8 Best Free Online CO2 Grow Room Calculator Websites

Here is a list of the best free online CO2 Grow Room Calculator websites. A grow room is an indoor space designed for cultivating plants. It is often used for growing crops like cannabis, herbs, or vegetables. A grow room provides controlled environmental conditions, including lighting, temperature, and humidity, to optimize plant growth.

CO2 is crucial for plants’ growth which needs to be regulated in a grow room. The ideal CO2 level in a grow room typically ranges from 1,000 to 1,500 parts per million (ppm) during the daytime. However, CO2 levels should be lowered to around 400-600 ppm during the nighttime to avoid waste and potential issues. A CO2 source (generator or tank), a regulator, and a distribution system are required to regular and monitor the CO2 level.

A CO2 Grow Room Calculator helps you determine the CO2 flow rate of the generator to keep the ideal CO2 quantity in the grow room. You can provide the required CO2 level along with the current CO2 level and the calculator gives you the flow rate you should set in your generator. Whether your CO2 generator runs continually or minutes per hour, you can factor that in and perform the calculation. This post covers 8 such online calculators where you can perform your grow room CO2 calculations with ease.

My Favorite Online CO2 Grow Room Calculator

OnmiCalculator.com is my favorite website on this list for grow room CO2 calculation. The calculator on this website simplifies everything into a neat and organized interface. Based on the room and requirements, you can easily calculate parameters such as area, volume, and required CO2 level. In the end, you can determine the CO2 flow rate to fill the room in a given time. You can also calculate the time it will to reach the required CO2 level at a certain CO2 flow rate.

You can check out our other lists of the best free Online Plant Spacing Calculator Websites, Online Carbon Footprint Calculator Websites, and Farm Management Software For Windows.

Comparison Table:

Name	Calculates	Generator on Time	Unit System
OmniCalculator.com	CO2 Flow rate / On time	total	Multiple
HawthorneGC.com	CO2 Flow rate	mins per hour	Metric/Imperial
HydroBuilder.com	CO2 Flow rate	mins per hour	Metric/Imperial
AtlantisHydroponics.com	CO2 generator on tIme	total	Imperial
HydrotekHydroponics.com	CO2 generator on tIme	mins per hour	Imperial
HydroFarm.com	CO2 Flow rate	total / mins per hour	Imperial
HappyHydro.com	CO2 Flow rate	mins per hour	Imperial
Hydroponics.eu	CO2 Flow rate	-	Metric

OmniCalculator.com

OmniCalculator.com has a free online CO2 Grow Room Calculator that can help you determine how much CO2 to add to the grow room. This calculator has three sections:

• Grow room dimensions: Here you have to provide the dimensions of the room. The calculator determines the area and volume from the dimensions. If you know the area and volume then you can add those details directly and skip the dimensions.
• CO2 levels: This section covers the current CO2 level and Target CO2 level. Based on that, it determines the Required CO2 amount.
• CO2 tank: This section contains two parameters; CO2 flow rate and Time. With both previous sections filled, you can provide any of these parameters to calculate the other.

This calculator can help you calculate the amount of time it will take to reach the required CO2 level for a given CO2 flow rate. And if you have to fill the CO2 in a certain amount of time then you can add that time and determine the required CO2 flow rate to fill in the room within that time span. It is a versatile calculator that can be used to find any missing parameter. For example, if you add CO2 flow rate and time, you can calculate required CO2 and so on.

How to calculate grow room CO2 flow rate or time using this calculator?

• Head over to this calculator on the OmniCalculator website. A direct link is mentioned below.
• Add the room dimensions by selecting the correct unit to determine the Area and Volume. Alternatively, you can provide the Area and Volume skipping the dimensions.
• In the CO2 levels section, provide the Current CO2 and Target CO2 to get the Required CO2.
• Then in the CO2 tank section, add the Time to get the CO2 flow rate. Or, add the CO2 flow rate to get the Time.

Highlights:

• Calculates for: CO2 flow rate or time.
• Room Dimensions: Calculates Area and Volume from room dimensions. Also supports Area and Volume direct input.
• CO2 Levels: Calculates the Required CO2 amount for the Current CO2 level and Required CO2 level.
• Output: CO2 flow rate for a given time period and Time required to pump in required CO2 for a given CO2 flow rate.

