Curtain Panel Calculator

Find fabric width and panel count for gathered curtains.

How the Math Works

The Curtain Panel Calculator uses the formula fabric = rod width × fullness to determine the total fabric needed. Rod width is the linear measurement of the curtain rod, while fullness represents the multiplier for added fabric volume, typically ranging from 1.5 to 2.5 for gathered styles. Multiplying these values gives the required fabric width, ensuring sufficient material for pleats or drapes. Panel count is then derived by dividing the fabric width by individual panel dimensions, rounding up to account for seams or adjustments.

Practical Applications

To use this calculator, first measure the rod width (or window width) accurately. Decide on fullness based on desired style: 1.5–2x for subtle gathers, 2.5–3x for heavy pleating. Input these values into the formula to calculate total fabric width. For example, a 100-inch rod with 2x fullness requires 200 inches of fabric. Panels are then sized proportionally (e.g., 50-inch wide panels for 200-inch fabric), ensuring even distribution and proper drape.

Day-to-Day Use

This calculator simplifies home decor projects by eliminating guesswork and reducing fabric waste. It helps avoid costly mistakes like purchasing insufficient material or excess fabric, saving both time and money. Whether redecorating a bedroom, setting up a nursery, or installing new window treatments, users can confidently plan purchases and achieve professional results without trial-and-error adjustments, making DIY curtains accessible to all skill levels.

Worked example

60 in rod, 2× fullness → 120 in (3 panels).

FAQ