Window & Door Header Sizing Calculator | EZ Virtual Tools Construction

Header Requirements

Opening Width (ft)

Building Width (ft)

Stories Supported

Ground Snow Load (PSF)

Opening Type

Header Material

Header Sizing Results

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Header Size
minimum

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Configuration

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0

Jack Studs

each side

0

King Studs

each side

0' 0"

Rough Opening

width

0"

Header Length

cut

0

Cripple Studs

above header

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Spacer

for 2x4 wall

IRC R602.7: Headers shall be provided above all openings in exterior bearing walls. Size based on span and loads supported.

IRC R602.7 Header Schedule (30 PSF Snow, Roof Only)

Opening	Building 20'	Building 28'	Building 36'
Up to 4'	2-2x4	2-2x4	2-2x6
4' to 5'	2-2x4	2-2x6	2-2x6
5' to 6'	2-2x6	2-2x6	2-2x8
6' to 7'	2-2x6	2-2x8	2-2x10
7' to 8'	2-2x8	2-2x10	2-2x10
8' to 9'	2-2x10	2-2x10	2-2x12
9' to 10'	2-2x10	2-2x12	2-2x12
10' to 12'	2-2x12	2-2x12	LVL/Eng

Note: For spans over 12' or heavy loads (2+ stories), engineered lumber (LVL, PSL, or glulam) is typically required. Consult an engineer for special conditions.