Standard Door Sizes (USA): Interior & Exterior Door Dimensions + Charts
If you’re searching for standard door sizes, you’re probably trying to replace a door, order a new one, or confirm what’s “normal” before you measure. In the US, most homes follow a handful of common door dimensions—especially for 6’8″ (80″) tall doors—so once you know the basics, buying the right door gets much easier.In the USA, the most common standard door height is 80 inches (6’8″). Typical interior door widths are 24, 28, 30, 32, and 36 inches, while a common exterior/front door size is 36 x 80 inches. Interior doors are usually 1-3/8″ thick and exterior doors are often 1-3/4″ thick.
Quick answer: What are standard door sizes in the US?
Most “standard” doors fall into predictable buckets: interior, exterior/entry, and patio.
Standard interior door sizes (most common)
Common interior door heights:
80″ is the standard in many US homes
Taller options are increasingly common in modern builds (7′ and 8′ doors)
Common interior door widths:
24″, 28″, 30″, 32″, 36″
Quick rule of thumb:
30″–32″ is common for many rooms
36″ feels more spacious and can help with moving furniture and future accessibility
Standard exterior/front door sizes (most common)
A very common standard front/entry door size is:
36″ wide x 80″ tall
Entry doors can also come in broader ranges (especially newer homes), but 36″ x 80″ is the classic baseline.
Standard interior door dimensions by room
Here’s what homeowners typically use, and what tends to feel best in real life.
Bedroom doors
Most common choices:
30″ x 80″ or 32″ x 80″
36″ x 80″ if you want a more open feel or are thinking ahead for accessibility
Practical tip: If you’ve ever struggled getting a dresser through a doorway, you already understand why many people prefer 32″ or 36″ for bedrooms.
Bathroom doors
Bathrooms often use:
28″ x 80″ or 30″ x 80″
Some homes use 24″ in tight layouts, but it can feel cramped fast.
If you’re remodeling, consider bumping a bathroom to 30″ (or more) when space allows—small change, big comfort upgrade.
Closet doors (bifold & sliding)
Closets vary more because openings vary:
Older homes may have narrower closet doors, while newer homes often use wider/taller options
Closet doors are frequently bifold or sliding, sized to match the opening rather than a single “one size fits all” standard.
Tip: For closets, you’re often matching an opening width (like 48″, 60″, 72″) rather than choosing a single-slab width.
Pantry, laundry, and utility doors
Common choices:
28″–32″ wide, 80″ tall
Utility areas may use wider doors if appliances need to pass through comfortably.
Standard exterior door dimensions
Exterior doors are typically wider and thicker than interior doors.
Front entry doors
Most common:
36″ x 80″
Some guides note a wider overall range for entry doors depending on home style and manufacturer offerings.
Back and side doors
Often the same as front doors in many homes:
36″ x 80″ is very common
French doors
French doors are commonly sold as paired units, and sizes vary by configuration. Many sizing guides present French doors as part of exterior door sizing ranges and recommend measuring carefully before ordering.
Sliding patio doors
Sliding doors usually hold to a standard height with variable widths:
Height is commonly around 80.”
Width often varies based on the opening andthe number of panels
Door thickness: interior vs exterior
Thickness matters because it impacts hinges, jamb depth, and how “solid” the door feels.
Typical standards:
Interior door thickness: often 1-3/8″
Exterior door thickness: commonly 1-3/4″
If you’re replacing a door slab only, match the thickness exactly—or you can create alignment issues at the hinges and latch.
Door size vs rough opening vs “clear opening” (don’t mix these up)
This is where most ordering mistakes happen. People search for standard door dimensions, measure one thing, and accidentally buy something else.
Slab vs prehung (what you’re actually buying)
Slab door: just the door panel
Prehung door: door + frame (jamb) + hinges already attached
If you’re replacing a prehung unit, you usually care about the rough opening (framing size). If you’re replacing only a slab, you care about the door panel size and hinge/latch placement.
Rough opening rule-of-thumb (with examples)
Rough openings are typically larger than the door size to allow for the frame, shims, and leveling.
A common rough-opening guideline is:
Add about 2 inches to the width and ~2-1/2 inches to the height (varies by situation and floor conditions).
Example:
For a 32″ x 80″ door slab, a rough opening may be roughly 34″ x 82-1/2″ using the rule-of-thumb.
Always verify against the manufacturer’s installation specs—especially for specialty frames and exterior doors.
Accessibility (ADA): what “32-inch clear width” really means
A major source of confusion: door panel width is not the same as clear opening.
ADA guidance commonly references 32 inches minimum clear width with the door open 90 degrees, measured from the face of the door to the stop.
That means:
A “32-inch door” does not automatically guarantee a 32-inch clear opening, because hinges, door thickness, and stop location reduce usable clearance.
If accessibility is a priority in your home (now or later), 36″ interior doors are often chosen because they make it easier to achieve comfortable clearance.
How to measure a door (step-by-step)
Before you measure, decide what you’re replacing: slab or prehung.
Replacing a slab only (door panel)
Measure:
Width of the slab (left edge to right edge)
Height of the slab (top to bottom)
Thickness (most critical for matching)
Hinge locations (top of door to each hinge)
Backset (distance from door edge to center of the knob hole) if you’re also replacing the lockset
Tip: Take photos of the hinge edge and lock edge. It saves headaches at the store.
Replacing a prehung unit
Measure:
The existing door size (label on the jamb or measure the slab)
The jamb width (to match your wall thickness)
Whether it’s left-hand or right-hand swing (door “handing”)
For exterior: check the sill/threshold style
Measuring rough opening (framing)
If trim is removed or during new construction:
Measure stud-to-stud width and subfloor-to-header height
Confirm the opening is square (diagonal corner-to-corner measurements should match)
Common mistakes to avoid
Measuring the door, including trim. Trim is decorative; it’s not your door size.
Confusing door width with clear width. Accessibility is based on clear opening, not the label on the box.
Ordering a prehung when you needed a slab (or vice versa).
Ignoring thickness. Interior and exterior thickness commonly differ.
Forgetting flooring changes. New tile or thicker flooring can cause rubbing at the bottom.
FAQs
What is the standard interior door size?
In the US, standard interior doors are commonly 80″ tall, with widths such as 24″, 28″, 30″, 32″, and 36″ depending on the room.
What is the standard front door size?
A very common standard front door size is 36″ x 80″, though some homes use wider or taller entry doors.
What is a standard bedroom door size?
Bedroom doors are often 30″ x 80″ or 32″ x 80″. Many homeowners choose 36″ for a more open feel and easier furniture moves.
What size door works best for accessibility?
Accessibility guidance commonly references 32 inches minimum clear width with the door open 90 degrees. Because clear width is not the same as door panel width, many remodels choose 36″ doors where possible.
What is the rough opening for a 32×80 door?
A common rule-of-thumb is to add ~2″ to width and ~2-1/2″ to height, making it roughly 34″ x 82-1/2″—but always confirm with the exact prehung manufacturer specs.
Final takeaway
If you want the safest “standard” choice for resale and daily comfort:
Default to 80″ height
Use a 32″ interior for most rooms
Consider a 36″ interior for main pathways/primary bedroom
Expect 36″ x 80″ exterior as the most common starting point
