Can I change the assumptions?

Yes. Every major dimension, rate, allowance or conversion assumption is editable so the estimate can match the project.

Bifold Door Size Calculator

Estimate bifold door panel width and height from the finished opening, number of panels and desired installation clearances. Enter your own values to produce a transparent project-specific estimate.

Finished opening widthFinished opening heightNumber of panelsTotal side clearanceTotal top and bottom clearance

Fill in the required fields to see your result.

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Use the primary result for planning, then review the supporting outputs and assumptions before ordering materials or requesting quotes.

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How to Use This Calculator

Enter the requested project dimensions and assumptions. Review the intermediate outputs before using the final estimate.

Formula & Methodology

The calculator converts the entered dimensions and assumptions into the displayed quantities or costs using the formulas shown in the result breakdown.

Worked example

A 72-inch opening with four panels and 1 inch of total side clearance gives an approximate panel width of 17.75 inches.

Hardware systems use manufacturer-specific deductions. Always follow the selected track and pivot hardware instructions.

Planning estimate only. Verify dimensions, product data, local requirements and supplier or contractor pricing before purchasing or starting work.

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Frequently Asked Questions

What does the Bifold Door Size Calculator calculate?: Estimate bifold door panel width and height from the finished opening, number of panels and desired installation clearances.
Can I change the assumptions?: Yes. Every major dimension, rate, allowance or conversion assumption is editable so the estimate can match the project.
How accurate is the result?: Hardware systems use manufacturer-specific deductions. Always follow the selected track and pivot hardware instructions.

Last updated 8/1/2026