Curtain Size Calculator
Calculate the fabric width and length needed for curtains based on your window dimensions and desired fullness.
Fabric Needed
Curtain Fabric Calculation:
Fabric Width = Window Width × Fullness Multiplier
Fabric Length = Window Height + Top Allowance + Bottom Hem
Unit conversions:
- Inches to cm: multiply by 2.54
- Cm to inches: divide by 2.54
Fullness multipliers:
- Standard (1.5×): Casual, relaxed look
- Full (2×): Most common for a polished appearance
- Luxurious (2.5×): Rich, formal drapes with deep folds
- Sheer (3×): Used for lightweight sheer fabrics
Standard allowances:
- Top (rod pocket/header): 3–4 inches (8–10 cm)
- Bottom hem: 4–8 inches (10–20 cm)
- Floor clearance: 0.5 inch (1.3 cm) above floor, or puddle on floor
Tip: Divide total fabric width by number of panels (usually 2) to get per-panel width.