But not every door follows this rule. Bedroom doors, bathroom doors, front doors, and closet doors all carry their own typical sizes. Knowing these numbers saves you money, time, and a wasted trip to the hardware store.
Standard Door Dimensions at a Glance
Average Door Size in the US (Height x Width x Thickness)
The typical interior door measures 80 x 36 x 1 3/8 inches. In metric terms, that’s roughly 203 x 91 x 3.5 centimeters. Exterior doors share the same height but jump to 1 3/4 inches thick for added strength and insulation.
Standard Door Dimensions Chart (Interior vs Exterior)
Interior doors usually range from 28 to 36 inches wide. Exterior doors stay closer to 36 inches as a fixed norm, since building codes treat entry points differently than internal doorways.
Height rarely changes across either category, holding firm at 80 inches unless the home has taller ceilings.
Standard Interior Door Dimensions
Standard Bedroom Door Dimensions
Bedroom doors typically measure 80 inches tall and 32 to 36 inches wide. Wider openings are common in primary bedrooms, while secondary bedrooms often use the narrower 32-inch option to save wall space.
Standard Bathroom Door Dimensions
Bathroom doors run slightly smaller, at 78 to 80 inches tall and 24 to 32 inches wide. Smaller bathrooms, especially powder rooms, often use a 24-inch door to fit tight layouts.
Standard Closet Door Dimensions
Closet doors range widely depending on style. A single closet door usually sits at 24 to 30 inches wide, while bi-fold or sliding closet doors can stretch to 48 or 72 inches to cover larger openings.
Standard Interior Door Thickness
Nearly all interior doors use a 1 3/8-inch thickness. This is thin enough to keep the door lightweight but sturdy enough to block sound and hold its shape over time.
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Standard Exterior Door Dimensions
Standard Front Door Dimensions
The standard front door size is 80 inches tall and 36 inches wide. Some modern homes now install 96-inch tall doors for a grander entrance, especially in custom builds.
Standard Back Door and Patio Door Dimensions
Back doors typically match front door sizing at 80 x 36 inches. Patio doors, however, often widen to 60 to 72 inches since they usually consist of two sliding or French panels.
Standard Exterior Door Thickness and Material Differences
Exterior doors use a thicker 1 3/4-inch build. Steel doors offer strong security at a lower cost, fiberglass doors resist weather damage well, and solid wood doors bring a classic look but need more upkeep.
Standard Door Dimensions by Door Type
Standard French Door Dimensions
French doors commonly measure 80 inches tall with each panel at 30 to 36 inches wide, creating a combined opening of 60 to 72 inches.
Standard Sliding Door Dimensions
Sliding glass doors generally span 60, 72, or 96 inches wide, staying at the standard 80-inch height. Larger patios often favor the wider options for better outdoor views.
Standard Bi-Fold Door Dimensions
Bi-fold doors come in 24, 30, 36, 48, or 60-inch widths, folding flat against the wall to save floor space. These work well for closets and laundry rooms.
Standard Pocket Door Dimensions
Pocket doors slide directly into the wall and typically match standard interior sizing at 80 x 30 to 36 inches. They’re a smart pick for tight spaces where a swinging door would block traffic.
How to Measure Standard Door Dimensions Correctly
Step-by-Step Rough Opening Measurement Guide
Measure the width at the top, middle, and bottom of the opening, then use the smallest number. Do the same for height on both sides. A standard 36-inch door typically needs a rough opening of about 38 inches wide and 82 inches tall to allow for the frame and shims.
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FAQs About Standard Door Dimensions
What is the standard door size in the US?
The standard door size is 80 inches tall and 36 inches wide for exterior doors, with interior doors ranging from 28 to 36 inches wide.
What is the standard door height and width in feet?
In feet, that’s about 6 feet 8 inches tall and 3 feet wide for most doors.
Are all interior doors the same size?
No. Bedroom, bathroom, and closet doors each use different widths based on the room’s size and purpose.
What is the standard door thickness?
Interior doors use 1 3/8 inches, while exterior doors use a thicker 1 3/4 inches for durability.
What size rough opening do I need for a standard door?
A standard door needs a rough opening about 2 inches wider and 2 inches taller than the door itself.
Do door sizes differ by state or building code?
Sizes stay fairly consistent nationwide, though accessibility codes may require wider openings in certain public or commercial buildings.
James Walker is a content researcher and writer specializing in dimensions, measurements, size comparisons, and conversion topics. He creates clear, practical, and easy-to-understand guides that help readers visualize and understand real-world measurements.