Observed arrival · 2026-11-04
VPD Calculator for Cannabis
A browser-based grow-room calculator for leaf VPD, with charts and companion tools for humidity, lighting, airflow, and equipment sizing.
○Open
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$Paid
†Ads
✦Pretty
●Pro
◎Niche
◉Human
⚑Risk
ƒJS
- For
- Indoor cannabis growers
- Worth noticing
- The live chart supports arrow-key navigation; saved readings can be exported as CSV, and the chart can be downloaded as a PNG.
Field notes
The main calculator takes air temperature and relative humidity, with optional leaf temperature or an offset, growth stage, lighting type, and CO₂ setting. It displays leaf VPD alongside related readings, while separate calculators address room equipment, lighting, CO₂, and electricity. A reading log and chart controls are visible, including CSV import and export and PNG download; the wet-bulb input notes a sea-level psychrometer assumption.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
○OpenPublic substance visible
✦PrettyNotable craft visible
●ProPolished or operationally mature
◎NicheUnusually specific use
ƒJavaScriptBrowser-side code central
One card from the complete issue