Last updated: September 19, 2026
What Is a Door Size Chart?
A door size chart is a reference table listing standard door dimensions — width and height in feet-and-inch shorthand (2/6, 3/0) plus metric equivalents — along with nominal versus actual measurements, frame and rough opening requirements, and the applications each size suits. In North America, the most common residential door size is 2/6 (30 in. wide) for single interior doors and 3/0 (36 in. wide) for exterior entry doors, both typically 6/8 (80 in.) tall. A chart matters because door sizes are nominal labels, not finished dimensions: a “30-inch” door slab is usually 29¾ in. wide and fits a rough opening of roughly 32 in. × 82 in. once the frame is installed.
Standard Door Size Chart (with Inch Measurements)
The table below consolidates the sizes buyers ask about most. Width and height are given in the trade shorthand (feet/inches, as in 2/6 = 2 ft 6 in.), followed by actual slab dimensions and the rough opening the frame needs.
| Code | Nominal W × H | Actual Slab (approx.) | Rough Opening (approx.) | Typical Application |
|---|---|---|---|---|
| 2/0 | 24 in. × 80 in. | 23¾ × 79½ in. | 26 × 82 in. | Bathroom, closet, utility |
| 2/4 | 28 in. × 80 in. | 27¾ × 79½ in. | 30 × 82 in. | Bathroom, small bedroom |
| 2/6 | 30 in. × 80 in. | 29¾ × 79½ in. | 32 × 82 in. | Standard bedroom, interior |
| 2/8 | 32 in. × 80 in. | 31¾ × 79½ in. | 34 × 82 in. | Bedroom, accessible interior |
| 2/10 | 34 in. × 80 in. | 33¾ × 79½ in. | 36 × 82 in. | Wide interior, hallway |
| 3/0 | 36 in. × 80 in. | 35¾ × 79½ in. | 38 × 82 in. | Main entry, exterior |
| 3/6 | 42 in. × 80 in. | 41¾ × 79½ in. | 44 × 82 in. | Entry, French pair leaf |
| 4/0 | 48 in. × 80 in. | 47¾ × 79½ in. | 50 × 82 in. | Double door leaf, patio |
Two rules govern the whole chart. First, rough opening is generally door width plus 2 in. and door height plus 2 to 2½ in., which leaves room for the jamb, shims, and squaring. Second, metric equivalents are approximate conversions, not separate standard sizes: a 2/6 door converts to about 762 mm × 2032 mm, but no metric market lists “762 mm” as a nominal door. If you are working to metric standards, confirm the local nominal series rather than converting this chart.
Door thickness follows its own convention. Interior doors are commonly 1⅜ in. thick; exterior and entry doors are commonly 1¾ in. thick. Thickness changes hinge and lockset hardware, so it must be specified alongside width and height — a 3/0 × 6/8 door in 1⅜ in. and one in 1¾ in. are not interchangeable.
Terms buyers should know
| Term | What it means | Why it matters when buying |
|---|---|---|
| Nominal size | The trade label (e.g., 2/6, 3/0), not a measured dimension | Ordering by nominal size avoids mismatch between the label and the actual slab |
| Actual size | The finished slab measurement, usually slightly under nominal | Determines whether the door fits the existing frame without trimming |
| Rough opening | The framed wall gap before the jamb is installed | Sets the wall framing; if wrong, the door cannot be hung without rework |
| Door framing size | The jamb and frame dimensions that sit inside the rough opening | Connects the rough opening to the finished door size you actually order |
How to Read Door Size Codes (2/6, 3/0, 2468, etc.)
Door size codes are written as feet over inches: 2/6 means 2 feet 6 inches wide, 3/0 means 3 feet 0 inches wide. Height is stated separately, and 6/8 (6 ft 8 in., or 80 in.) is the residential default. So a “3/0 × 6/8” door is 36 in. wide and 80 in. tall.
