Door Size Calculator

DOORS v1.0

Standard door rough opening = door slab width + 2 in and door slab height + 2.5 in, the typical framing allowance for interior doors. Common interior door sizes: 24/28/30/32/36 in wide x 80 in tall; standard exterior doors: 36 in x 80 in.

Civil & Structural Engineering Tools

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Rough Opening Width
34 in
Rough Opening Height:82.5 in

Standard door rough opening = door slab width + 2 in and door slab height + 2.5 in, the typical framing allowance for interior doors. Common interior door sizes: 24/28/30/32/36 in wide x 80 in tall; standard exterior doors: 36 in x 80 in.

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Instrukcja krok po kroku

1

Enter Door Slab Size

Input the door slab width and height in inches (standard interior widths: 24, 28, 30, 32, 36 in at 80 in tall).

2

Apply Framing Allowance

The calculator adds the standard +2 in width and +2.5 in height framing allowance.

3

Get Rough Opening

View the rough opening dimensions to frame for.

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Immediate processing powered by your local device hardware with zero upload wait times.

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Pomoc i baza wiedzy

Najczęściej zadawane pytania (10)

Najczęstsze pytania i odpowiedzi dotyczące tego narzędzia.

A 32 in wide, 80 in tall door slab typically needs a rough framing opening of 34 in wide by 82.5 in tall.
Exterior doors often need a slightly larger allowance for the door frame and sill — always confirm with the specific door unit's installation instructions.
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