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CO₂ Enrichment Calculator

Work out how much CO₂ your grow room needs, and how long a bottle or burner will last

Room & Units

Unit System

Length (m)

Width (m)

Height (m)

Air Changes / Hour (ACH)

~0.1 sealed · ~0.5 average · ~1 leaky. Keep low while enriching.

Enrichment Hours / Day

Usually lights-on only: plants don’t use CO₂ in the dark.

CO₂ Target

Ambient CO₂ (ppm)

Fresh outdoor air ≈ 420 ppm; indoor can sit higher.

Target CO₂ (ppm)

Typical enrichment 800-1500 ppm, only worthwhile with strong light & warmth.

CO₂ Source

Source

Bottle Size (kg of CO₂)

Net CO₂ weight, e.g. 6 kg or 10 kg cylinder.