How Wide Should Curtains Be? Panels & Fullness Explained

Narrow curtains are one of the quickest ways to make a room look cheap. Two flat panels that only just cover the window, even in an expensive fabric, look like a pair of towels. Wide, full curtains have soft folds, frame the window and look like they were made for it.

The width of curtains depends on three things: how wide the rod is, how full you want the curtains to look and how wide each panel is. This guide explains each one with simple formulas and a chart. To get your own numbers in seconds, use the free Curtain Size Calculator.

Step 1: Decide the rod width

Start with the rod, because the curtains are sized to it, not to the window. The rod should be wider than the window so that the open curtains sit on the wall beside the glass instead of in front of it.

Rod width = window width + 2 × the extension on each side.

A good extension is 4 to 8 inches per side. Six inches is a common middle choice: it gives you room to stack the open panels, makes the window look wider and lets in more light. For a window that is 60 inches wide, a 6 inch extension gives a rod of 72 inches.

• Choose a smaller extension (3 to 4 inches) if there is a wall, a corner or another window in the way.
• Choose a larger one (8 to 12 inches) for heavy fabrics that stack deeper, or to make a small window look bigger.

Step 2: Choose the fullness

Fullness is how much wider the fabric is than the rod. It is what gives curtains their folds. Here are the usual ratios:

The thinner the fabric, the more fullness it needs. A sheer at 1.5× looks flat, while a heavy velvet at 3× becomes bulky and hard to stack.

Total fabric width = rod width × fullness. For a 72 inch rod at 2×, that is 144 inches of fabric.

Step 3: Work out the number of panels

Divide the total fabric width by the width of one panel, then round to a whole number. Ready-made panels are usually about 50 or 54 inches wide, and wider ones come in 84 inches.

Panels = total fabric width ÷ panel width.

Continuing the example: 144 inches of fabric ÷ 50 inch panels is 2.9. You can go up to 4 panels (two on each side), which gives a fullness of about 2.8×, or down to 2 panels, which only gives 1.4×. Because panels come in whole units and you want the same number on each side, there is no perfect answer. Our calculator rounds to the nearest even pair and allows up to 10% under your target, rather than making you buy an extra pair for a few inches.

• Pairs. Most windows use two panels that meet in the middle, so the count is even.
• Single panel. One panel that pulls to one side suits a narrow window or a door.
• Wide panels. A panel that is 84 inches wide needs fewer panels for the same fullness, and has fewer seams.

Curtain width chart

Here is a quick guide for a 6 inch extension on each side, 2× fullness and standard 50 inch panels:

With 84 inch panels the same windows need roughly half as many, which is often the better choice for wide windows and sliding doors.

Worked example for a living room window

Take a window that is 60 inches wide in a living room with a standard 8 foot ceiling.

1. Rod width: 60 + 6 + 6 = 72 inches.
2. Fullness: 2× for a medium weight fabric.
3. Total fabric: 72 × 2 = 144 inches.
4. Panel width: 50 inches, so 144 ÷ 50 is about 2.9, which rounds to an even 4 panels (two on each side).
5. The finished fullness is 4 × 50 ÷ 72, or about 2.8×, which looks rich but not bulky.

If you want fewer seams, two 84 inch panels give about 2.3× and cost less.

How wide each side stacks

When you open the curtains, the fabric gathers in a stack. A rough rule is that the stack takes up about one third to one half of the fabric width of each panel, depending on how thick the fabric is. For two 50 inch panels at 2× fullness, expect about 15 to 20 inches of stack per side. Use that figure to decide the extension: if the stack is 18 inches and you want to keep the whole window clear, the rod needs to extend roughly that far past each side of the frame. A smaller extension means some of the open curtain will cover part of the glass, which is fine for privacy but loses light.

Making your own curtains

If you are sewing, add 4 inches for the side hems on each panel (2 inches per side) and a little for the seams where you join fabric widths. Divide the total fabric width by the width of your fabric roll, usually 54 or 60 inches, to see how many drops you need. Tick “making my own” in the calculator and it will show the cut size of each panel.

Common curtain width mistakes

• Measuring to the window, not the rod. The curtains are sized to the rod, so start there.
• Not enough fullness. Two panels at 1× fullness look flat, however nice the fabric is.
• Too much fullness for heavy fabric. It makes the stack deep and hard to open.
• A rod the same width as the window. The curtains then cover the glass when open, and the room looks darker.
• Uneven panels. A pair should have the same number of panels on each side so the window looks balanced.

Next steps

Now that you know the width, check how long curtains should be and how high to hang the rod. For an overview of the whole room, see our curtains for living room guide, or enter your measurements into the Curtain Size Calculator.

Frequently Asked Questions

How wide should curtains be compared with the window?

The rod should be about 8 to 16 inches wider than the window, and the curtains themselves should total 2 to 2.5 times the rod width for a full look.

How many panels do I need for a 60 inch window?

With a 72 inch rod and standard 50 inch panels, four panels (two on each side) give about 2.8 times fullness. Two 84 inch panels give about 2.3 times.

Can I use just two panels?

Yes, if each panel is wide enough. Two 84 inch panels cover most windows up to about 60 inches wide with a good fullness. Two 50 inch panels suit windows up to about 36 inches wide.

What is curtain fullness?

Fullness is the ratio of the total fabric width to the rod width. A fullness of 2 means the fabric is twice as wide as the rod, which creates soft, even folds.