How to Measure Your Windows for Curtains: A Step-by-Step Guide

Measuring for curtains takes about ten minutes per window and one tool: a steel tape measure. (Cloth tapes stretch and lie — don't use one.) Measure every window individually, even ones that look identical; in real houses, they rarely are. Record width first, then length, always in inches.

Step 1: Decide where the rod goes

Before you measure a single window, decide the mount position — it changes every number that follows.

Height: mount the rod 4 to 6 inches above the window trim. For a grander look, go higher — even just below the ceiling line. Never mount it right on the trim; it visually shortens the window.

Width: extend the rod 6 to 10 inches beyond the trim on each side. This lets the panels stack back onto the wall instead of covering th

Step 2: Measure the width

Measure the full rod span — end to end, where the panels will actually hang. Write it down.

Now multiply for fullness. Flat fabric needs to be wider than the rod so it gathers into folds: 1.5x the rod width — minimal, tailored,

Step 4: Note the details

Jot down anything that affects the project: Trim depth and style (deep craftsman trim changes bracket projection). Obstructions: vents, thermostats, furniture that the panels must clear. Which way doors swing near the window. For bay or corner windows, sketch the shape with each section's width.

Common measuring mistakes

Measuring the glass instead of the rod span. The number one error — it produces panels that are too narrow and too short. Forgetting fullness. A panel exactly as wide as the rod looks flat and skimpy when closed. Using a cloth tape. It stretches; your "96 inches" might be 95. Measuring only one window. Builders are human. Measure each one. Ignoring the stack. Panels take up 6 to 10 inches of rod on each side when open — if the rod isn't wide enough, they'll always cover part of the glass.

When to let a professional measure

If your windows are arched, extra tall, or part of a bay; if you're ordering custom drapery (which is made to your exact numbers and generally not returnable); or if you simply want it done right the first time — have the workroom measure. At Arus Design, professional measuring is part of every in-home design consultation, and it's the cheapest insurance policy in the whole project.

Quick takeaways

Measure the rod span, not the glass — then multiply by 2 to 2.5 for fullness. Mount rods 4–6 inches above the trim and 6–10 inches wider than the window on each side. Measure length at three points; floors are never perfectly level. modern. 2x the rod width — the classic standard, full but not fussy. 2.5x the rod width — lush and luxurious, best for formal rooms and heavy fabrics.

For custom drapery, give the workroom the rod measurement and your desired fullness; they'll calculate the cut width. For ready-made panels, add the widths of the panels together and check the total against your target.

Step 3: Measure the length

Hook your tape at the top of where the rod will sit (or the bottom of the rod, depending on your header style — pinch pleats hang below the rod, grommets hang from it) and measure straight down to where you want the hem: Just kissing the floor: the most popular finish. Measure to the floor, then subtract 1/2 inch so the fabric clears it. Breaking slightly: add about 1 inch past the floor measurement for a soft, relaxed puddle at the base. Puddling: add 2 to 4 inches. Glamorous in bedrooms and formal dining rooms; less practical where kids, pets, or vacuums roam. Sill or apron length: for kitchens and bathrooms, measure to the sill or 4 inches below the apron.

Measure length at three points — left, center, and right. Floors slope more than you'd think, especially in older Dallas homes. Use the shortest measurement if the panel must clear the floor, or note the variance for your workroom.e glass, so you keep your view and your light.

Mark these positions lightly in pencil. Your "window" for measuring purposes is now the rod span, not the glass.