Interior Door Sizes

Interior doors come in a range of nominal widths and heights. This guide covers common interior door sizes, metric conversions, and important measuring considerations.

Common Interior Door Sizes

Nominal Size	Width	Height
24 × 80	24 in	80 in
28 × 80	28 in	80 in
30 × 80	30 in	80 in
32 × 80	32 in	80 in
34 × 80	34 in	80 in
36 × 80	36 in	80 in

Common Interior Door Widths

Common nominal interior door widths include 24, 28, 30, 32, 34, and 36 inches. The appropriate size depends on the room, building layout, opening, and specific door product.

Nominal size should not be treated as the exact measurement of the complete installed door. Actual slab and frame dimensions can vary.

Common Interior Door Height

An 80-inch nominal height is widely available for interior doors. Other heights are also available for specific products and designs.

When replacing an existing door, measure the opening and verify the manufacturer's dimensions before purchasing.

Interior Door Size vs. Rough Opening

The nominal door size and rough opening are different measurements. The rough opening is the framed opening prepared for installation.

Rough opening requirements vary by product and installation method. Use the manufacturer's installation instructions for the exact door.