CO2 PPM Rise Calculator for Garden Grow Rooms

Estimate CO2 rise in garden grow rooms quickly. Plan dosing by flow or mass safely. Account for ventilation, mixing, and plant uptake every time.

Calculator inputs

Units

Length

Width

Height

Starting CO2 (ppm)

Target CO2 (ppm)

CO2 purity (%)

Air changes per hour

Mixing efficiency (%)

Plant uptake (ppm per hour)

Temperature (C)

Pressure (kPa)

Dosing method

Flow rate (L per minute)

Dose duration (minutes)

CO2 mass released (grams)

Reset

Example data table

Room (m)	Start to Target (ppm)	Dose	Air changes	Typical net rise
4 x 3 x 2.5	450 to 1200	3 L/min for 10 min	0.5	About 480 to 520 ppm
3 x 3 x 2.2	500 to 1000	2 L/min for 8 min	1.0	About 240 to 300 ppm
2 x 2 x 2.2	420 to 900	250 g mass release	0.3	About 650 to 750 ppm

Formula used

Room volume
Volume = Length x Width x Height

PPM rise
Delta ppm = (Pure CO2 liters / Room liters) x 1,000,000

Purity
Pure CO2 liters = Delivered liters x purity fraction

Ventilation loss
Retained fraction = exp( - air changes x hours )

Mass to volume
PV = nRT with n = mass / 44.01

How to use this calculator

Enter room dimensions and starting ppm.
Set a target ppm for your grow stage.
Select flow dosing or mass release.
Add ventilation and mixing for realistic results.
Press Calculate to show results above the form.
Use download buttons to save CSV or PDF.

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Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.