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💨

CO2 Supplementation

Ambient ~400 ppm. Vegetative 800–1000 ppm, flowering 1200–1500 ppm. Room volume × (target − current) × exchange factor.

Concept Fundamentals
—
CO2 Needed
—
Rate
—
Tank
1200 ppm
Target
Calculate CO2 Supplementationppm supplementation

Why This Biology Metric Matters

Why: CO2 above ambient (400 ppm) boosts photosynthesis. Sealed rooms need supplementation. Ventilation dilutes CO2.

How: CO2 needed = room volume × (target − current) ppm × factor. Account for air exchange rate. Tank duration from consumption.

  • ●Vegetative 800–1000 ppm. Flowering 1200–1500 ppm. Max 2000 ppm.
  • ●Sealed rooms: no exchange. Ventilated: account for air changes.
  • ●Safety: 5000+ ppm harmful. Use controller and ventilation.
Sources:USDAPurdue University

Calculate CO2 supplementation for indoor grow rooms. Tank sizing, injection rates, consumption, and costs.

Compact Examples

Small Grow Tent

4x4x7 tent for home growing

Medium Grow Room

10x10x8 room for medium operation

Large Commercial

20x30x10 commercial facility

Greenhouse Setup

30x50x12 greenhouse operation

Room & CO2 Parameters

Enter Grow Room Information

Length of grow room
Width of grow room
Height of grow room
Desired CO2 level (400-2000)
Current CO2 level (usually 400)
Air exchanges per hour (0-10)
Number of plants

For educational use only. Always confirm dosages and care with a licensed veterinarian.

🧬 Biology Facts

💨

Ambient CO2 ~400 ppm. Plants use CO2 for photosynthesis.

— Extension

📊

Optimal 1200–1500 ppm for flowering. Diminishing returns above 1500.

— USDA

🛢️

20 lb tank ≈ 160 ft³ CO2. Duration depends on room size and target.

— Purdue

⚠️

5000+ ppm dangerous. Ensure ventilation and CO2 monitor.

— Safety

📋 Key Takeaways

  • • CO₂ (ft³) = Room Volume × (Target PPM − Current PPM) / 1,000,000 — base requirement.
  • • 800–1500 ppm optimal for vegetative/flowering. Never exceed 5000 ppm (safety).
  • • Use CO2 only during light hours. High ventilation wastes CO2.
  • • Combine with high-intensity lighting, optimal temp (75–85°F), and sealed/controlled rooms.

💡 Did You Know?

🌱CO2 can increase growth 20–40% and flowering yields 30–50% vs ambient.Source: Horticulture
📊Ambient air ≈ 400 ppm. Target 800–1000 veg, 1200–1500 flowering.Source: PPM levels
⏰Release CO2 only during light hours. Plants don't use it in dark.Source: Photosynthesis
💨Air exchange removes CO2. Each exchange/hr adds ~10% to needs.Source: Ventilation
🛡️Never exceed 5000 ppm. Use CO2 monitors and alarms.Source: Safety
🔧20 lb tank ≈ 10–15 days in 10×10×8 room at 12h/day.Source: Tank sizing

📖 How CO2 Supplementation Works

Plants use CO2 during photosynthesis. Higher CO2 (800–1500 ppm) increases growth when combined with strong light, optimal temp, and nutrients.

Core Formula

CO₂ (ft³) = Room Volume × (Target PPM − Current PPM) / 1,000,000

Adjust for air exchange. Injection rate = adjusted CO2 needed per hour.

🎯 Expert Tips

💡 Use During Light Hours Only

Plants don't use CO2 in dark. Match injection to light cycle.

💡 Sealed Rooms Work Best

High ventilation wastes CO2. Control or minimize air exchange.

💡 Combine with Strong Light

CO2 helps most with high-intensity lighting (LED, HPS).

💡 Safety First

Use CO2 monitors. Never exceed 5000 ppm.

⚖️ PPM Levels

LevelPPMUse Case
Ambient400 ppmNo supplementation needed
Vegetative800-1000 ppmSeedlings, clones, early growth
Flowering1200-1500 ppmFlowering phase, maximum yield
Maximum1500-2000 ppmCommercial operations, sealed rooms

❓ Frequently Asked Questions

How much CO2 do I need?

Depends on room volume, target PPM, current PPM, and air exchange. Use this calculator for your setup.

What PPM level?

Vegetative: 800–1000 ppm. Flowering: 1200–1500 ppm. Never exceed 2000 ppm without monitoring.

How long will a tank last?

20 lb tank ≈ 10–15 days in 10×10×8 room at 12h/day. Calculator gives specific estimates.

Do I need CO2?

Best in sealed rooms with high-intensity lighting. High ventilation or low light = less benefit.

When to release CO2?

Only during light hours. Plants don't use CO2 in dark. Match to light cycle.

📊 CO2 by the Numbers

400
Ambient ppm
800–1500
Optimal range
5000
Max safe ppm
20–40%
Growth increase

⚠️ Disclaimer: Educational only. Never exceed 5000 ppm (dangerous). Use CO2 monitors and alarms. Ensure proper ventilation. Not a substitute for professional grow room design.

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