Curtain Size Calculator
Measure your window, choose the fullness (gather) you like, and get the total curtain width, finished drop, number of standard panels and fabric length to buy.
Enter window measurements to calculate curtain sizes.
How to use
- Measure the rod or track width (extend 15 to 20 cm beyond the window on each side) and the drop you want.
- Choose a fullness factor — 2x is the standard full look for most fabrics.
- Buy the number of panels and fabric length shown, which already include hem allowance.
Finished curtain width equals rod width multiplied by the fullness factor, so the fabric still gathers nicely when closed. Fabric length to buy per panel equals the drop plus the hem allowance. Sheers usually use 2.5x to 3x fullness.