What Size Tarp Do I Need? (Complete Sizing Guide)
Posted by CanopiesAndTarps on Mar 30th 2026
Choosing the right tarp size is one of the most important factors in getting proper coverage and protection. Whether you're covering equipment, building a shelter, or protecting materials outdoors, selecting the correct tarp size ensures better performance, durability, and ease of use.
In this guide, we’ll walk through how tarp sizes work, how to measure correctly, and how to choose the right size for your specific application.
Quick Answer: Choose a tarp at least 1–2 feet larger than your coverage area to allow for proper draping and secure tie-down.
Understanding Tarp Sizes: Cut Size vs Finished Size
One of the most common mistakes is assuming that a tarp’s listed size is its exact finished size.
- Cut Size: The size of the tarp before hemming
- Finished Size: The actual size after edges are folded and reinforced
Most tarps will finish approximately 3–6 inches smaller per side than the listed size. For example, a 10' x 20' tarp may measure closer to 9'6" x 19'6" when finished.
Step 1: Measure What You Need to Cover
Start by measuring the full area or object you want to cover. Be sure to account for all dimensions:
- Length: End to end coverage
- Width: Side to side coverage
- Height: If covering equipment or building a shelter
Always measure the widest and tallest points, including any protrusions like mirrors, handles, or stacked materials.
Step 2: Add Extra Material for Coverage
You should never choose a tarp that exactly matches your measurements. Always add extra material for proper coverage and secure tie-down.
- Add 12–24 inches per side for flat coverage
- Add 2–4 feet total if the tarp needs to drape over objects
- Add extra material for tie-down points and grommet use
This ensures the tarp can fully cover the object and remain secure in wind and weather.
Common Tarp Size Examples
| What You're Covering | Recommended Tarp Size |
|---|---|
| Small equipment or furniture | 8' x 10' or 10' x 12' |
| Motorcycles or ATVs | 10' x 12' or 12' x 16' |
| Cars or small trailers | 12' x 20' or larger |
| Large equipment or materials | 20' x 30' or larger |
Choosing the Right Tarp for Your Application
Size is only part of the equation. You also need the right material based on your use case:
- Poly Tarps: Lightweight, waterproof, and versatile for general use
- Vinyl Tarps: Heavier and more durable for long-term or commercial use
- Mesh Tarps: Allow airflow for shade and debris control
If you're unsure which material to choose, use our Tarp & Canopy Product Selector to compare options based on your needs.
Common Mistakes to Avoid
- Choosing a tarp that is exactly the same size as your object
- Forgetting to account for finished size vs cut size
- Not allowing enough material for tie-down and securing
- Using lightweight tarps for heavy-duty applications
Final Tip: When in Doubt, Size Up
If you're between sizes, it's almost always better to choose a slightly larger tarp. Extra material can be secured or folded, but a tarp that is too small will not provide proper coverage or protection.
Shop Tarps by Size and Use
Now that you know how to choose the right tarp size, browse our selection of heavy duty tarps to find the best fit for your project.
You can also explore specialized options like pond liner tarps or heavy-duty poly tarps for more demanding applications.