Curtain fabric calculator — window size to meters of cloth
Enter window width and drop, fullness, hem allowance, and fabric width to see panels and total fabric length to buy.
Units
Results
Cut width: 13 ft
Cut height: 9 ft
Panels: 3
Fabric length to buy: 27 ft
Formula
cutW=windowW×fullness; cutH=windowH+hem; panels=ceil(cutW÷fabricW); length=panels×cutH
Worked steps (check these)
- Cut width = 6.5 × 2 = 13 ft
- Cut height = 8 + 1 = 9 ft
- Fabric width = 54 in → 4.5 ft
- Panels = ceil(13 ÷ 4.5) = 3
- Fabric length to buy = 3 × 9 = 27 ft
Shopping estimates only — follow supplier safety notes and brand ratios.
Buying fabric by window width alone ignores pleats and hems. Fullness and panel math prevent short curtains and awkward seams.
How to use
- Measure window width and finished drop
- Choose fullness and hem allowance
- Enter fabric width (bolt width)
- Read panels and fabric length
Why this calculator
- Fullness and hems in one place
- Panel count from fabric width
- Imperial or metric units
Good for
- Living-room drapes
- Door curtains
- Simple lined panels
Tips
- Buy from one dye lot for wide windows.
- Heading tape and returns may need a little extra width.
Examples
| Input | Output | Note |
|---|---|---|
| 2 m wide, 2.4 m drop, 2× fullness, 0.3 m hem, 1.4 m fabric | 3 panels → 8.1 m fabric | Metric default example |
Curtain FAQ
- What fullness should I use?
- Pencil pleat often 2–2.5×; wave headings less. Start at 2× if unsure.
- Patterned fabric?
- Add extra length for pattern repeats — this tool does not auto-add repeats.
- Selling curtains on Etsy?
- Estimate take-home with Etsy fee calculator.