Window Size Calculator
Calculate window dimensions, rough opening size, and egress compliance. Choose a standard window preset or enter custom measurements.
Window Size Calculator
Results
✓ Egress compliantSingle-Hung
Window Width
36"
Window Height
48"
Rough Opening W
38"
Rough Opening H
50"
Total Area
12.00 ft²
Net Opening
6.00 ft²
Window: 36" W × 48" H · 3'-0" × 4'-0" · RO: 38" × 50"
Standard Window Size Reference
| Type | Width | Height | Rough W | Area (ft²) |
|---|---|---|---|---|
| Small Single | 24" | 36" | 26" | 6.00 |
| Standard Single | 36" | 48" | 38" | 12.00 |
| Large Single | 48" | 60" | 50" | 20.00 |
| Wide Double-Hung | 36" | 60" | 38" | 15.00 |
| Casement 24x48 | 24" | 48" | 26" | 8.00 |
| Casement 30x54 | 30" | 54" | 32" | 11.25 |
| Sliding 48x36 | 48" | 36" | 50" | 12.00 |
| Sliding 72x48 | 72" | 48" | 74" | 24.00 |
| Picture 48x48 | 48" | 48" | 50" | 16.00 |
| Bay Window 96x48 | 96" | 48" | 98" | 32.00 |
| Egress Min 20x24 | 20" | 24" | 22" | 3.33 |
| Egress Standard | 36" | 24" | 38" | 6.00 |
Window Type Guide
Single-Hung
Lower sash slides up. Most common residential type.
50% of areaDouble-Hung
Both sashes slide. Easy to clean from inside.
50% of areaCasement
Hinged at side, swings outward. Best ventilation.
100% of areaSliding
Sash slides horizontally. Good for wide openings.
50% of areaPicture
Fixed, no opening. Maximum light, no ventilation.
0% — fixedAwning
Hinged at top, swings out. Can open in rain.
~80% of areaHow to Use
- 1Select a preset or type custom width and height
- 2Choose the window type for accurate net opening
- 3Adjust rough opening allowance if needed
- 4Check egress compliance for bedroom windows
Egress Requirements
IRC requires egress windows in all sleeping rooms:
Min Width: 20"
Min Height: 24"
Min Opening: 5.7 ft²
Max Sill: 44" from floor