Getting the curtain width right is one of the most important steps in creating a polished, functional look for your windows. Too narrow, and your curtains will look skimpy and awkward. Too wide, and they may bunch excessively, blocking light or overwhelming the space. In this guide, we’ll break down the exact formulas and recommendations for calculating curtain width, whether you’re shopping ready-made panels or ordering custom drapery. You’ll also learn how window size, curtain style, and fabric type can affect the ideal width.
Quick Tip: For custom sizing and instant price estimates, try our Curtain Width Calculator.
The General Rule for Curtain Width
- Measure the total width of your window (including trim).
- Multiply by a fullness factor—usually 1.5× to 2.5×.
- 1.5× for a tailored, minimal look.
- 2×–2.5× for a fuller, more luxurious look.
- This measurement is total fabric width, not per panel.
Example:
Window width: 72 in
Fullness factor: 2×
Total curtain width needed: 144 in (two 72-inch panels or four 36-inch panels)
Width Guidelines by Window Size
| Window Width | Minimal Fullness (1.5×) | Standard Fullness (2×) | Luxurious Fullness (2.5×) |
|---|---|---|---|
| 48 in | 72 in | 96 in | 120 in |
| 60 in | 90 in | 120 in | 150 in |
| 72 in | 108 in | 144 in | 180 in |
| 96 in | 144 in | 192 in | 240 in |
Adjusting Width for Curtain Style
- Grommet / Ripple fold Curtains – Need slightly more width for natural folds, use 2×fullness.
- Rod Pocket – Can work with less fullness, but still aim for at least 1.5×.
- Pinch Pleated Drapes – Often pre-set with fullness, Default 2×fullness.
Special Considerations
- Blackout Curtains – Go wider to avoid light gaps.
- Layered Curtains – Sheers + main drape may require separate width calculations.
- Tall Windows / High Ceilings – Fuller drapes help balance vertical height.
How to Measure for Curtain Width (Step-by-Step)
- Measure window width from outer frame edge to edge.
- Decide on the fullness factor based on the desired look.
- Calculate the total width needed.
- Divide by the number of panels you plan to use.
Common Mistakes to Avoid
- Choosing panel width equal to the window width (results in flat, lifeless look).
- Ignoring fullness when ordering custom drapery.
- Forgetting extra width for pleats, lining, or hems.
FAQ
How wide should curtains be for a 72-inch window?
For standard fullness (2×), aim for 144 in total fabric width—two 72-inch panels.
Is 1.5× fullness enough for blackout curtains?
For blackout purposes, 2× fullness is better to block side light leaks.
Should the curtain width include overlap in the middle?
Yes. Include a small overlap (2–4 in) to ensure panels meet without gaps.