HawthorneGC.com

Hawthorne Gardening Company is a supplier of horticulture, organics, hydroponics, and lighting supplies. They offer a wide range of products from leading brand names such as Gavita, General Hydroponics, and Sun System. Their website features calculators and online tools related to hydroponics horticulture. It has a CO2 Flow Calculator that you can use to determine the CO2 flow rate to reach the required CO2 level in a grow room. At the top, the calculator lets you pick between the metric and imperial unit system for the calculation. After that, the calculator asks for the room dimensions covering the length, width, and height. When you add the dimensions, it calculates the area and volume of the room and shows that alongside. Next is the CO2 levels. This part of the calculator has three sliders to set the ambient CO2 level, required CO2 level, and CO2 generator on time in minutes per hour. You can configure these levels accordingly and get the CO2 flow rate.

How to calculate grow room CO2 flow rate using this calculator?

• Open this CO2 Flow Calculator using the link provided below.
• Select between the Metric or Imperial unit system for the calculation.
• Set the room dimensions by adding Length, Width, and Height into the calculator.
• Configure the Ambient CO2 level, Target CO2 level, and on-time per hour.
• This gets you the CO2 Flow Rate in cubic meters per hour.

Highlights:

• Calculates for: CO2 flow rate of generator.
• Room Dimensions: Takes Length, Width, and Height to calculate Area and Volume.
• CO2 Levels: Ambient CO2 level, Target CO2 level, and CO2 generator on-time per hour.
• Output: CO2 flow rate for the given generator on time per hour.

HydroBuilder.com

HydroBuilder.com is an online retailer of hydroponics equipment and supplies. They offer a vast selection of products ranging from grow tents and lighting systems to nutrients and grow media. Their website has blogs that cover guides and tools for hydroponics farming. The website has a Grow Room CO2 Flow Calculator. This calculator is similar to the one you get on HawthorneGC.com. It calculates the CO2 flow rate in cubic feet per hour. To perform this calculator, you have to provide the room dimensions. You can go with the metric or imperial unit system for that. From the given room dimensions, the calculator first determines the area and volume. The next thing you need for the calculation is the CO2 levels. First, you have to set the current CO2 level of the room along with the target CO2 level. Then you get to configure the running time of the CO2 pump. You can set it to the desired minutes per hour. Based on all the inputs, the calculator gives you the CO2 flow rate in cubic feet per hour.

How to calculate grow room CO2 flow rate online using this calculator?

• Go to this online CO2 grow room calculator using the link given below.
• Pick between the Metric or Imperial unit system at the top.
• Then enter the room dimensions by adding Length, Width, and Height.
• After that, set the Ambient CO2 level, Target CO2 level, and on-time per hour using the respective sliders.
• This gets you the CO2 Flow Rate in cubic feet per hour.

Highlights:

• Calculates for: CO2 flow rate.
• Room Dimensions: Automatically calculates Area and Volume from Length, Width, and Height input.
• CO2 Levels: Ambient CO2 level, Target CO2 level, and CO2 generator on-time per hour.
• Output: CO2 flow rate for the given generator on time per hour.

AtlantisHydroponics.com

AtlantisHydroponics.com is another supplies and garden center located in Atlanta, Georgia. They also offer a wide range of hydroponic supplies and equipment for both indoor and outdoor gardening. Their website features a CO2 Calculator that calculates how much CO2 will be needed to fill a grow room to the optimum level. It also determines how long it will take to fill at the given rate. Just like any other calculator, you have to add the room dimensions for the area and volume. For CO2, the assumes that there is already about 300 PPM CO2 in the air. Thus you have to add how much more CO2 you need in the room. For example, if you need 1500 PPM then you have to add 1200 PPM in the calculator. Combined with the 300 PPM CO2 in the air, it gives you a total of 1500 PPM. Along with that, you also have to add your Flow meter setting or generator size in CFH (Cubic Feet per Hour). With these inputs, the calculator calculates the amount of CO2 required in cubic feet. Below that, it shows how much time it will take to reach the required CO2 level with your added flow setting or generator size.

How to calculate grow room CO2 requirements using this calculator?

• Follow the link given below to open this calculator in your browser.
• Enter the required input parameters covering Room dimensions, CO2 to add in PPM, and Flow meter setting or generator size in CFH.
• Then click the Calculate button to get the amount of CO2 Required (Cubic Feet) and CO2 generator on time.

Highlights:

• Calculates for: CO2 generator/tank on time.
• Room Dimensions: Calculates room area from dimensions.
• CO2 Levels: CO2 to add in PPM, Flow meter setting, or generator size in CFH.
• Output: On-time and CO2 Required in cubic feet.

