Grow Light Coverage Calculator
Enter the length of your grow space in feet.
Enter the width of your grow space in feet.
Select your grow light type for tailored recommendations.
Calculated as: Length × Width
Based on room area and light type.
Estimated light intensity for optimal growth.
Suggested distance from plants based on light type.
Enter the length of your tent.
Enter the width of your tent.
Enter the height of your tent.
Calculated as: Length × Width × Height
Number of air exchanges per hour.
Efficiency of your inline fan (as a decimal).
Select if you are supplementing CO₂.
Calculated as: (Room Volume × Air Exchange Rate) ÷ Fan Efficiency. Adjusted for CO₂ if needed.
Enter the wattage of your grow light.
Number of hours the light runs per day.
Cost per kilowatt-hour.
Calculated as: (Wattage × Hours ÷ 1000) × Rate
Approximate cost per month (daily cost × 30)
Approximate cost per year (daily cost × 365)
Created by James S. Lockwood
With a background in botany and ecological sciences, James specializes in creating practical tools and resources to help gardeners, farmers, and plant enthusiasts optimize their green spaces.
Are you struggling with your grow tent or indoor garden setup? Our all-in-one Grow Room Calculator helps you:
✅ Determine the perfect grow light wattage & coverage
✅ Calculate the right ventilation (CFM) for airflow control
✅ Estimate electricity costs for grow lights & optimize savings
✅ Adjust CO₂ levels to boost plant yield
🔹 Use this FREE calculator to maximize plant health, control climate, and reduce costs!
Why You Need Grow Light Coverage , Ventilation & Electricity Cost Calculator?
Creating the ideal growing environment is essential for plant health and higher yields. Light, airflow, and energy consumption are the three pillars of a successful indoor garden.
🔹 Lighting: Plants need the right intensity (PPFD) and wattage to grow efficiently.
🔹 Ventilation: Proper airflow prevents mold, balances humidity, and removes excess heat.
🔹 Electricity Costs: Indoor gardening can be expensive—optimize power consumption to save money.
This calculator eliminates guesswork and ensures your grow room is set up for success. You can use for Grow Room calculator to calculate VPD (Vapor Pressure Deficit), CO₂ levels, ventilation (CFM), grow light wattage, cooling needs (BTU), dehumidifier capacity, grow cost, and estimated yield
How to Use the Grow Light Coverage Calculator for Maximum Yield?
1️⃣ Enter your grow tent/room dimensions (Length, Width, Height).
2️⃣ Select your grow light type (LED, HPS, MH, Fluorescent).
3️⃣ Adjust your air exchange rate & fan efficiency.
4️⃣ Enter your electricity rate to calculate energy costs.
5️⃣ Get instant recommendations for lighting, ventilation & energy usage.
How Much Light Do Your Plants Need?
Grow lights mimic natural sunlight. Use this calculator to determine the right wattage and PPFD levels for each growth stage.
Recommended Wattage & PPFD (Light Intensity)
2x2 ft
💡 100-150W Recommended Wattage
🌱 400-600 PPFD (µmol/m²/s)
4x4 ft
💡 400-600W Recommended Wattage
🌱 600-900 PPFD (µmol/m²/s)
8x8 ft
💡 1,200-1,500W Recommended Wattage
🌱 900-1,200 PPFD (µmol/m²/s)
Grow Light Hanging Height Guide
LED
🌱 Seedling: 24-30"
🌿 Veg: 18-24"
🌸 Flower: 12-18"
HPS
🌱 Seedling: 36-48"
🌿 Veg: 24-36"
🌸 Flower: 18-24"
MH
🌱 Seedling: 24-30"
🌿 Veg: 18-24"
🌸 Flower: 12-18"
Fluorescent
🌱 Seedling: 18-24"
🌿 Veg: 18-24"
🌸 Flower: 18-24"
🔹 Ensure even light distribution for maximum plant health!
Why Ventilation is Important for Grow Rooms?
Ventilation ensures optimal air circulation, temperature control, and CO₂ levels. Without proper airflow, plants suffocate, overheat, or become moldy.
CFM (Cubic Feet per Minute) Calculation Formula
Grow Tent Ventilation Requirements
2x2x5 ft
🌬️ 50-100 CFM Recommended CFM
4x4x6 ft
🌬️ 200-250 CFM Recommended CFM
8x8x8 ft
🌬️ 500-700 CFM Recommended CFM
🔹 Choose a fan that meets or exceeds the required CFM for efficient air exchange.
CO₂ Supplementation & Its Impact on Ventilation
CO₂ is a growth booster but affects ventilation needs. Use this calculator to adjust CFM based on CO₂ levels.
CO₂ Ventilation Adjustment Chart
No CO₂
🌬️ 250 CFM Required CFM
CO₂ Enriched
🌬️ 150 CFM Required CFM
🟢 Pro Tip: Plants grow faster at 1200-1500 ppm CO₂ when air exchange is controlled.
How Much Does It Cost to Run Grow Lights?
Indoor gardening can increase electricity bills. Use this calculator to estimate your daily, monthly, and yearly costs.
Electricity Cost Formula
Grow Light Energy Cost Chart
LED
💡 600W Wattage
⏳ 18 hrs per Day
💰 $39.31 per Month
HPS
💡 1000W Wattage
⏳ 12 hrs per Day
💰 $43.20 per Month
🟢 Pro Tip: Switching to LED grow lights reduces electricity costs by 50%+.
Best Grow Lights for Your Indoor Garden
- LED Lights: Best for energy efficiency & full spectrum
- HPS Lights: High-intensity but consumes more power
- MH Lights: Ideal for vegetative growth
- Fluorescent Lights: Budget-friendly for seedlings
🟢 For best results, use LED lights for efficiency & long lifespan!
Best Ventilation Systems for Grow Tents
- Inline Fans: Ideal for air exchange
- Oscillating Fans: Improve air circulation
- Carbon Filters: Remove odors & control airflow
🔹 Get a fan that matches your CFM requirements!
Common Grow Room Mistakes & How to Avoid Them
✅ Wrong Light Wattage: Too much or too little affects growth
✅ Poor Ventilation: Leads to mold, weak plants, & heat stress
✅ High Electricity Costs: Optimize with LED & efficient airflow
✅ Ignoring CO₂ Levels: Impacts plant respiration & yield
🟢 Use our calculator to avoid these costly mistakes!
FAQs – Grow Room Lighting, Ventilation & Cost Calculator
❓ How do I calculate the right grow light wattage?
Multiply your grow area by the recommended PPFD levels.
❓ How often should I exchange the air in my grow tent?
Every 1-3 minutes to keep conditions optimal.
❓ What’s the ideal CFM for a 4×4 grow tent?
200-250 CFM for proper ventilation.
❓ Does CO₂ supplementation increase plant yield?
Yes! It boosts growth by up to 30% when controlled properly.
Disclaimer for Grow Light Coverage , Ventilation & Electricity Cost Calculator
This Grow Room Lighting, Ventilation & Electricity Cost Calculator is for informational purposes only. Results are estimates and should not replace professional advice. Factors such as room conditions, light efficiency, and local electricity rates may affect actual performance. Always consult a grow expert or electrician before making changes to your setup.
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