Standard Size Measuring Guide

Standard Sizes: Check the Product’s Fit Specifications

For a ready-made product, measure the clear doorway opening from the inside left edge to the inside right edge, and from the top of the opening to the floor or threshold. Also check the flat frame space available for mounting.

Compare these measurements with the specific product’s fit door size, actual finished dimensions and installation requirements. Some models include extra frame coverage; others use different mounting systems. Do not apply a universal “add 1–2 inches” rule to every product, and do not assume that a nearby standard size will fit.

• Check both width and height, not just the width.
• Check clearance for handles, hinges, sliding panels and the threshold.
• For track models, check the required track mounting area.
• If the standard sizes do not match your opening and mounting space, consider a custom size.

Browse standard-size products   |   Explore custom sizes

Need help? Email your measurements, a full-frame photo and the product link to support@ifillis.com.

Ordering a made-to-order product instead? Use the custom measuring guide.