Add 6–12 inches on each side for securing/overlap if needed
For 3D Objects (e.g., machinery, trailers):
Top Measurement : Length x Width of the top
Side Drape : Decide how far down the tarp should hang
Add side drape to each side:
Total tarp length = Top length + 2 × Drape
Total tarp width = Top width + 2 × Drape
📌 Example : If you have a machine 6’L x 4’W and want 1.5’ side coverage:
Order a tarp ~9’L x 7’W
Step 2: Identify Your Purpose
Step 3: Understand Cut Size vs. Finished Size
Most tarps are sold as cut size , which is the pre-hemmed dimension. After hemming, tarps are usually 3–5% smaller , or up to 6–12 inches less than labeled.
✅ Sara Glove Tip: Always round up to the next size and allow for shrinkage or loss in hemming—especially for custom fits.
Step 4: Consider Fittings & Accessories
To ensure your tarp functions well:
Grommets
Look for tarps with grommets spaced every 18–36 inches
For extra hold, you can install additional grommets yourself
Ropes/Straps
Most tarps do not come with ropes
Choose ratchet straps for heavy-duty use, or simple rope/bungee cords for lightweight covers
Extras
Consider pockets for poles, zippers for enclosures, or Velcro flaps for added usability
Step 5: Choose the Right Material
Not all tarps are created equal! Whether you need something breathable, waterproof, lightweight, or ultra-durable, selecting the right material is just as important as picking the right size. From poly to vinyl , canvas , and beyond—each has its own strengths based on your use case.