Curtain Size Converter
Calculate curtain panel width and drop from window dimensions using fullness ratios.
Includes rod length guidance and hem allowances for any curtain style.
Enter your window width and choose a fullness ratio.
Enter a window width to see results.
Curtains need to be wider than the window to look full and pleated.
Fullness ratio determines how gathered the curtains look:
- 1.5x = flat/casual look (minimal gathering)
- 2x = standard fullness (most common)
- 2.5x = full/luxurious look
- 3x = very full/formal (pinch pleats)
Curtain width formula:
- Total curtain width = window width × fullness ratio
Rod length guidelines:
- Rod should extend 8–12 inches (20–30 cm) beyond each side of the window
- This makes the window appear larger and allows curtains to stack off the glass
Example (metric):
- Window width: 150 cm
- Fullness: 2x
- Total curtain fabric: 150 × 2 = 300 cm
- Rod length: 150 + 20 + 20 = 190 cm
Example (imperial):
- Window width: 60 inches
- Fullness: 2x
- Total curtain fabric: 60 × 2 = 120 inches
- Rod length: 60 + 10 + 10 = 80 inches
For two panels, divide the total width by 2.