The compressed form “2468” is a shorthand you will see in some catalogs and order sheets. It is not a single size; it is a four-digit code that typically reads as 2/4 width and 6/8 height — that is, a 28 in. × 80 in. door. Some suppliers use similar four-digit strings for other combinations, so the safe practice is to confirm the reading with the supplier rather than assume. If a quote or packing list shows “2468,” ask for the width and height written out.
Two more conventions are worth knowing:
- A “2/8 door” (32 in. wide) and a “2/6 door” (30 in. wide) are the two most common interior sizes. The difference looks small but affects furniture clearance and whether the door meets accessibility guidance.
- A “2/0 door” (24 in. wide) is often the smallest standard slab sold as a stock item; below that, sizes move into special-order territory.
Measuring Your Doorway and Frame Size
Measuring for a door is a three-measurement job, and the smallest number wins. Whether you are replacing a slab or ordering a prehung unit, the sequence is the same.
- Measure the opening width at the top, middle, and bottom of the frame. Record the smallest figure.
- Measure the height on the left, center, and right. Record the smallest figure.
- Measure the wall thickness at several points to confirm the jamb depth the frame must cover.
For a replacement slab (reusing the existing frame), measure the existing door itself: width at top, middle, and bottom; height at left, center, and right; and thickness. Take the smallest width and the smallest height. Slabs are frequently trimmed slightly on site, so a door labeled 2/6 may measure 29½ in. after previous fitting — order to the measured size, not the label.
For a prehung unit (door plus frame), measure the rough opening instead. A typical 2/6 prehung door needs roughly 32 in. × 82 in.; a 3/0 needs roughly 38 in. × 82 in. If the rough opening is out of square by more than about ¼ in., the frame will need shimming, and in older homes the opening may need reframing before a standard unit will fit.
Three mistakes cause most ordering errors:
- Measuring the old door and assuming the frame is square. Measure the frame opening too.
- Forgetting floor finish. If tile or hardwood will be added after the door is hung, the finished floor height changes the clearance under the slab.
- Ignoring swing and handing. Width and height do not tell you which way the door opens; handing must be specified separately.
A practical checklist before ordering: opening width (smallest), opening height (smallest), wall thickness, door thickness, swing direction, and hinge side. Photograph the opening with a tape measure in frame — it resolves most supplier questions in one exchange.
Common Door Sizes by Application
Different parts of a building converge on different standard sizes, and knowing the default for each application prevents over- or under-specifying.
Interior doors. The standard interior door is 2/6 × 6/8 (30 in. × 80 in.), with 2/8 (32 in.) common in bedrooms and 2/4 (28 in.) in bathrooms. Interior slabs are usually 1⅜ in. thick. Closet openings often use 2/0 or wider bifold panels rather than a swinging slab.
Exterior and entry doors. The standard exterior door is 3/0 × 6/8 (36 in. × 80 in.), commonly 1¾ in. thick for hardware and weather performance. Wider entries use 3/6 or paired leaves, and taller 8/0 (96 in.) units appear in higher-end residential work. For a deeper look at how exterior sizing is specified, see the guide to standard exterior door dimensions.
Patio sliding doors. Sliding units are sized as a complete assembly, not a single slab. A common two-panel patio slider is about 72 in. wide × 80 in. tall, with wider three- and four-panel configurations available. Because the frame, track, and panels are engineered together, the assembly size is the specification — you do not order panels to a rough opening independently.
Man doors. In commercial and industrial settings, a “man door” is a pedestrian door within a larger assembly, such as a warehouse wall or a garage. These are typically 3/0 × 6/8 or 3/0 × 7/0 (36 in. × 84 in.), with 1¾ in. thickness and heavier hardware.
French and specialty doors. French doors are ordered as pairs or leaves with defined nominal widths; the pair width is the sum of the leaves plus the meeting stile. Because the sizing logic differs from single doors, it is worth reading a dedicated reference such as standard French door sizes before specifying.
