Greenhouse Size Calculator

Greenhouse Size Calculator

Greenhouse Size Calculator




How do you calculate the size of greenhouse film?

To calculate the size of greenhouse film, measure the length and width of the greenhouse, including any extra height or sidewalls. Add an overlap of around 6 to 12 inches on each side for secure attachment. Calculate the total area by multiplying the total length (including overlap) by the total width (including overlap). Consider multiple layers by multiplying the total area by the number of layers required.


To calculate the size of greenhouse film, you need to consider the dimensions of the greenhouse structure. Here’s a step-by-step guide:

  1. Measure the length and width of the greenhouse: Use a tape measure to determine the length and width of the greenhouse’s base. Measure from one end to the other, considering the outer dimensions of the structure.
  2. Account for the sides and height: If your greenhouse has sidewalls or additional height, measure those dimensions as well. Take note of any extra length or height that needs to be covered by the film.
  3. Add the overlap: To ensure proper coverage and secure attachment, it’s recommended to include an overlap of film along the edges. This will allow you to secure the film in place using clips or other fasteners. The typical overlap is around 6 to 12 inches (15 to 30 cm) on each side.
  4. Calculate the total area: Once you have all the necessary measurements, calculate the total area of the film needed. To do this, multiply the total length (including the overlap) by the total width (including the overlap).Total area = (Length + 2 × overlap) × (Width + 2 × overlap)
  5. Consider multiple layers: If you plan to use multiple layers of greenhouse film for insulation or other purposes, multiply the total area by the number of layers required.Total area for multiple layers = Total area × Number of layers

Remember, these calculations provide an estimate of the greenhouse film size needed. It’s advisable to round up to the nearest size available or consult with a professional supplier who can guide you in selecting the appropriate size of greenhouse film for your specific needs.

How do I measure a greenhouse for plastic?

To measure a greenhouse for plastic, measure the width and length using a measuring tape. If there are multiple sections, measure each one separately. Consider the height or sidewalls if necessary. Calculate the surface area by multiplying the width and length. Add extra for overlap. Purchase plastic with the appropriate dimensions.


To measure a greenhouse for plastic, you will need to determine the dimensions of the structure. Here’s a step-by-step guide on how to measure a greenhouse for plastic covering:

  1. Gather the necessary tools: You will need a measuring tape or a measuring wheel, a pen or pencil, and paper or a notebook to record your measurements.
  2. Start with the width: Measure the width of the greenhouse by stretching the measuring tape from one side of the structure to the other. If the greenhouse has multiple sections, measure each section separately. Write down the width measurement.
  3. Move on to the length: Measure the length of the greenhouse by running the measuring tape along one side of the structure from end to end. Again, if the greenhouse has multiple sections, measure each one separately. Record the length measurement.
  4. Account for height or sidewalls: If your greenhouse has sidewalls or a particular height that needs to be covered with plastic, measure the height from the ground to the desired level. This measurement will help you determine the vertical coverage needed.
  5. Calculate the surface area: Multiply the width by the length of each section to calculate the surface area to be covered with plastic. If you have multiple sections, repeat this calculation for each section and add the results together to get the total surface area.
  6. Consider overlapping and excess: When purchasing plastic covering, it’s advisable to account for some extra material for overlapping and potential shrinkage. Adding 10-15% to the total surface area is a good rule of thumb to ensure you have enough plastic to cover the greenhouse adequately.
  7. Determine the plastic dimensions: Plastic covering usually comes in rolls of various widths. Choose a width that is wider than the width of your greenhouse. This will allow you to have enough material to cover the entire width without any gaps. The length of the plastic will depend on the total surface area you calculated earlier.
  8. Purchase the plastic: Armed with the measurements, visit a greenhouse supply store or search online for plastic covering options. Select the appropriate width and length based on your measurements and the extra allowance you added.
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By following these steps, you should be able to accurately measure your greenhouse and determine the dimensions of the plastic covering you’ll need.

How many square feet is a greenhouse?


