Free door header size calculator for 2x4, 2x6, 2x8 headers. Calculate exact sizes for any door width and load-bearing wall. IRC code compliant results instantly.
Valid range: 12-144 inches
Valid range: 24-120 inches
The recommended header size is based on the door width and whether the wall is load bearing. Wider doors and load bearing walls require larger headers to properly support the structure above the door opening.
Discover more tools that might be useful for your workflow