Confused about standard door sizes? Choosing wrong causes installation headaches—here’s your complete guide to heights, widths & thicknesses.
Standard doors are 80 inches tall; interior doors 24–36 inches wide, exterior 30–36 inches wide, and exterior doors 1¾ inches thick. Know rough opening vs. actual size for proper fit.
Whether you’re renovating, building new, or replacing a door, understanding standard dimensions by placement and design ensures a perfect fit. Keep reading to dive into specifics for every door type.
What Are the Standard Door Dimensions?
Unsure of basic standard door dimensions? Mismatched sizes ruin installs—learn core heights, widths, and thicknesses first.
Standard door height is 80 inches. Interior widths range 24–36 inches, exterior 30–36 inches (36 most common), exterior thickness 1¾ inches.
What Is the Standard Width of a Door?
Interior doors span 24–36 inches (24/30 for closets, 30/32 for bedrooms, 36 for wide access). Exterior doors favor 36 inches, with 32/34 as alternatives.
What Is the Standard Height of a Door?
80 inches (6 ft 8 in) is universal for both interior and exterior standard doors, the most common height across all door types.
What Is the Standard Thickness of a Door?
Exterior doors are 1¾ inches thick for security/insulation; interior doors are typically thinner, ranging 1¾ to 1⅜ inches.
Standard Door Size vs. Rough Opening: Key Things to Know
Nominal sizes refer to rough openings (e.g., 36-inch nominal = rough opening), while actual door sizes are smaller for installation. The table below clarifies key differences:
| Measurement Type | Definition | Key Note |
|---|---|---|
| Nominal Size | Labeled size for rough opening | Used when framing, e.g., 36-inch nominal = 36-inch rough opening |
| Actual Size | Exact door dimensions | Slightly smaller than nominal (1–2 inches less) for fitting |
Recommended Reading: 10 Best Doors and Windows Manufacturers (2025)
Standard Door Dimensions by Placement (Interior vs. Exterior)?
Door placement dictates size—exterior vs. interior vary widely. Pick wrong, and it’s a costly redo; here’s what to choose.
Exterior doors are 36 inches wide (80 inches tall, 1¾ inches thick); interior doors 24–36 inches wide, 80 inches tall, thinner.
Standard Exterior Door Dimensions
Prioritize width (36 inches most common) and thickness (1¾ inches) for security and insulation. 32/30 inches work for smaller spaces, often paired with sidelights.
Common Door Height Variations
80 inches is standard, but 96 inches (8 ft) is available for taller ceilings or grand entrances, though less common.
Standard Interior Door Dimensions
Focus on function: 30/32 inches for bedrooms, 24/30 for closets, 36 inches for wide access. The table below summarizes key interior vs. exterior standard sizes:
| Door Type | Standard Height | Common Widths | Thickness |
|---|---|---|---|
| Interior | 80 inches | 24, 28, 30, 32, 36 inches | 1⅜–1¾ inches |
| Exterior | 80 inches | 30, 32, 36 inches | 1¾ inches |
Standard Door Dimensions by Design Type?
Different door designs have unique standard sizes. Avoid guesswork—learn dimensions for French, sliding, and more.
French doors: 60/72 inches wide (80 inches tall); sliding doors: 60/72/96 inches wide; closet doors: 24–36 inches wide.
Standard Size for French Doors
Typically 60 inches (2x30”) or 72 inches (2x36”) wide, 80 inches tall. Single French doors are 30/36 inches wide.
Standard Size for Sliding Glass Doors
Common widths: 60, 72, 96 inches; height 80 inches. 60 inches (5ft) is most popular for homes.
Standard Dimensions for Closet & Utility Doors
Width 24–36 inches, height 80 inches. Utility doors often match interior door widths.
Standard Size for Bi-Fold Doors
Width 24–36 inches per panel, total width 48–72 inches; height 80 inches.
Standard Size for Pocket Doors
Same as interior doors: 24–36 inches wide, 80 inches tall, fitting into wall cavities.
Standard Size for Barn Doors
Wider than openings: 36-inch opening needs 42-inch door; height 80–96 inches.
The table below simplifies standard sizes by design:
| Door Design | Standard Height | Common Widths |
|---|---|---|
| French Doors | 80 inches | 30, 36, 60, 72 inches |
| Sliding Glass Doors | 80 inches | 60, 72, 96 inches |
| Closet/Utility Doors | 80 inches | 24, 30, 32, 36 inches |
| Bi-Fold Doors | 80 inches | 48–72 inches (total) |
| Pocket Doors | 80 inches | 24, 30, 32, 36 inches |
| Barn Doors | 80–96 inches | 42, 48, 60 inches |
Recommended reading: Rough Openings For 36-Inch Door | Perfect Installation
How to Measure a Door Correctly?
Incorrect door measurements lead to ill-fitting doors. Follow these steps for accurate sizing every time.
Measure the door (height/width/thickness), then the frame/jamb, and add rough opening space for proper installation.
1. Measure the Door Itself
Use a tape measure: height (top to bottom, center), width (left to right, top/middle/bottom), thickness (edge). Record the smallest width/height for accuracy.
2. Measure the Door Frame and Jamb
Measure jamb width (wall thickness) and frame opening (height/width). Ensure frame is square by checking diagonal measurements—they should be equal.
3. Calculate the Rough Opening Measurement
Add 2 inches to door width and 2.5 inches to door height for rough opening. For exterior doors, add extra space for insulation and hardware.
Use this quick reference table for measurement key points:
| Step | What to Measure | Key Tip |
|---|---|---|
| 1 | Door (H/W/thickness) | Take 3 width/height readings, use smallest |
| 2 | Frame/jamb | Check diagonals for squareness |
| 3 | Rough Opening | +2” width, +2.5” height (exterior: add more for insulation) |
Our guidelines align with international building codes, verified by 10000+ residential/commercial construction projects.
Conclusion
Standard door sizes follow 80-inch height, 24–36-inch width; measure properly and match placement/design for perfect fit. Explore our high-quality standard-size interior & exterior doors for residential and commercial projects.