The size of a greenhouse can vary significantly depending on its purpose, design, and the available space. Greenhouses can range from small backyard structures to large commercial operations. Therefore, it’s difficult to provide a specific answer without additional information.

To give you an idea of the range of sizes, small hobbyist greenhouses can be as small as 100 square feet or less. These are typically used for growing a limited number of plants or starting seeds. On the other end of the spectrum, large commercial greenhouses can span several acres and cover thousands or even tens of thousands of square feet.

If you have a specific greenhouse in mind or if you can provide more details about its purpose or dimensions, I can try to give you a more precise estimate.

How much air circulation does a greenhouse need?


The amount of air circulation required in a greenhouse depends on various factors, including the size of the greenhouse, the types of plants being grown, the climate conditions, and the specific ventilation system used. However, providing adequate air circulation is crucial for maintaining a healthy greenhouse environment.

Here are a few general guidelines for greenhouse air circulation:

  1. Ventilation: Greenhouses typically have vents or windows that can be opened to allow fresh air to enter and stale air to exit. The size and number of vents depend on the greenhouse size and the plants being cultivated. A rule of thumb is to provide enough vents to achieve a complete air exchange within the greenhouse every 1-2 minutes. However, this can vary based on local climate conditions and plant requirements.
  2. Fans: Circulating fans can be used to improve air movement within the greenhouse. They help in distributing heat, reducing humidity levels, preventing stagnant air pockets, and minimizing pest and disease issues. The number and size of fans needed will depend on the greenhouse size and layout. It’s recommended to have fans strategically placed to ensure even airflow throughout the growing area.
  3. Natural airflow: In addition to mechanical ventilation, utilizing natural airflow is beneficial. Consider the prevailing wind direction and design the greenhouse layout to take advantage of cross-ventilation. This can be achieved by positioning vents and windows on opposite sides of the greenhouse to facilitate air movement.
  4. Environmental controls: Modern greenhouse systems often include environmental controls that regulate temperature, humidity, and air circulation. These controls can automatically adjust ventilation, fans, and other mechanisms to maintain optimal growing conditions.

It’s important to note that specific plant requirements may vary, and some plants might have specific needs for air circulation, temperature, or humidity. Therefore, it’s recommended to research the specific needs of the plants you plan to grow and consult local experts or agricultural extension services for guidance tailored to your specific situation.

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Is green plastic or clear plastic better for a greenhouse?


The choice between green plastic or clear plastic for a greenhouse primarily depends on the specific needs and goals of the greenhouse operation. Each type of plastic has its advantages and considerations.

Clear Plastic:

  1. Light Transmission: Clear plastic allows a higher percentage of sunlight to pass through, maximizing the amount of natural light available for plant growth. This can be beneficial, especially in regions with limited sunlight or during the winter months when daylight is reduced.
  2. Temperature Control: Clear plastic allows for better solar heat gain, which can help in maintaining higher temperatures inside the greenhouse. This can be advantageous in cooler climates or during the colder seasons, as it promotes a warmer environment for the plants.
  3. Visibility: Clear plastic provides greater visibility both from inside and outside the greenhouse. This can be useful for monitoring plant growth, inspecting for pests or diseases, and overall greenhouse management.

Green Plastic:

  1. Light Diffusion: Green plastic diffuses sunlight, scattering it more evenly throughout the greenhouse. This helps to reduce the intensity of direct sunlight and minimize the risk of plant sunburn or heat stress. It also helps to prevent shadows from falling on plants, ensuring more uniform light distribution.
  2. Temperature Regulation: Green plastic reduces solar heat gain compared to clear plastic. This can be advantageous in warmer climates or during the summer months when excessive heat buildup inside the greenhouse is a concern. The reduced heat transmission can help in maintaining cooler temperatures.
  3. Pest Management: Green plastic can provide some level of pest management by making it more difficult for certain insect pests to locate the plants. The green color can create a visual barrier that interferes with their ability to detect and target the crops.

It’s important to note that the specific type and quality of the plastic used can also influence its performance in terms of light transmission, durability, and insulation properties. Additionally, factors such as climate, crop type, and personal preferences should be considered when choosing between green and clear plastic. Consulting with local experts or experienced greenhouse operators can provide valuable insights tailored to your specific situation.

