How to Measure for Custom Curtains: A Complete Guide
Measuring for custom curtains comes down to three numbers: rod width, drop length, and fullness. But where you place the tape measure changes depending on your header style—and most guides skip that part entirely.
Once you have your numbers, browse custom curtains cut to your exact measurements. Prefer a second set of eyes? Request free design support.
Measuring for custom curtains isn't the same as picking a standard size off the rack. You're not checking if a 84-inch panel "mostly works"—you're giving exact dimensions so your curtains are cut to fit your window, your rod height, and your preferred look. (If you're still deciding whether custom makes sense for your space, we broke down the costs and tradeoffs here.)
The good part: it's three numbers. Width, length, fullness. Get those right and the rest falls into place.
The part most guides skip: where you start the tape measure changes depending on your header style. A pinch pleat curtain hangs from the bottom of a ring. A grommet curtain hangs from the top of the rod. If you measure both the same way, one of them will be wrong by an inch or more.
This guide walks through measuring for custom curtains step by step, with separate instructions for each header type Freshine offers—so you send numbers that produce curtains that actually fit.
What You'll Need
Grab these before you start:
- Steel tape measure. Not a fabric one. Steel stays rigid across wide windows and won't sag or stretch mid-measure.
- Stepladder. Tall enough to reach your rod height without overreaching.
- Pencil and paper. Write everything down. Do not trust memory.
- Laser measure (optional). Helpful for ceilings above 10 feet, where tape sag becomes a real problem.
One rule before any numbers: measure every window individually. Two windows in the same room can differ by a quarter inch, and with custom curtains, a quarter inch matters.
Before You Measure: Hardware Decisions
Your measurements depend on what hardware you're using and where it sits. Settle these two things first.
Rod vs. Track
A rod is visible, typically round, with decorative finials on the ends. A track is low-profile, often ceiling-mounted, and the curtains glide inside it. The measurement approach differs:
- Rod: Measure the pole only, excluding finials. Curtains hang from rings or grommets mounted on the rod.
- Track: Measure the full track length end to end. Curtains hang from carriers or gliders inside the track.
If you haven't installed hardware yet, decide which type you're using now—it determines every measurement that follows.
Mount Height
Where you place the rod or track sets the vertical starting point for your curtain length.
The standard approach: mount the rod 4 to 6 inches above the window frame. This is safe, balanced, and works in most rooms.
If you want the room to feel taller—and most people do—mount higher. Placing the rod roughly two-thirds of the way between the window top and the ceiling draws the eye upward and makes standard-height ceilings feel more generous. For ceilings under 9 feet, mounting at the ceiling itself (or using a ceiling-mounted track) is often the best move.
Mark your mount points with pencil. You'll measure down from here.
How to Measure Curtain Width
This is the step where most measuring mistakes happen—because people measure the window instead of the hardware.
Your curtains hang from the rod or track, not from the window frame. Measure the hardware.Step 1: Measure the Rod or Track
- For rods: Measure the full length of the pole, excluding finials. That's your rod width.
- For tracks: Measure the full track, end to end.
If you don't have hardware installed yet, measure the window width and add 6 to 12 inches on each side. This extra width—called stack back—gives curtains room to sit beside the glass when open. Without it, your curtains permanently block part of the window.
Step 2: Decide How Many Panels
Most windows use two panels that split in the center and stack to each side. Wide windows sometimes use three or four.
Step 3: Calculate Panel Width by Header Style
How you calculate panel width depends on your header type and its recommended fullness. This is where custom measuring differs from buying standard panels—and it's where most generic guides stop being useful.
The formula is the same across all header styles:
Single Panel Width = (Rod or Track Length × Fullness Multiplier) ÷ Number of PanelsSo for a 120-inch rod with two panels:
At 1.5x fullness: each panel = (120 x 1.5) ÷ 2 = 90 inches
At 2.0× fullness: each panel = (120 × 2.0) ÷ 2 = 120 inches
At 2.5× fullness: each panel = (120 × 2.5) ÷ 2 = 150 inches
2.0× Fullness Group: Grommet Top, Rod Pocket, Ripple Fold and Pinch/Euro Pleat-DoubleThese styles all recommend 2.0× fullness. The fabric gathers or folds to create a balanced, classic look.
2.5× Fullness Group: Pinch/Euro Pleat-Triple and Back TabThese styles use 2.5× fullness, creating deeper, more luxurious pleats or folds.
When ordering custom curtains from Freshine, you don't need to calculate panel widths or fullness ratios yourself. Simply use the Measurement Tool on our website. It walks you through each step—rod width, drop length, and header style selection—and automatically generates the exact curtain dimensions you need.
How to Measure Curtain Length (Drop)
Length is measured from the hardware down to where you want the curtains to end—usually the floor. But the exact starting point changes depending on whether you're using a rod or a track.
Where to Start Measuring
| Hardware Type | Measure From |
|---|---|
| Rod | Top of the rod |
| track | Bottom of the track |
If you have a 2-inch diameter rod with rings that drop 1.5 inches below it, you might worry that measuring from the top of the rod would give you curtains that hang 1.5 inches too long. Here's the key: Freshine's Measurement Tool accounts for this automatically. When you select Pinch Pleat with rings, the tool adjusts the finished length so your curtains hit exactly where you want them—whether that's floating, kissing, or puddling on the floor. You measure from the top of the rod; the workshop handles the rest.
