Cannabis CO₂ Use and Cost Calculator

Room size controls the first fill. Leakage, ventilation, controller behavior, and crop use control how much CO₂ is needed afterward.

1. Enter the inside room dimensions, temperature, starting ppm, and target ppm.
2. Enter estimated leakage and leave measured crop use at zero unless you have drawdown data.
3. Enter enrichment hours, the number of days being priced, tank size, and tank price.
4. Enter dry output from the same period to calculate CO₂ cost per pound.

• A high ppm setting is not automatically useful; light, temperature, and plant health still matter.
• Use a calibrated controller plus a separate safety monitor and alarm.
• Compare actual tank use with the estimate. Excess use often means leakage or controller overshoot.

This is a gas-use estimate, not a safety or regulator design. It cannot replace alarms, ventilation, interlocks, or written entry procedures.

Sources

• Chandra et al.: Cannabis photosynthetic response to PPFD, temperature and CO₂
• NIOSH Pocket Guide: Carbon dioxide exposure limits and hazards
• NIST Chemistry WebBook: Carbon dioxide molecular data