Nine times out of ten, curtains look wrong for one reason: the measurements. Not the fabric, not the price tag. A modest panel hung at the right height and width looks better than an expensive one that hangs too short, too narrow, or too low.
Maren Drapery · Curtain Guides · Updated October 2026
Measuring for curtains takes about five minutes and needs only two numbers. The catch is that both numbers are easy to get wrong in ways that aren't visible until the curtains are already on the rod.
This guide walks through the process in the order you should actually do it, because the decisions you make first — where the rod goes, how the curtains hang — change every measurement that follows.
The short version
- Install the rod first, then measure. Measure the rod, not the window.
- Hang the rod 4–6 inches above the window frame and extend it 3–6 inches past each side.
- Total curtain width should be 2 to 2.5 times the rod length.
- Measure length from the point where the fabric actually hangs, down to where you want the hem to end.
What you'll need before you start
- A metal tape measure. Not a cloth sewing tape. Fabric tapes stretch, and a half inch of stretch over a wide window becomes a visibly wrong curtain.
- A pencil and something to write on. Record every number the moment you take it.
- A step stool. Most of these measurements are taken at ceiling height, not eye level.
- Painter's tape to mark bracket positions before you drill.
- Your curtain rod, or a firm decision about where it will go. Ideally, install the rod before you measure.
Step 1: Decide where the rod will hang
This is the step people rush, and it's the one that determines everything else. Curtain measurements start at the rod, so you can't measure anything meaningful until you know where the rod is going.
Height: hang higher than feels natural
Most people mount a rod an inch or two above the window frame. It's technically correct and visually wrong. It makes the window look small and the ceiling look low.
As a baseline, hang the rod 4 to 6 inches above the top of the window frame. For a taller, more deliberate look, go higher, up toward the ceiling or crown molding. In rooms with high ceilings, mounting the rod near the ceiling is usually the better choice, even if that's 10 or 12 inches above the frame.
Width: extend past the frame on both sides
Extend the rod 3 to 6 inches beyond the window frame on each side as a standard. If you want maximum daylight when the curtains are open, or you're trying to make a narrow window read wider, push it to 8 to 12 inches per side.
Why it matters: the extension is where the curtains stack when they're pulled open. If the rod ends at the frame, the panels sit over the glass and block light even when fully open.
| Goal | Rod height above frame | Rod extension each side |
|---|---|---|
| Standard, tidy look | 4–6 inches | 3–6 inches |
| Taller-looking window | 8–12 inches, or just below ceiling | 6–10 inches |
| Maximum light when open | 4–6 inches | 8–12 inches |
| Blocking light at the edges (bedrooms) | 6–8 inches | 8–12 inches |
Mark the bracket positions with painter's tape and step back. Look at the marks from across the room before you commit.
Step 2: Measure the width for proper fullness
Here's the confusion that causes more bad curtain purchases than anything else: rod width and curtain width are two different numbers.
Rod width is the hardware. Curtain width is the fabric. They are never the same number, and the fabric number is always bigger.
Measure the rod from one end to the other, outside edge to outside edge, at the height the rod will actually sit. This is your rod width. Then multiply it for fullness — the amount the fabric gathers on the rod when the curtains are drawn.
The industry standard is 2 times the rod width in total fabric. A 60-inch rod needs about 120 inches of total curtain width, which in practice means two 60-inch panels. If you want a richer, more formal drape, go to 2.5 times. For sheer curtains, 2.5 to 3 times is normal because the fabric is see-through and needs more depth to read as full.
| Rod width | Total fabric at 2× (standard) | Total fabric at 2.5× (fuller) |
|---|---|---|
| 36 inches | 72 inches (2 × 36" panels) | 90 inches |
| 48 inches | 96 inches (2 × 48" panels) | 120 inches |
| 60 inches | 120 inches (2 × 60" panels) | 150 inches |
| 72 inches | 144 inches (2 × 72" panels) | 180 inches |
| 96 inches | 192 inches (2 × 96" panels) | 240 inches |
Two panels per window is standard. On very wide openings, three or four panels distribute the weight better. If your panels meet in the middle, a slight overlap of 4 to 6 inches looks more professional than panels that barely touch.
The most common width mistake
Buying two standard panels and assuming they'll cover the window. A pair of 52-inch panels gives you 104 inches of fabric, which is only enough for a rod up to about 52 inches at full 2× fullness. Measure the rod first, then check the math, then choose the panel count.
Step 3: Measure the length
Length is measured as a "drop": the distance from where the fabric hangs on the rod down to where you want the hem to land.
Measure from the hook point, not the top of the rod
The fabric does not start at the top of the rod. It starts where the curtain attaches: at the eyelet of a ring, at the hook on a pleated header, or at the top of the fabric for a rod pocket panel. That gap can be 1 to 2 inches. If you measure from the top of the rod and your curtains hang from rings, your curtains will come up short by exactly that gap.
