Curtain Width & Panel Calculator

Measure and plan

1. Measure the full span the closed curtains should cover, excluding decorative finials. Include returns or overlap once in that span.
2. Choose a fullness ratio. At 2×, the flat fabric width totals twice the coverage span.
3. For shopping, enter a finished panel's flat usable width and specify whether the label describes one panel or two.

What the results separate

• See required flat width per panel for a chosen installed count.
• Compare minimum installed panels with an optional even count for equal sides.
• Keep packs purchased, panels supplied and panels actually hung distinct.
• Use the installed count for fullness, even when a pack supplies an unused panel.

When this helps

• Plan curtains for an installed rod without guessing from window width.
• Check a pair label before ordering packs.
• See whether curtains you own reach a chosen fullness.

Understand the numbers

A 240 cm pole at 2× needs 480 cm of total flat width. With two equal panels, each needs 240 cm. A 72 inch span at 2× needs 144 inches total.

If a label says 280 cm for two identical panels, each panel contributes 140 cm. A pack of two can still show the width of one panel; inspect the product description.

Three 50 inch panels cover a 72 inch span at just over 2×. Two packs of two supply four panels, but only three are installed unless you choose an even layout.

These figures use completed flat panel widths. A pre-pleated product may already quote its finished coverage width; follow the maker's fitting instructions. Drop, sewing yardage, hardware and light blocking are outside this calculation.

Privacy and limits

Your measurements stay in this browser while calculating. Regular site services may still contact the network.

The drawing shows widths schematically; fabric behavior and physical closure are not guaranteed.