Curtain Size Calculator

Choosing the right curtain size makes a huge difference in how a room looks. Curtains that are too narrow or too short look cheap and unfinished.

Curtain width calculation: The total curtain fabric width should be 1.5 to 3 times the window width, depending on the desired fullness.

• Minimal fullness (1.5×): Budget-friendly, casual look
• Standard fullness (2×): The most popular choice for most rooms
• Luxury fullness (2.5-3×): Rich, dramatic, formal look

If you are using two panels (one on each side), divide the total width by 2 to get the width per panel.

Curtain length options:

• Sill length: Bottom of curtain at the window sill. Best for kitchens and bathrooms.
• Below sill (apron length): 4-6 inches (10-15 cm) below the sill. Casual living spaces.
• Floor length: 1/2 inch (1 cm) above the floor. The most common and recommended length.
• Puddle: 2-6 inches (5-15 cm) of fabric pooling on the floor. Formal, dramatic look.

Rod placement matters:

• Hang the rod 4-6 inches (10-15 cm) above the window frame. This makes the window appear taller.
• Extend the rod 3-8 inches (8-20 cm) beyond each side of the window. This makes the window appear wider and allows curtains to be fully opened.

Measuring tips:

• Measure from the rod (not the window frame) to the desired endpoint for length.
• Measure the rod width (not the window width) for the starting width calculation.
• Always measure at multiple points — windows are not always perfectly square.