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Calculate the exact plastic size and thickness for your greenhouse with our easy Greenhouse Plastic Calculator. Fast, accurate, and beginner-friendly tool.
Building a greenhouse is exciting, but choosing the right plastic size and thickness can be confusing. If you use too little, you’ll fall short. If you use too much, it becomes wasteful and costly. That's why we developed this Greenhouse Plastic Calculator — to help growers like you easily calculate how much greenhouse plastic you need, without guessing or measuring wrong.
Whether you’re growing vegetables, flowers, or starting seeds, using the correct size and type of plastic can make your greenhouse more efficient and longer-lasting.
To calculate the plastic needed, you need to know four basic dimensions of your greenhouse:
Once you have those, the formula depends on whether your greenhouse has rigid end walls (wood or metal) or flexible ends (plastic all around).
Top and Sides Plastic = Length × (Arch Span + Overlap Allowance)
This covers the entire structure including both ends in one continuous piece of plastic.
If your ends are separate, calculate each like this:
End Wall Plastic = (Height + 1 ft) × (End Width + 1 ft)
Add 1 foot on each side to allow space for securing the plastic.
The best plastic thickness depends on your climate and usage:
If you're not sure, go with 6 mil. It offers a good balance between price, strength, and lifespan.
6 mil greenhouse plastic can last up to 4 years if it’s UV-treated and properly installed. Without UV treatment, it may degrade in just 1–2 years under strong sunlight.
Yes, 4 mil plastic will work, but only for temporary or seasonal greenhouses. It’s not strong enough for year-round use or harsh weather. If you want lasting performance, especially through winter or strong sun, go with 6 mil or thicker.
Using our online tool is simple. Just follow these steps:
The calculator will show you the:
You can now confidently buy the exact amount of greenhouse plastic with no waste.
Choosing the right greenhouse plastic doesn’t have to be a headache. With the Greenhouse Plastic Calculator, you can save time, money, and avoid mistakes. It helps you plan better and ensures your plants stay protected year-round.
Don’t just guess your measurements. Use the calculator and get your project started the smart way. Whether you're building a small backyard hoop house or a large commercial tunnel, this tool makes the process faster and easier.
Yes, it works best for tunnel, hoop, and standard arched greenhouses. For domes or custom shapes, manual adjustments may be needed.
No problem. Just choose "metric" as your unit, and the calculator handles the rest.
With rigid ends: 20 × (10 + 3) = 20 × 13 = 260 sq ft, plus end wall plastic if needed.
No, but we recommend buying plastic labeled as "UV-stabilized" for better durability.
You can buy it from gardening stores, hardware outlets, or online from sites like Amazon or greenhouse suppliers.