Curtain Size Calculator
Calculate the perfect curtain size for your windows. Enter window height and width, choose length style and fullness for accurate curtain dimensions instantly.
About This Calculator
About the Curtain Size Calculator
Our Curtain Size Calculator helps homeowners, interior designers, and DIY enthusiasts find the perfect curtain dimensions for any window. Whether you are decorating a new home or refreshing an old space, getting the right curtain size is essential for a polished, professional look. Simply enter your window measurements and preferences to receive accurate length and width recommendations instantly.
The calculator uses proven formulas based on interior design standards. For curtain length, we add the rod height (typically 4 inches above the window) to your measured height. For café-style curtains, the length is approximately half the window height. Extra long curtains that pool on the floor include an additional 6 inches. For curtain width, we multiply your window width by the fullness ratio — standard (2x), deluxe (2.5x), or ultra (3x) — to determine the total fabric width needed, then recommend the optimal number of panels based on standard panel widths of 54 inches.
Regional Notes
India: Curtains in Indian homes typically range from floor-length to sill-length. Standard window sizes vary, with many homes using custom-made curtains. Mount curtain rods 4–6 inches above the window frame. Fullness of 2x is most common.
United States: Standard curtain lengths of 84, 96, and 108 inches are widely available. Pre-made panels in 48–54 inch widths are common. Rods are usually mounted 4–6 inches above the window for standard 8–9 foot ceilings.
United Kingdom: Curtains are often custom-made or bought in standard sizes. Track systems are common alongside rods. Typical fullness is 2x for standard curtains, with 2.5x preferred for more formal spaces. Measure in both inches and centimetres for accuracy.
Frequently Asked Questions
How do I measure my window for curtains?
Measure the width of your window from left outer edge to right outer edge of the frame. For height, measure from the top of the window frame to where you want the curtain to end — the floor for floor-length curtains, the sill for sill-length, or the bottom of the apron for apron-length curtains. Always use inches or centimeters consistently.
What curtain length should I choose for my room?
Floor-length curtains that kiss or barely touch the floor create an elegant look suitable for living rooms and bedrooms. Sill-length curtains end at the window sill and work well for kitchens and bathrooms. Apron-length curtains extend 1–3 inches below the sill and suit casual spaces. Café curtains cover only the bottom half of the window for privacy while letting in light. Extra long curtains that pool on the floor add a luxurious, dramatic feel.
What is curtain fullness and how much do I need?
Curtain fullness refers to how much wider the curtain fabric is compared to the window width. Standard fullness (2x) means the curtain is twice the window width, which works for most rooms. Deluxe fullness (2.5x) provides a richer gathered look ideal for living rooms and formal spaces. Ultra fullness (3x) creates a luxurious, full appearance perfect for large windows and formal dining rooms.
How wide should curtains be for a 48-inch window?
For a 48-inch window, the total curtain width should be 96 inches with standard fullness (2x), 120 inches with deluxe fullness (2.5x), or 144 inches with ultra fullness (3x). This total width is typically divided into two panels, so each panel would be approximately 48–72 inches wide depending on your fullness choice.
What are standard curtain sizes in inches?
Standard curtain lengths for long curtains are 72, 84, 96, and 108 inches. Short curtain standard lengths are 24 and 36 inches. Standard curtain widths are typically 48, 54, 60, 72, 84, 96, and 108 inches per panel. Always measure your specific window rather than relying on standard sizes alone.
How high should I mount curtain rods?
Mount curtain rods 4–6 inches above the window frame for standard ceilings. For rooms with very high ceilings, mounting 6–10 inches above the window creates the illusion of taller windows. In the US, rods are typically mounted 4–6 inches above. In the UK and India, a similar 4–6 inch rule applies, but measure your specific clearance before installation.
How many curtain panels do I need per window?
Most windows need 2 curtain panels — one on each side. For very narrow windows under 28 inches wide, a single panel may suffice. For wide windows over 72 inches, you may need 3–4 panels to achieve proper fullness. The curtain size calculator automatically recommends the optimal number of panels based on your window width and chosen fullness.
Should curtains touch the floor?
Floor-length curtains should ideally kiss the floor (barely touching) or hover about half an inch above for easy opening and closing. Curtains that pool on the floor add 6 extra inches for a romantic, luxurious look. Curtains that stop short of the floor (more than 2 inches above) can appear unintentional and reduce the perceived height of the room.