Curtain Size Calculator

Curtain length depends on where your rod is mounted and the style you want. For a standard floor-length curtain, measure from the rod (or the top of the ring/hook) down to the floor, then subtract 0.5 inches for clearance. For a puddle effect, add 3–6 inches. Our calculator handles all these adjustments automatically based on your inputs.

Curtain width is determined by multiplying your rod length by a fullness factor. Standard fullness is 2× the rod length, meaning if your rod is 72 inches, you need 144 inches of total curtain fabric. Divide by the number of panels to get the width per panel. Deluxe or very gathered curtains use 2.5× or even 3×.

The general rule is that curtain panels should together be 2 to 2.5 times the width of the window or rod for a full, attractive look. Light sheers may use up to 3×, while minimal or modern styles can use as little as 1.5×. Avoid using curtains that are narrower than 1.5× the rod — they will look flat and skimpy.

For a 72-inch rod with standard 2× fullness, you need 144 inches of total curtain fabric. If you are using 2 panels, each panel should be 72 inches wide. For deluxe fullness at 2.5×, you would need 180 inches total — 90 inches per panel. Always account for any overlap or return on the rod brackets.

Most interior designers recommend that curtains either just skim the floor (about 0.5 inch clearance), puddle slightly (3 inches extra), or hang to a specific architectural feature like the windowsill or apron. Curtains that hang too short or hover awkwardly above the floor tend to look unfinished. The best choice depends on your room's style and practical needs.

Mounting the rod 4–6 inches above the window frame is standard, but many designers recommend going higher — up to 8–12 inches, or even just below the ceiling — to make the room appear taller. Our calculator lets you input your actual 'space above window frame' measurement to compute the correct curtain length for your specific installation.

The most common ready-made curtain lengths are 63 inches, 84 inches, 96 inches, 108 inches, and 120 inches. The right length for you depends on your rod height and desired style. Use our calculator to find your exact measurement, then choose the nearest standard length or order custom curtains.

Rod length is the physical span of your curtain rod. Curtain width refers to the total amount of fabric needed across all your panels, which should be 2–2.5× the rod length to achieve proper fullness. Per-panel width is the total fabric width divided by the number of panels you are hanging.