero dependencies on third-party backend servers or cloud services.
Built according to official RFC specifications, cryptographic test vectors, and enterprise-grade data transformation standards.
Input air temperature in Celsius or Fahrenheit.
Input the current room relative humidity percentage (RH%).
View the calculated VPD in kPa and check whether conditions match your plant's growth stage.
During mid-to-late flowering, an ideal VPD is 1.2 to 1.6 kPa, which encourages resin production while protecting dense buds from Botrytis mold.
Plants cool their leaves below room temperature through active transpiration, typically resulting in a -1°C to -2°C offset under LED grow lights.
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