Calculate Measurements for Your Accordion Boot - Online Calculator
Use these online calculator tools to help you determine how much boot material you need. Please use this as guideline for the amount of boot material you require for your project. Always keep in mind that you should verify these amounts to insure that your order is processed properly.
Now that you have your circle measurement, go here to place your rubber boot material order.
Now that you have your rectangle measurement, go here to place your rubber boot material order.
Now that you have your trapezoid measurement, go here to place your rubber boot material order.
Why Accurate Measurement Matters
For a tight seal, the accordion boot must exactly match your opening perimeter. Too short means gaps; too long adds unnecessary trimming and seam overlap. Our tool helps calculate circumference for circular, rectangular, or trapezoid-shaped openings to ensure a proper fit.
How to Measure Your Opening
Decide the shape: circle, rectangle, or trapezoid.
Use flexible tape to measure sides or diameter in inches.
Include extra overlap: add 1–2 inches for trimming or seam.
Submit your measurements and receive an estimate in feet.
Example Use Cases
Fullsize pickup rear window: most measure around 13–14 feet circumference.
Mini truck openings: typically around 10 feet total.
Custom pass-throughs and trapezoid openings: maybe shorter but require precise angles.
Tips & Troubleshooting
Always round up and add overlap to avoid shortage.
Remove glass or slider windows before measuring or installing.
Cold weather makes EPDM rubber stiffer—warm before bending.
Avoid overly tight corners—accordion boots flex best when corners have at least a 1″ radius.
Frequently Asked Questions
How many feet of material do I need?
Use the calculator to find how much you need. Every installation is different so you will need to measure.
Do I need glue to install?
No—spring clips hold the boot in place. Glue (cyanoacrylate) is optional when overlapping ends for a weather-tight seal.
Can I save material by underestimating?
We recommend adding extra 1–2 inches rather than risk running short. Always round your calculated feet upward.
Next Steps
- Enter your measurements using the calculator above.
- Write down your results you will need this number when placing your order.
- Need help? Contact us for assistance or request a sample pack.