Once you know your starting point, decide where the hem should end. There's no single right answer, but there are five established styles.
| Style | Where the hem falls | Best for | How to measure |
|---|---|---|---|
| Sill | At or a half inch above the windowsill | Kitchens, bathrooms, windows above counters | Rod to sill, minus ½ inch |
| Apron | 4 to 6 inches below the sill | Small windows, guest rooms | Rod to sill, plus 4–6 inches |
| Floor (float) | About ½ inch above the floor | Living rooms, bedrooms — the most versatile choice | Rod to floor, minus ½ inch |
| Break (kiss) | Just touching the floor | Hiding slightly uneven floors | Rod to floor, plus 1–2 inches |
| Puddle | Fabric pooling on the floor, 2 to 6 inches | Formal dining rooms, traditional interiors | Rod to floor, plus 3–6 inches |
If you're unsure, floor-length is the safest choice and the one that suits most rooms. Curtains that stop at the sill make a room feel shorter, which is charming in a kitchen and disappointing in a living room.
If you're buying ready-made, panels come in set lengths: 63, 84, 95, 96, 108, and 120 inches. Measure your drop, then round to the nearest standard size, leaning longer if you're between sizes. This is exactly where made-to-measure curtains win, because there's no rounding to a stock size that doesn't quite match your window.
Step 4: Account for your header style
The header is how the fabric attaches to the rod, and it changes both your starting point for length and how much fabric you need.
| Header style | What it does to your measurements |
|---|---|
| Grommet | Metal rings are set into the fabric and slide directly onto the rod. There's usually 1 to 1.5 inches of fabric standing above the rod. Measure from the top of the rod, and note that the grommets add a visible header height. |
| Rod pocket / back tab | The rod is encased in a fabric sleeve or held by a strip at the back. The fabric top sits at roughly the rod height. Measure from the top of the rod, and account for the rod's diameter so the fabric doesn't bunch too tightly. |
| Rings and clips | The clip adds 1 to 2 inches below the rod before the fabric begins. Measure from the eyelet of the ring, not the rod. This is the single most common source of curtains that turn out an inch too short. |
| Pinch pleat / pencil pleat | The heading is gathered, so it consumes fabric and adds structure at the top. Hooks are often adjustable by an inch or more, which gives you a little correction room. Measure from the intended hook position. |
If your curtains will be lined or blackout, add a heavier rod with a center support on wide windows. Three layers of lined fabric over a wide span will bow a lightweight rod, and a bowed rod is visible immediately.
How made-to-measure changes the math
Everything above applies whether you buy ready-made or custom. The difference is what you have to do with the numbers.
With ready-made panels, you compromise: you round your drop to the nearest stock length, you buy two panels and hope the combined width clears your rod at 2×, and you accept whatever header the panel came with.
If you would rather skip the arithmetic, our made-to-measure blackout curtains are cut to your exact numbers. Send us three things and we handle the fabric allowance, the stack tuck, and the hem for your exact window:
- Your rod or track width (measured as in Step 2)
- Your finished drop (measured as in Step 3, with the hang style you chose)
- Your header style and mount type
Free size check before you order
If you're unsure whether your numbers are right, send them over. We'll check the fullness, the stack allowance, and the drop against the style you want, and tell you if anything looks off before the fabric is cut. It's easier than discovering the problem on the day the curtains arrive.
Frequently asked questions
How wide should curtains be for my window?
Total fabric width should be 2 to 2.5 times the rod width. A 60-inch rod needs roughly 120 to 150 inches of combined panel width, which normally means two panels plus a slight center overlap. Sheers usually need more, around 2.5 to 3 times, because a see-through fabric needs extra depth to look full.
How high should I hang the curtain rod?
Mount it 4 to 6 inches above the top of the window frame as a baseline. For a taller, more dramatic look, go higher — up to just below the ceiling or crown molding. Hanging the rod higher makes the window and the walls read as taller, and it's one of the few changes that costs nothing.
Should curtains touch the floor?
It depends on the effect you want. A half inch above the floor ("float") is the most practical and the most common choice. Just touching the floor ("break") softens the look and hides slightly uneven floors. Puddling 2 to 6 inches of fabric on the floor is formal and dramatic, but harder to maintain. Sill and apron lengths are better for kitchens and bathrooms, where floor-length fabric would be in the way.
How do I measure for blackout curtains?
The measuring process is identical to any other curtain. The differences are practical: blackout fabric is heavier, so plan for a sturdier rod with a center support on wide windows, and extend the rod further past the frame on each side (8 to 12 inches) so no light leaks around the edges. Fullness of 2 to 2.5 times matters more here, because a flat blackout panel lets light slip through the gaps between folds. See our blackout curtains for rod and lining options.
How many curtain panels do I need?
Two panels per standard window is the default. Once your rod is wider than about 72 inches, go to three or four panels so the fabric isn't stretched thin and the weight is distributed evenly. Divide your total required fabric width by your chosen panel width to get the count — then round up to an even number, since panels are normally made and sold in pairs.
Ready to order curtains that actually fit?
Every panel we make is cut to your measurements — no rounding to a stock size, no compromising on fullness. Tell us your rod width and your drop, and we'll handle the rest.