Grow Room Cost Calculator

Different people grow marijuana either outdoors or indoors for varying reasons. Some grow the crop for recreational purposes while others cultivate it for its medicinal values. You will also come across people who grow the plant because they do not like the quality they get out there in the market, while some grow weed because of the high cost of buying it elsewhere.

Whatever the reason, when you start a weed grow room, you have to take into consideration the initial installation, alongside maintenance, and long-term operating costs. It is only through carrying out a weed grow room cost calculation that you can ensure your plants grow with everything they need without shortages caused by capital deficits in between different stages of marijuana growth. The pre-calculated  costs also help provide you with the profits to expect if you are growing weed for commercial purposes.

Grow Room Cost Calculator

Grow room cost calculation helps you to manage your marijuana gardening operations with ease, without much guesswork. First-time weed growers find it even more stringent when it comes to estimating how much they need to start their weed cultivation journey.

To find out more about what to expect from your grow room cost calculation, continue reading.

How Much Does It Cost To Grow Weed?

Contrary to what some people think, growing marijuana indoors is easy as long as you put enough effort into the process. If you chose to grow weed for your personal use, you do not need to start with many plants. Unlike growing the crop outdoors, growing the same indoors requires equipment, more monitoring, and more effort.

Even though you require more costs to grow weed indoors, it does not mean that it is an expensive venture, especially if you are starting with a few plants for your own personal use. How much you use depends on the number of plants but, with at least $80, you can set the ball rolling for high yields.

The total cost for a single plant will be anything between $250 and $300, while five plants will need a minimum of $400 in total cost. Growing a single plant is not economically viable, which is it is advisable to start with at least three to five plants. To help you understand the cost of the process, here is a breakdown of the equipment you will need.

Grow Room Cost Calculator


Before you find out how much the essential equipment you need for your indoor growing, you have to be sure about the amount of weed and type of strain you intend to plant. Knowing this will, make it easier to understand all the resources you will accumulate throughout the growing process. Follow the approximate costs of all the essential equipment below.


Knowing the actual seeds, you intend to plant is the first step to successful costing and growing. The costs of the seeds vary from one strain to the next one, but the prices are moderate. You can choose to buy seeds from other weed growers or reputable online seed banks. If you decide to go with the seed banks, you cannot buy just a single grain as they come in packs of a minimum of five seeds. Depending on the strain and potency, a package of five seeds sells for between $40 and $100.

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When you choose your seeds and the growing medium, the next step is to get soil because the seeds need germination and growth. Using ordinary soil from your backward may not give you healthy plants. Weed needs soil rich in nutrients for successful growth.

The best soil to buy is potting soil, which comes with all the nutrients your seeds need for germination, growth, and high yields. A single marijuana plant requires a 20-pound bag of fertile potting soil, depending on soil quality and brand. A 20-pound bag will cost you anything between $10 and $30. You can also get away with using $15 worth of potting soil per plant.

Grow Tent

A grow tent is one of the most convenient weed growing spaces for indoor growers. The majority of the grow tents come with specifications and features such as reflective materials that suit indoor weed growing and easy assembly. They come in different sizes ranging from the smallest measuring 2×2, which is the perfect size for beginners. A 2×2 tent can accommodate three plants with ease.

A 3×3 is also another great size for beginners, and it can accommodate up to four plants. 2×2 averages between $75 and $120 depending on the brand and materials used for construction. A 3×3 grow tent averages between $150 and $190 depending on the materials used and brand name.