Accessibility note. Where accessibility guidance applies — for example, the ADA Standards for Accessible Design and ICC A117.1 — a 32 in. clear opening is commonly cited as the minimum for a user to pass, which is why a 2/8 or 3/0 door is often specified rather than a 2/6. These requirements are not universal: they depend on occupancy, jurisdiction, and whether the project is subject to a specific code. Confirm with the local code authority rather than applying the number broadly.
Custom and Odd-Size Doors
Standard sizes exist because they simplify framing, hardware, and inventory — but a large share of real buildings do not cooperate. Older homes are the most common source of non-standard openings, especially pre-1950s construction where door heights of 78 in. or odd widths are routine. Commercial and renovation projects add their own irregular openings.
When a standard size will not work, there are three routes:
- Trim down a larger standard slab. Doors can be cut to size within limits set by the door’s construction. Solid wood doors tolerate modest trimming; hollow-core and some engineered doors have edge limits that restrict how much can be removed, and trimming the wrong edge can void a warranty or expose the core.
- Order a custom slab or prehung unit. Custom sizing is the reliable route for odd widths, non-standard heights, or metric-market dimensions. It costs more and adds lead time, but it avoids the fit and finish problems that come from forcing a standard door into an irregular opening.
- Reframe the opening. Where the wall is being opened anyway, adjusting the rough opening to a standard size can be cheaper over the life of the project because future replacements stay simple.
Two practical cautions. First, odd-size exterior doors carry more risk than interior ones: weather sealing, thresholds, and hardware are all designed around standard dimensions, so custom exterior units need the frame, sill, and hardware specified together. Second, metric-market projects should be specified in the local nominal series from the start. Converting an inch chart produces dimensions that no local supplier stocks and no local hardware matches.
Related Considerations
A few numbers come up repeatedly once buyers start comparing quotes, and they are worth fixing in mind before ordering.
Smallest and average sizes. The smallest common stock door is 2/0 (24 in. wide); narrower slabs exist but are usually special-order. The average door size in residential construction is 2/6 × 6/8 for interiors and 3/0 × 6/8 for entries — those two sizes account for the majority of residential doors sold.
What is the size of a door, generally? If someone asks “what size are doors” without further context, the honest answer is 30 in. × 80 in. for interior and 36 in. × 80 in. for exterior, with the caveat that these are nominal labels and actual slabs run slightly smaller.
Frame and doorway size. The doorway size (rough opening) is not the door size. As a working rule, add about 2 in. to the door width and 2 to 2½ in. to the height to get the rough opening a standard frame needs. Door framing size — the jamb depth — must match the wall thickness, which is why wall thickness belongs on every measurement sheet.
Custom interior doors. Custom sizing is common for interior doors in renovation work, where matching an existing opening matters more than hitting a catalog number. It is usually the fastest path when the opening is out of square or the existing trim must be reused.
Reading a quote correctly. When a supplier quotes “2/8,” confirm whether that is the slab or the prehung unit, and confirm thickness. Those two clarifications prevent most order errors.
In short: a door size chart is a reference table of standard door dimensions written in feet-and-inch codes such as 2/6 and 3/0, with nominal labels that differ slightly from actual slab measurements. It pairs each size with the rough opening and frame requirements the wall must provide, and it distinguishes interior sizes, exterior sizes, and assembly-based sizes like patio sliders. Reading it correctly depends on measuring the smallest opening dimension, confirming thickness and handing, and knowing when a standard size will not fit and a custom door is required.
As a manufacturer, our approach to this is straightforward: we build to the size the opening actually is, not to the nearest catalog number. Custom sizing on width, height, thickness, color, glass, and hardware is standard production for us rather than an exception, and profile structure and fittings can be adjusted to match the building codes of the destination market. Every unit is checked before shipment for air-tightness, water-tightness, and wind resistance, and we supply the packing list, proforma invoice, and customs documents that accompany FCL or LCL shipments from our factory. If you are working from a measured opening — standard or odd — Contact Our Team with the dimensions and we will confirm what fits.
