Fit Assistant
Measure once. Order with confidence.
Returns on doors are expensive and frustrating. Use our calculator to convert your rough opening into the right product from our catalog before you check out.
Find products that fit your opening
Enter your rough opening dimensions — the framed hole in the wall, not the existing door.
We add a standard frame allowance (2" width, 2.5" height) to compare against unit sizes. Most exterior doors use 36" × 80" units in a 38" × 82.5" rough opening.