How to Measure Curtains So They Hang Right
June 28, 2026
Curtains that fit look intentional. Curtains that are too short or too narrow look like an afterthought. The good news is that measuring for them takes about five minutes and one tape measure. Here is how to get the width and length right the first time.
Start with the rod, not the window
Mount the rod higher and wider than the window itself. Most rooms look better when the rod sits 4 to 6 inches above the window frame, and taller ceilings can take more. Raising the rod draws the eye up and makes the window feel larger.
For width, extend the rod 3 to 6 inches past each side of the frame. That gives the panels somewhere to sit when they are open, so they frame the glass instead of covering it. Measure the full rod width once it is mounted, since that is the number your curtains need to cover.
Getting the width right
Flat panels look thin. For a gathered, full look you want the combined panel width to equal about 2 to 2.5 times the rod width. A 50 inch rod wants roughly 100 to 125 inches of total curtain across both panels.
- Light, sheer fabric: aim for the higher end, around 2.5 times, since thin fabric needs more gather to read as full.
- Heavier blackout fabric: 2 times the width is usually enough.
- One panel or two: two panels that meet in the middle are easier to open and close than a single wide panel.
Choosing the length
Measure from the top of the rod down to where you want the hem to land. There are three common lengths:
- Sill length: the hem stops at the windowsill. Good for kitchens, bathrooms, and anywhere a long panel would get in the way.
- Floor length: the hem just kisses the floor, with about a half inch of clearance. This is the standard look for living rooms and bedrooms.
- Puddled: the panel runs a few inches long and pools on the floor. It reads as formal and suits heavier fabrics, though it collects more dust.
When in doubt, go floor length. Short panels are the most common mistake, and they are hard to fix after the fact.
A quick worked example
Say your window is 36 inches wide and you mount a rod that ends up 48 inches across, set 5 inches above the frame. For a full look you want about 100 to 120 inches of total curtain, so two panels of 52 to 54 inches each. If the rod sits 90 inches off the floor and you want floor length, your panels need to be about 89 inches long from the hook down.
What to shop for
Once you have your numbers, the fabric sets the mood of the room. For privacy and better sleep, look at blackout and thermal curtains, which also help with drafts. For soft daytime light, sheer and net curtains filter the sun without blocking it, and you can layer the two on a double rod to get both. Browse the full range of curtains and drapes, and do not forget the rods, rings, and hardware that hold it all up.
Common mistakes to avoid
- Hanging the rod at the top of the window frame. It makes the ceiling feel lower and the window smaller. Go higher.
- Buying panels the same width as the rod. They stretch flat and look skimpy. You want roughly double the rod width in fabric.
- Stopping the hem above the floor. Short curtains are the giveaway of a rushed job. Floor length or just below is the safe call.
- Forgetting the header type. Grommet, rod pocket, and pinch pleat each hang at slightly different heights, so measure from where the fabric actually starts.
