Complete Window Size Guide
Master window sizing with our comprehensive guide. Get accurate measurements, understand standard sizes, and choose the right windows for every room in your home.
The "Big 5" Window Sizes
These standard sizes cover approximately 70% of residential window needs
Window Size Calculator
Enter your measurements to find the closest standard size
Understanding Window Size Codes
Learn how to decode the 4-digit window sizing system
The 4-Digit System
Window codes use 4 digits: WWHH
- First 2 digits = Width (feet + inches)
- Last 2 digits = Height (feet + inches)
Example: 2844
28 = 2 feet, 8 inches wide (32")
44 = 4 feet, 4 inches tall (52")
So 2844 = 32" × 52" window
Important Note
Actual window dimensions are typically ½" smaller than the code to allow installation clearance.
Always verify with manufacturer specs!
How to Measure Windows Like a Pro
Follow these steps for accurate measurements every time
Measure Width
Measure inside jamb to inside jamb at three points:
- Top of window opening
- Middle of window opening
- Bottom of window opening
Record the SMALLEST measurement
Measure Height
Measure from sill to head jamb at three points:
- Left side
- Center
- Right side
Record the SMALLEST measurement
Check Square
Measure diagonally from opposite corners. If measurements differ by more than ¼", the opening isn't square.
Non-square openings may need custom windows.
- Including trim in measurements
- Measuring only one location
- Not checking if window opening is square
- Forgetting to account for house settling
Standard Sizes by Window Type
Common dimensions for each window style
🪟 Double-Hung Windows
Most popular type - classic up-and-down operation
- 2030 24" × 36"
- 2040 24" × 48"
- 2844 32" × 52"
- 3660 42" × 72"
- 4060 48" × 72"
Best for: Bedrooms, living areas, traditional homes
🖼️ Picture Windows
Fixed windows for maximum light and views
- 3030 36" × 36"
- 4040 48" × 48"
- 6040 72" × 48"
- 8040 96" × 48"
- 8060 96" × 72"
Best for: Living rooms, great rooms, scenic views
↔️ Sliding Windows
Horizontal operation, great for hard-to-reach areas
- 3024 36" × 24"
- 4030 48" × 36"
- 6030 72" × 36"
- 7240 84" × 48"
Best for: Over kitchen sinks, basements, decks
🚪 Casement Windows
Side-hinged, crank operation for full opening
- 1430 20" × 36"
- 2030 24" × 36"
- 2440 28" × 48"
- 3050 36" × 60"
Best for: Kitchens, bathrooms, modern homes
📐 Awning Windows
Top-hinged, open outward from bottom
- 2414 28" × 20"
- 3016 36" × 24"
- 4020 48" × 24"
- 6020 72" × 24"
Best for: Bathrooms, basements, clerestory windows
🏠 Bay & Bow Windows
Multi-window units that project outward from home
- Bay 3-unit 8' to 12' wide
- Bay 4-unit 10' to 14' wide
- Bow 4-unit 8' to 12' wide
- Bow 5-unit 10' to 15' wide
Best for: Living rooms, dining areas, creating focal points
🌿 Garden Windows
Projected greenhouse-style windows
- Standard 36" × 24"
- Large 48" × 30"
- Extra Large 60" × 36"
Best for: Kitchens, herb gardens, plant displays
⭐ Specialty Windows
Custom shapes and architectural features
- Round 12" to 60" diameter
- Arched Custom dimensions
- Geometric Custom shapes
- Decorative Various patterns
Best for: Architectural details, unique design elements
Room-by-Room Window Sizing Guide
Specific recommendations for each space in your home
🛏️ Bedrooms
Recommended Sizes:
- Primary: 3060 to 4072
- Secondary: 2040 to 3052
Code Requirements:
Upper floor bedrooms need minimum 20" × 20" for emergency egress
🛁 Bathrooms
Recommended Sizes:
- Standard: 2030 to 3036
- Master: 3036 to 4040
Code Requirements:
Minimum 3 sq ft opening if no exhaust fan
🍳 Kitchen
Recommended Sizes:
- Over sink: 3030 to 4030
- Breakfast nook: 4040 to 6040
Design Tip:
Consider counter height and backsplash when positioning
🛋️ Living Room
Recommended Sizes:
- Standard: 4060 to 6072
- Picture: 6040 to 8052
Design Tip:
Size proportional to ceiling height and furniture scale
Standard vs Custom Windows
When to choose each option for your project
✅ Choose Standard When:
- House is less than 50 years old
- Budget is a primary concern
- Timeline is important (2-4 weeks vs 8-12 weeks)
- Existing openings match common sizes
- Want energy-efficient options
🎯 Choose Custom When:
- Historic home with unique openings
- Architectural design requires specific sizes
- Standard sizes don't fit existing openings
- Creating signature design elements
- Structural constraints require odd sizes
Ready to Start Your Window Project?
You've explored the resources, now let's bring your vision to life. Schedule your free design consultation and get professional installation in as little as one day.
