How to Measure for Drapery: A Complete Guide

Why drapery is measured differently than shades

If you've already read our window measuring guide, the rules you learned there don't fully apply here. Shades and blinds are measured to fit the window opening or the trim; drapery is measured to fit the rod, and the rod is sized to make the window look its best. That's an aesthetic decision before it's a measurement.

The other big shift: you don't measure fabric width. You measure rod width and finished length, and the workroom applies fullness — extra fabric needed so the panels look full and gathered, not flat. Pre-made panels off a hanger are the one exception, and even there the goal is to combine enough panels to land at the same fullness a custom shop would build.

How to measure drapery width

The width you give the workroom is the rod width — the rod measured end to end (finial tip to finial tip if it has finials). Don't measure bracket-to-bracket; the brackets are sometimes set inboard from the rod ends, which would understate your width. This should be wider than the window itself so the panels stack to the side and don't block any glass when drawn open.

The standard extension is 6–12 inches per side beyond the window edge. Use 6 inches when wall space is tight or the window sits close to a corner. Use 8–10 inches for most living rooms and bedrooms. Use 12 inches or more when you want the window to feel grander, or when the drapery is heavy enough to need real stack space (lined silk, velvet, double-wide panels).

Why so much overlap? Because "stack" — the fabric volume when the panels are pulled fully open — eats wall space. Tailored pleat drapery stacks at roughly one-third of its flat-fabric width. A 60-inch panel takes up about 20 inches of rod when open. If your rod is only as wide as the window, you're losing a third of your glass to drapery stack every morning.

1. Measure the window width from outside edge of trim to outside edge of trim. Record to the nearest 1/4 inch.
2. Add 6–12 inches per side based on the wall space available and how much glass you want exposed when the drapery is open.
3. That total is your rod width. The workroom takes this number and applies the correct fullness for your chosen pleat style.

How to measure drapery length

Length is measured from where the top of the drapery will hang (which depends on the heading style — see below) down to where you want the bottom to finish. There are three standard finish points, and the right one is more about the room than the window.

Sill length stops 1/2 inch above the windowsill. It's the right call for kitchens, bathrooms, and any window with a radiator, baseboard heater, or built-in cabinet beneath it. It's also the safer length in nurseries where a long puddle is a tripping hazard. The look reads tailored and a bit traditional.

Floor length is what most rooms want. The drapery "kisses" the floor with 1/2 inch of clearance — close enough that the panel reads as floor-length but high enough that it doesn't drag when drawn. This is the modern default for living rooms, primary bedrooms, dining rooms, and offices. On hardwood you can go to 1/4 inch clearance; on plush carpet go to 3/4 inch.

Puddle length adds 3–6 inches of extra fabric that pools on the floor. The "break puddle" (3 inches) is a subtle, intentional look that feels luxe without being heavy. The "true puddle" (6 inches or more) is formal and reads as traditional or romantic. Puddle drapery is harder to vacuum around and is best on principal-room windows that don't get opened and closed daily.

After you've taken your length, round down to the nearest 1/4 inch. Drapery is more forgiving short than long — a panel that floats a hair high reads as intentional; a panel that drags reads as a mistake.

Rod placement — where to mount it

Rod height is where most DIY drapery installs lose the look. The classic mistake is mounting the rod right on top of the window trim — clean and obvious, but it shortens the window visually and makes the ceiling feel lower. The fix is simpler than people expect:

When ceiling-mount isn't an option, the fallback is the two-thirds rule: place the rod two-thirds of the way between the top of the window trim and the ceiling. On an 8-foot ceiling with a window topping out at 80 inches, that's roughly 91 inches off the floor — about 11 inches above the trim. The drapery still reads taller than a trim-mounted rod, just not as dramatically as ceiling-mount.

For very tall ceilings (10+ feet), don't run drapery all the way to the ceiling — it starts looking disconnected from the window. Cap rod height at roughly 12 inches above the trim or two-thirds of the trim-to-ceiling gap, whichever is shorter.

Pleat styles and fullness — what the workroom needs from you

"Fullness" is the ratio of flat fabric width to finished rod width. A pleat style with 2.5× fullness needs 150 inches of fabric to cover 60 inches of rod. The workroom handles this math from the rod width you provide — you don't need to calculate fabric — but knowing which style you want changes the price and the look.

Common drapery pleat styles, roughly from least to most fabric-intensive:

• Grommet: ~1.8× fullness. Modern, casual, stacks compactly. The flat-top look reads contemporary and works well on rod-pocket-style rods.
• Rod pocket: ~2× fullness. A sleeve at the top of the panel slides over the rod. Casual and budget- friendly, but harder to open and close.
• Tailored / euro pleat: ~2.5× fullness. Three soft folds at the top, pinched at the very top. The most versatile style — works in modern, transitional, and traditional rooms.
• Inverted pleat: ~2.5× fullness. Pleats face the wall, leaving a flat front. Tailored and architectural. Beautiful in modern rooms with strong horizontal lines.
• Pinch pleat (French pleat): ~2.5–3× fullness. Three folds pinched together with thread. Classic, traditional, hangs precisely. The "designer drapery" look.
• Ripplefold: ~2.5× fullness with carriers on a track. Soft, uniform S-waves. Very modern; pairs well with motorization.

Inside mount vs. outside mount for drapery

Drapery is almost always outside mount — the rod sits on the wall above and beyond the window trim, and the panels cover the trim, not just the glass. That's the look you want 95% of the time.

The exception is inside-mount sheers — a thin tension rod or fixed bracket inside the window opening, holding a single sheer panel against the glass. This is a specialty look for cottage-style rooms, bathrooms, and rooms where the drapery is layered (an inside-mount sheer + an outside-mount overdrape). For inside-mount sheers, measure the window opening exactly as you would for inside-mount shades and order the panel to that width with about 1.5× fullness.

Common drapery measurement mistakes

After hundreds of consultations, these are the mistakes I see over and over on DIY drapery measurements:

1. Measuring the window instead of the rod. Rod width should extend 6–12 inches per side beyond the window. If your panels are sized to the window, the stack blocks a third of your glass every time the drapery is open.
2. Forgetting stack. You need wall space beyond the window for the panels to gather when fully open. A window 4 inches from a corner can't support standard drapery — either skip drapery or go with stationary side panels and a different treatment on the glass.
3. Mounting the rod too low. Right on top of the trim is the universal mistake. The default is at or just below the ceiling; two-thirds of the way up is the fallback when ceiling-mount isn't possible. Either reads better than a trim-mounted rod.
4. Measuring length to the wrong reference point. Length is rod-to-floor (or rod-to-sill), not trim-to-floor. If the rod is mounted 11 inches above the trim and you measured from the trim, your drapery comes back 11 inches short.
5. Underestimating fullness. Ordering pre-made panels at flat-fabric width equal to the rod width gives you a panel that, when gathered, only covers 40% of the rod. Either order custom (where the workroom applies fullness automatically) or buy roughly 2× the rod width in pre-made panels.
6. Rounding length up. A drapery that drags is the most expensive mistake on this list — most workrooms charge to re-hem. Round length down to the nearest 1/4 inch.