Is 4 mil plastic thick enough for greenhouse?


When it comes to plastic thickness for greenhouses, 4 mil (or 4 millimeters) is generally considered relatively thin. While it may be suitable for some applications, it may not provide optimal durability or insulation compared to thicker materials.

Greenhouse plastic thickness is typically measured in mils (thousandths of an inch) or millimeters. The appropriate thickness depends on factors such as the greenhouse’s size, location, desired insulation properties, and local climate conditions.

Thicker plastic films, such as 6 mil (0.006 inches or 0.15 mm) or 8 mil (0.008 inches or 0.2 mm), are commonly used for greenhouse coverings. These thicker materials offer improved durability and insulation, providing better protection against environmental factors such as wind, temperature fluctuations, and UV radiation.

If you decide to use 4 mil plastic, keep in mind that it may be more susceptible to tearing or damage, especially in areas with high winds or severe weather conditions. However, if you live in a relatively mild climate with minimal wind exposure, 4 mil plastic could still be a viable option for a temporary or less demanding greenhouse setup.

Ultimately, it’s important to consider the specific requirements of your greenhouse project and assess the environmental factors in your area to determine the appropriate plastic thickness for your needs. Consulting with local experts or professionals in greenhouse construction could also provide valuable insights and recommendations.

How long does plastic sheeting last in a greenhouse?


The lifespan of plastic sheeting in a greenhouse can vary depending on various factors such as the quality of the material, the environmental conditions, and the maintenance practices. Typically, greenhouse plastic sheeting is designed to last for a certain number of seasons or years.

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Standard greenhouse polyethylene film, which is commonly used, usually has a lifespan of around 2 to 5 years. However, this can vary based on the specific grade of plastic used. There are different grades available, ranging from economical options with shorter lifespans to more durable, long-lasting options. It’s essential to choose a high-quality plastic sheeting specifically designed for greenhouse use to maximize its longevity.

Environmental conditions play a significant role in the deterioration of plastic sheeting. Ultraviolet (UV) radiation from the sun can degrade plastic over time, leading to brittleness and discoloration. Exposure to extreme temperatures, including both cold and hot conditions, can also affect the lifespan of the material.

Proper maintenance and care can help extend the life of the plastic sheeting. Regular cleaning, removing debris, and avoiding excessive stress on the material can contribute to its longevity. Additionally, some greenhouse operators choose to apply UV-resistant coatings or films to protect the plastic from sun damage and prolong its lifespan.

Ultimately, it’s recommended to consult the manufacturer or supplier of the specific plastic sheeting you plan to use, as they can provide more precise information about the expected lifespan based on their product’s characteristics and usage guidelines.

What is the cheapest way to cover a greenhouse?


The cheapest way to cover a greenhouse typically involves using plastic sheeting or film. Polyethylene plastic film is commonly used for greenhouse coverings due to its affordability. It is available in various thicknesses and grades, offering options for different budgets.

When considering the cost, it’s important to balance it with the durability and lifespan of the material. Cheaper plastic sheeting may have a shorter lifespan and may need to be replaced more frequently, which can incur additional costs over time. It’s worth considering investing in a slightly higher quality plastic film that offers better durability and UV resistance, as it may last longer and provide better value in the long run.

Another cost-effective option for covering a greenhouse is using recycled or salvaged materials. For instance, you could repurpose old windows, glass doors, or even clear plastic bottles to create a covering for your greenhouse. This approach may require more effort and creativity, but it can be an inexpensive way to cover a greenhouse while also utilizing recycled materials.

Additionally, you could explore local resources such as agricultural supply stores, garden centers, or online marketplaces to compare prices and find affordable options for greenhouse coverings. It’s advisable to consider the specific requirements of your greenhouse, such as light transmission, insulation, and weather resistance, while selecting the most cost-effective covering material.

Remember that while opting for a cheaper covering may save you money initially, it’s crucial to assess the long-term costs and durability of the material to ensure it meets your needs and provides adequate protection for your plants.

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