HydrotekHydroponics.com

HydrotekHydroponics.com provides professional solutions, technical expertise, and industry experience to enable growers to be more productive and efficient. Their website offers a CO2 generator time calculator that you can use to calculate the CO2 generator running time to reach the required CO2 level. This calculator takes the room dimensions along with the power of BTU/hour of the CO2 generator. It assumes that there is 300 PPM CO2 in the air already and provides a slider to set the additional amount of CO2 (in PPM) that needs to be injected into the room. Based on that, the calculator calculates the required quantity of CO2 in cubic feet. Along with that, it also calculates the time that your CO2 generator must run (minutes/hours).

How to calculate grow room CO2 generator on time using this calculator?

• Open this calculator in your browser using the direct link given below.
• Add the room dimensions in feet along with the BTU/hour of the CO2 generator.
• Set the Quantity of CO2 to inject in the room using the respective slider.
• This gives you the required CO2 in cubic feet and generator on time.

Highlights:

• Calculates for: CO2 generator/tank on time and Required CO2 in cubic feet.
• Room Dimensions: Calculates room area from dimensions.
• CO2 Levels: BTU/hour of CO2 generator and Required CO2 quantity to inject.
• Output: Generator on-time and CO2 Required in cubic feet.

HydroFarm.com

HydroFarm.com is a distributor and manufacturer that offers a wide range of products, including high-intensity grow lights, climate control solutions, growing media, and more. The website features a CO₂ Flow Rate Calculator. This calculator works with the imperial unit system. It calculates the CO2 flow rate in cubic feet per hour and the amount of CO2 needed in cubic feet. For this calculation, the calculator needs the room dimensions and. amount of CO2 required (PPM), and on time for the generator. The on-time can be a continued time or minutes per hour. Based on the added input, the calculator gets you the CO2 flow rate in seconds.

How to calculate grow room CO2 flow rate online using this calculator?

• Head over to this online CO₂ Flow Rate Calculator using the link given below.
• Add the room dimensions by adding Length, Width, and Height in feet.
• After that, set the Desired CO2 level, Existing CO2 level, and the Time Duration.
• This gets you the CO2 Flow Rate in cubic feet per hour and the Amount of CO2 needed in cubic feet.

Highlights:

• Calculates for: CO2 flow rate and CO2 amount.
• Room Dimensions: Length, Width, and Height in feet.
• CO2 Levels: Desired CO2 level, Existing CO2 level, and the Time Duration.
• Output: CO2 flow rate in cubic feet per hour and Amount of CO2 needed in cubic feet.

HappyHydro.com

HappyHydro.com offers a wide range of products, including LED grow lights, complete grow kits, grow tents, fans, carbon filters, nutrients, and more. Their online CO2 Flow Rate Calculator can help you find the perfect CO2 flow rate for your grow room. The calculator is quite simple asking for room dimensions in feet. Along with that, it needs ambient CO2 level, target CO2 level, and on-time of the CO2 generator. The on-time should be in minutes per hour. With these inputs, the calculator gives you the CO2 flow rate in cubic feet per hour. It also calculates and shows the room area and volume.

How to calculate grow room CO2 flow rate online using this calculator?

• Follow the link given below to access this Co2 Calculator for Grow Rooms.
• Add the Length, Width, and Height in feet.
• Then fill in the
• After that, set the Ambient CO2 level, Target CO2 level, and on time.
• Click the Calculate button to get the CO2 Flow Rate in cubic feet per hour.

Highlights:

• Calculates for: CO2 flow rate.
• Room Dimensions: Room dimensions in feet to determine Area and Volume.
• CO2 Levels: Ambient CO2 level, Target CO2 level, and On-time (minutes per hour).
• Output: CO2 flow rate in cubic feet per hour.

Hydroponics.eu

Hydroponics.eu is a Europe-based hydroponics grow shop that offers a wide range of indoor gardening and hydroponic supplies. The website offers a free tool to calculate the ideal amount of CO2 for a grow room. The tool follows the metric unit system for the room dimensions. You can provide the room dimensions to the calculator along with the amount of CO2 needed to add to the room. The calculator first determines the room area and volume. After that, it calculates the flow setting in cubic meters per hour. This gives you the flow rate you have to set in your CO2 generator to achieve the required CO2 level in the room.

How to calculate grow room CO2 flow rate online using this calculator?

• Use the link provided below to open this calculator directly.
• Enter the room dimensions covering Length, Width, and Height in meters.
• Then set the amount of CO2 to add in PPM.
• After that, click the Calculate button to get the CO2 flow setting for the generator.

Highlights:

• Calculates for: CO2 flow rate.
• Room Dimensions: Room dimensions in meters.
• CO2 Levels: CO2 to add in PPM.
• Output: CO2 flow rate in cubic feet per hour.

Frequently Asked Questions