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Green hut Grow Tent 96'X48'X78' 600D Mylar Hydroponic Indoor Grow Tent with Observation Window, Removable Floor Tray and Tool Bag for Indoor Plant Growing 8X4
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Green hut Grow Tent 96"X48"X78" 600D Mylar Hydroponic Indoor Grow Tent with Observation Window, Removable Floor Tray and Tool Bag for Indoor Plant Growing 8X4
  • HIGHLY REFLECTIVE — The grow tent includes a removable Mylar floor tray, and a 100% light-proof, tear-proof reflective Mylar lining to assist your indoor growing light fixtures and equipment. Increase the intensity of your grow lights and retain heat to keep your grow room at the right temperature for your plants, herbs, flowers, fruits, and vegetables to thrive
  • STURDY FRAME& EXTRA-THICK MATERIAL— Heavy duty all steel poles which are rated to handle at least 110 lbs. The frame is specially finished to ensure smooth installation and safe handling.The top-quality 600D Mylar is tear proof and double stitched for perfect light blocking
  • LIGHT PROOF — The large heavy duty Zippers & 1.5" ribbon protect the tent from light leaking and ensure durability and long-lasting use. Let you control the climate and lighting so you can grow any plant in any place safely and easily
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Ohuhu 48"x 24"x 60" Mylar Hydroponic Grow Tent with Observation Window, Floor Tray & Tool Bag, 2'x4' Plant Growing Tent with Durable 600D Oxford Cover for Indoor Plant Growing, Gardening & Germination
  • Gorgeous Ventilation: With the large zippered door and a Velcro side window, you can keep an eye on your grows at all hours and regulate external airflow to keep the plants warm and provide better air circulation for the seed germination and flowering period in indoor gardening horticulture, and helps to extend plant growing seasons
  • Highly Reflective: Comes with heavy-duty metal zippers, double stitching and 98%-reflective Mylar lining, blocking light from escaping and retaining heat while with the use of plant grow light inside, letting your plants make high-efficiency use of growing light source to promote the growth
  • Extra-Thick Canvas: Ohuhu 24” (W) x 48” (L) x 60” (H) hydroponics indoor growing tent constructed with heavy-duty 600D oxford cloth, tear proof & waterproof canvas. Keep your plants contained, prevent odors from leaking out, and stop unwanted critters from getting in
  • Easy Assembly: Ohuhu plant tents are easy to install even if you've never done something like this before. Parts come labeled with letters for ease in assembly. No tools needed, just make sure all the rubber feet are going the same direction. The hydroponic growing room is also easy to dissemble for clean-up or relocation
  • Rock-solid Stability: Structured with heavy-duty rust-resistant tubes for extended durability, the Ohuhu Grow Tent is strong enough to hold seed trays, pots and plant growth light, perfect for your plants, herbs, flowers, fruits and vegetables to thrive even in winter


The other items that you should include in your grow cost calculator are the nutrients and fertilizer. Both nutrients and fertilizers help to facilitate the weed’s healthy growth. One of the critical facts to consider while costing for the two essentials is that you cannot get them in single-plant sizes. Liquid nutrients, irrespective of the brand come in bottles with each servicing 12 plants and more.

Marijuana plants go through different growth stages, which means you will have to buy a different type of nutrient for each step. The main two stages are the flowering and vegetative phases. The liquid nutrient you will need for both stages will cost you anything between $20 and $30. If you buy two sets of nutrients, you will spend anything between $40 and $60 depending on quality and brand. Howmuch you will spend on five or more cannabis plants, is as follows.

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The lighting system is one of the essential equipment for indoor weed growing. It is also one of the items that you will need to put aside a sizeable amount of money during your grow room cost calculator. Marijuana plants thrive well in a certain kind of light that mimics the natural sun’s light.

The light you use should have lots of lumen output for the proper growth of the plants. Some beginners save money on lighting by using the typical incandescent bulbs. Still, the results are not favorable because they are not strong enough to provide the plants with enough light spectrums.

A better option would be a single fluorescent bulb for each plant in your grow tent. A single fluorescent bulb with its fixtures costs around $40. If you do not want to buy a single fluorescent bulb for each plant, you can purchase a long fluorescent tube setup with light tubes and a mount for setting it up. A decent fluorescent tube setup will cost you around $75, and you can use it on three or more weed plants.

You can also opt for HID grow light with a better quality lighting spectrum than the fluorescent tubes. A single HID bulb will cost you anything from $30, depending on the brand. Considering that you will need to buy the bulb with fixtures, you may spend $40 or more, again, depending on the brand.

