Standard Door Sizes: U.S. Width, Height & Size Chart

A “standard door size” is a common product size, not one dimension that fits every opening. In one U.S.-market manufacturer's interior hinged-door catalog, common door slabs are 24, 28, 30, 32, 34, or 36 inches wide and 80 inches high. Its catalog also lists 96-inch-high slabs. Availability varies by manufacturer, door type, and project.

The rough-opening figures above are that manufacturer's examples for its products; they are not a universal installation rule. Confirm the exact opening with the selected prehung unit and installation instructions.

Door shorthand commonly gives width first and height second in feet and inches. For example, 2/8 × 6/8 means a 2-foot-8-inch-wide by 6-foot-8-inch-high slab: 32 × 80 inches. Likewise, 3/0 × 6/8 means 36 × 80 inches. Always check whether a chart describes the door slab, the frame, or the rough opening.

The door leaf's listed size does not equal the clear passage when the door is open. Hinges, stops, and the door's thickness reduce the space a person can pass through.

• Door slab: the movable panel itself; a catalog may call this the door size.
• Rough opening: the framed wall opening before the jamb and trim are installed. Its required size depends on the prehung unit and installation method.
• Clear opening: the usable gap when the door is open, measured between the face of the door and the stop for a swinging door.

The 2010 ADA Standards require at least 32 inches of clear width for door openings on an accessible route, measured with a swinging door open 90 degrees. A 32-inch nominal slab does not automatically provide 32 inches of clear opening. The applicable standards and exceptions depend on the facility and route.

For an interior replacement, measure the old slab's width, height, and thickness, then check the jamb, hinge placement, swing, and finished floor. If ordering a prehung door, follow that product's rough-opening instructions and account for flooring and framing conditions.

Exterior entry doors often use a 36 × 80-inch nominal slab in current U.S. product lines, but older homes and specialty designs can differ. Verify the exact door and frame dimensions, threshold, handing, weather seals, and any local egress or energy requirements before ordering. “Standard entry door dimensions” should be treated as a common market size, not a guarantee that the door will fit an existing opening.

Measure the existing slab, not just the visible opening, and record width, height, and thickness. For a replacement prehung unit, remove or inspect trim when practical so you can measure the framed rough opening. Check whether the dimensions supplied by the seller refer to slab size or the full frame.

For accessibility planning, measure the clear opening with the door fully open and check maneuvering space as well as width. Confirm current local requirements with the building department or a qualified professional; model codes and accessibility rules have different scopes.