Curtain Sizes
Indoor Climate & Fixtures · 9 specs
Direct Answer
Window curtain panels standardize lengths across 63" (sill length), 84" (8-foot ceiling floor length), 96" (9-foot ceiling floor length), 108" (10-foot ceiling), and 120" (two-story), with a 1.5× to 2× fullness width multiplier.
Source: Window Coverings Association of America (WCAA) / Interior Design Standards · Last reviewed Aug 28, 2026
Specs
| Governing Standards | WCAA Standards / Interior Design Architectural Clearances |
| 63-Inch Panel Length | 160 cm | Window sill length / baseboard heater clearance |
| 84-Inch Panel Length | 213 cm | Standard floor length for standard 8-foot (96") ceilings (Universal) |
| 96-Inch Panel Length | 244 cm | Floor length for 9-foot (108") ceilings mounted near ceiling |
| 108-Inch Panel Length | 274 cm | Floor length for 10-foot (120") tall custom ceilings |
| 120-Inch Panel Length | 305 cm | Two-story foyers and dramatic high grand rooms |
| Fullness Width Multiplier | Total fabric width = 1.5× to 2.0× window frame width (2.5× for sheers) |
| Rod Mounting Height Rule | Mount rod 4 to 6 inches (10–15 cm) above window frame (or halfway to ceiling) |
| Rod Width Extension Rule | Extend rod 3 to 6 inches (7.6–15 cm) beyond frame sides for max natural light |
Window Curtain Panel Length & Ceiling Height Matrix
| Ceiling Height | Standard Curtain Panel Length | Metric Length | Mounting Position | Floor Break Style |
|---|---|---|---|---|
| 8 Feet (96") | 84 Inches | 213 cm | 4" above window frame | Kissing floor / 1/2" float |
| 8 Feet (96") | 96 Inches | 244 cm | Ceiling-mounted flush | Slight break on floor |
| 9 Feet (108") | 96 Inches | 244 cm | 4"–6" above window frame | Kissing floor (Standard 9 ft) |
| 9 Feet (108") | 108 Inches | 274 cm | Ceiling-mounted flush | Luxury puddle (2" on floor) |
| 10 Feet (120") | 108 Inches | 274 cm | 6" above window frame | Kissing floor (Standard 10 ft) |
| 10 Feet (120") | 120 Inches | 305 cm | Ceiling-mounted flush | Luxury puddle break |