If you have more than five plants in your grow tent, you may need a more powerful LED grow light setup that may cost you anything between $100 and $350 depending on the quality, brand, and the amount of light the plants need.

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If you choose to use a hydroponics setup to grow weed, you should prepare to spend more money than you would use with soil. How much you pay will depend on the system that you choose, the growing medium such as Coco Coir or Rockwool, the brand, and the number of crops. If you are a beginner, start by investing in an affordable starter kit that comes with everything you need to manage your plants from the seeds to the harvest stage. For a cheap starter kit, you will need anything between $200 and $250.

Carbon Filters

If you do not have a large grow tent or many crops, you do not need carbon filters. However, if you have more than five plants in the grow room, a carbon filter is necessary as it helps to eliminate the pungent marijuana smells by cleaning the air. A quality carbon filter with a duct fan will cost you around $300. You will also need clip fans to go with the carbon filter to help keep the grow tent efficiently closed for better circulation of air. Clip fans will cost you around $30.

Temperature Control and Ventilation

Controlling the temperature in your grow room and ensuring that there is a free flow of air is another essential consideration when you are doing your grow room cost calculation. You will need high quality and accurate thermometer, a humidity monitor, and a fan for this. For a precise thermometer and humidity monitor, you will need to spend anything between $30 and $60.

If you are planting less than five crops, you may opt to buy a cheap fan that will costyou anything between $25 and $30. If you have five or more plants, you may need a higher quality air fan that may cost anything between $50 and $75. It is good to invest in a quality fan for the best ventilation bearing in mind that the fan will serve the crops through their growing stages, which may last anything from 4 to 8 months. Therefore, the total cost for temperature control and ventilation will cost you between $25 and $75.

Labor Costs

How much you spend on labor for growing your marijuana indoors will depend on the number of employees and hours worked per day. If you are a beginner, you will not need to take on another person to carry out the cultivation process. With or without extra labor, when you are carrying out your growth room cost calculation, you should set aside around $20 per day, which is equivalent to $1,400 for a 10-week growth phase.

Cost Estimates of Growing Cannabis Outdoors

Growing cannabis outdoors has one significant advantage over indoor growing. It is cheaper and more relaxed because most of the essentials you need to develop the plants from the seed to harvest stage are free. Some of the free essentials include lighting, which the plants get directly from the sun, water from rain, and fertile soil with natural nutrients. The essential things you will probably use when growing weed outdoors are the seeds, maybe new soil, nutrients, and a container for water.

The seeds will cost you anything between $30 and $100 depending on the amount you need, the strain, and the period they take until harvest time. A quality 15-gallon container will cost you anything between $9 and $12; while any other grow, soil will cost you anything between $12 and $15. Actually, with just $55, you are good to go with growing cannabis outdoors.

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First-time weed growers do not have it easy to carry out marijuana grow room cost calculations on what they need for their journey. Growing the same outdoors comes with so much because all the essentials are free. If you are venturing into marijuana cultivation, you can plant five crops outdoors with just $150 or a figure, which is much lower than that, depending on the seed strains you choose, and your locality.

However, if you are doing the cultivation indoors, you will have to invest in more essentials that will cost much more than you would use if you were growing outdoors. Assuming that your starting number of weed plants is five, you will need anything between $400 and $450, for a successful harvest.

If you decide to start with one single crop, you should do a cost calculation of a minimum of between $250 and $300. It is, therefore, more economically viable to start with five crops because the cost difference is minimal. You also get more yields for almost the same cost if you start with five plants instead of a single crop.

I hope this article gives you an idea of how much you need if you are planning to invest in indoor weed growing.

In case you have any comments or questions to ask regarding this article, contact us by filling the form below and someone we will gladly respond.

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Bowden draws from over a decade of home growing experience as well as consulting for small-scale and hobbyist-level growers. He has written hundreds of articles, thought pieces, and tutorials about growing cannabis at home

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