A standard door sizes chart shows the slab dimensions and rough opening required for every common door type — interior, exterior, pocket, and barn. Rough openings are the framed wall openings before the jamb is installed; they must be larger than the door to allow for shimming and adjustment.
Interior Door Sizes
| Door Size | Rough Opening |
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Rough Opening Calculator
Enter the door slab dimensions to calculate the required rough opening.
ADA Door Width Requirements
- Minimum clear width: 32 inches (door open 90°) — requires a 34" door minimum
- Recommended: 36 inches door slab → 34" clear width — exceeds ADA minimum
- Commercial / public buildings: 36" doors are standard
- Wheelchair access: 36" door provides comfortable passage for standard wheelchairs (25–27" wide)
Door Type Guide
How to Use the Standard Door Sizes Chart
This free standard door sizes chart lists every common door slab dimension alongside the required rough opening — the framed wall opening before the door jamb is installed. Whether you're replacing an interior door, framing a new exterior opening, or planning an accessible renovation, getting these measurements right prevents expensive rework.
Step 1: Select Door Type
Use the Interior, Exterior, or Specialty tabs to filter the chart. Interior doors are typically 1-3/8 inches thick; exterior doors are 1-3/4 inches thick and require a larger rough opening allowance for weatherstripping. Specialty doors (pocket, barn, bi-fold) have their own sizing rules.
Step 2: Choose Your Units
Click inches or cm to toggle between imperial and metric measurements. US construction uses inches, but metric is helpful for comparing with international door standards or ordering hardware from overseas suppliers.
Step 3: Use the Rough Opening Calculator
Enter your door slab width and height into the Rough Opening Calculator to get the exact framed opening dimensions. Interior doors need 2 inches extra width and 2.5 inches extra height; exterior doors need 2.5 inches extra width to accommodate the thicker jamb and weatherstripping. The calculator also shows the clear width when the door is fully open, so you can verify ADA compliance.
Understanding Rough Openings
The rough opening is the gap in the framing — between the jack studs and below the header. The door unit (jamb + slab) fits inside this opening, with shim space on all sides for leveling and plumbing. A typical 2-inch width allowance breaks down as: 3/4" jamb + 1/2" shim + 3/4" jamb + small gap. Always verify with the door manufacturer's installation instructions, as pre-hung units may specify their own rough opening.
ADA Accessibility
The Americans with Disabilities Act requires a minimum 32-inch clear width when a door is open 90 degrees. Because the door slab itself occupies some of the rough opening when open, a 36-inch door (providing ~34 inches of clear width) is the practical standard for ADA-compliant passages. Bathrooms in accessible units typically require 36" doors; standard residential building codes may allow 32" minimums in some jurisdictions.
Common Door Size Mistakes
The most common mistake is measuring the rough opening and ordering a door of the same size — the door slab must be smaller, not the same. Another frequent error is forgetting to account for flooring height when calculating door height: if you're adding thick tile or hardwood after the door is framed, the door bottom may drag on the new floor. Always measure from the finished floor height, not the subfloor.
FAQ
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What is a rough opening for a door?
A rough opening is the framed opening in the wall — the space inside the jack studs, king studs, and header — before the door frame (jamb) is installed. It must be larger than the door itself to allow room for the jamb, shims, and a small gap for adjustment. Typically 2 inches wider and 2.5 inches taller than the door slab.
What is the standard interior door size in the US?
The most common interior door size is 32 inches wide by 80 inches tall (2'8" × 6'8"). This is the standard passage door for bedrooms, living rooms, and hallways. Bathroom doors are often 28 or 30 inches wide; small closets may use 18 or 24-inch doors.
What is the minimum door width for ADA compliance?
ADA standards require a minimum clear width of 32 inches when the door is open 90 degrees. A 36-inch door (3'0") provides 34 inches of clear width and is the recommended ADA-accessible door size. A 34-inch door just meets the minimum. Standard 30-inch doors do NOT meet ADA requirements.
What is the standard exterior door size?
The most common exterior door is 36 inches wide by 80 inches tall (3'0" × 6'8"). Taller 8-foot exterior doors (36" × 96") are increasingly popular in newer construction for a more dramatic entry. Double exterior doors are typically 60" or 72" wide total.
How much bigger should a rough opening be than the door?
Interior doors: the rough opening is typically 2 inches wider and 2.5 inches taller than the door slab (e.g., a 32" door needs a 34" × 82.5" rough opening). Exterior doors need slightly more: 2.5 inches wider and 2.5 inches taller to account for the thicker exterior jamb and weatherstripping.
What is the difference between a pocket door and a barn door?
A pocket door slides into a cavity inside the wall, completely disappearing when open — ideal for tight spaces where a swinging door would be impractical. A barn door slides along a track mounted on the wall surface and overlaps the opening when open. Barn doors require extra wall space beside the opening; pocket doors require thicker wall framing.