Studio Matrx Monthly · Volume 1 · Issue 1 · June 2026
Amogh N P
 In loving memory of Amogh N P — Architect · Designer · Visionary 
Curtain Calculator

Curtain Width Calculator

Work out the finished curtain panel width your window needs. Enter the window width, how far the track extends each side, whether you want a pair or single panel, and the heading — get the flat fabric width before pleating, instantly.

Your window

Extending the track 15–20 cm beyond the glass each side lets the curtains stack clear of the window, so the room feels brighter and the window looks wider. A pair also overlaps ~10 cm at the centre so the panels meet without a light gap.

Total flat fabric width

0 cm

about 0.00 m of fabric across the heading (both panels)

Track width

156 cm

rail / pole length to fit

Per-panel flat width

166 cm

each of two panels

Fullness

Pencil pleat

Centre overlap

10 cm

panels meet

Extension each side

18 cm

track beyond the glass

This is the flat fabric width before pleating — the cloth gathers up to the track width once the heading is sewn. To get total fabric in metres, multiply by the drop (plus hems and pattern repeat). Use the fabric quantity calculator for that.

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DesignAI recommends fabric, heading and layering to match your room, light and budget.

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