Three Length Styles
Choose one before you measure. Each gives the room a different feel.
The Float (½ inch above the floor).Clean, modern, practical. The hem hovers just above the floor—no dragging, no dust collection. Best for high-traffic rooms, homes with pets, or anyone who prefers a crisp, tailored line.
The Kiss (barely grazing the floor).The designer default. The hem just touches the floor with no visible gap and no extra fabric. Looks intentional and precise. Requires accurate measuring—floors that are off by even half an inch will show.
The Puddle (2-4 inches of extra fabric pooling on the floor).Romantic, luxurious, old-world. Works best with heavier fabrics like velvet or thick linen and in formal spaces where the curtains won't be opened and closed constantly. Not ideal for high-traffic zones or homes with small children.
How to Measure Drop
Mark your rod or track position on the wall. Clip your tape measure at that exact point and measure down to your chosen endpoint. Write down the number.
Now do it two more times: measure at the left edge, the center, and the right edge of where the rod will sit.
Floors and ceilings are rarely perfectly level. If your three measurements are 94½", 94¾", and 94¼", use the shortest for float or kiss lengths—this prevents the curtain from dragging on the high side. For a puddle length, use the longest to ensure enough fabric pools everywhere.
Fullness: How Much Fabric You Actually Need
Fullness is the ratio of fabric width to rod width. It's what turns a flat panel into something with depth and movement.
- 1.5× (minimal): Clean and restrained. Works for modern spaces where the curtain fabric is more about filtering light than making a statement.
- 2× (classic): The standard for most homes. Balanced folds, generous without being heavy.
- 2.5× (luxury): Deep, rich folds. Best with heavier fabrics like velvet or thick linen. Needs more stack-back space when open.
With pleated headers (pinch pleat), Freshine builds fullness into the construction. You use the Measurement Tool to input your rod or track length and header style; the tool calculates the exact panel width and pleat spacing automatically.
A note on stack back: the fuller your curtains, the more wall space the fabric occupies when open. For a 60-inch window with 2.5× fullness, expect roughly 20-24 inches of stacked fabric on each side. Make sure your rod extends far enough to accommodate it.
Special Cases
Extra Wide Windows
For windows wider than 120 inches, a center-support bracket on the rod is standard. If you're using a track system, check weight ratings—wide windows mean more fabric, and more fabric means more weight.
Freshine curtains are made to order up to 360 inches wide (depending on the fabric collection). For anything that wide, provide the exact rod or track measurement. The team will calculate panel splits and seam placements so the finished treatment looks seamless when closed.
High Ceilings and Extra Long Drops
Ceilings above 10 feet often mean curtain drops beyond standard ready-made lengths—which is where custom becomes the only option.
Measure from your mount point to the floor as usual, but use a laser measure if possible. At heights over 10 feet, even a steel tape can bow slightly mid-air, and a half-inch error at the top becomes visible at the hem.
Freshine produces extra-long curtains for drops well beyond standard sizes. Provide your exact drop measurement; the workshop cuts to that number.
Bay and Corner Windows
Treat each flat section of the bay as its own measurement. Measure the width of each pane individually, then measure the angled wall sections between panes. A sketch helps—draw the bay from above and label every dimension.
For a continuous curtain that wraps around the bay, you'll need a custom bent rod or a track system with connectors at each angle. Install the hardware first, then measure along its full path.
Common Measuring Mistakes (and How to Avoid Them)
Measuring the window instead of the rod or track.Your curtains don't hang from the window frame. They hang from the hardware. Always measure the rod or track—or, if it's not installed, calculate the planned hardware width including stack back extensions.
Forgetting stack back.Curtains drawn open shouldn't cover the glass. If your rod barely clears the window frame, the fabric will permanently block light and view. Extend the rod 6 to 12 inches beyond the frame on each side.
Measuring from the wrong point on the rod.Rings drop below the rod. If you measure from the top of the rod but your curtains hang from rings, they'll be short by the ring drop distance. Always measure from the exact point where fabric meets hardware.
Assuming every window in the room is the same size.They almost never are. Measure each window individually.
Not measuring at multiple points.Floors settle. Ceilings shift. Measure drop at the left, center, and right of each window. Use the shortest reading for float and kiss lengths.
Rounding down.When in doubt, round up. A curtain that's slightly too long can be hemmed. A curtain that's too short stays too short.
You've Got Your Numbers. Now What?
You have rod width, drop length, and fullness preference for every window. Those three numbers—plus your header style choice—are everything Freshine needs to cut your curtains to spec.
Custom means no compromising on length because the standard size stops at 96 inches. No buying extra panels to compensate for narrow widths. You give real measurements; the workshop builds to them.
Head to the measuring guide for a printable checklist. If you're unsure about any number, request free design support—a real person reviews your measurements and flags anything that looks off before production starts. Want to see and feel the fabric first? Order free swatches.
FAQ
What if I don't have a rod or track installed yet?Measure the window width, then add 6 to 12 inches per side for stack back. That gives you the planned hardware width. For drop, decide your mount height (typically 4-6 inches above the frame, or higher for taller-looking ceilings), mark it, and measure down to your desired endpoint. Install the hardware before ordering only if you can measure it exactly afterward.
Should I provide measurements in inches or centimeters?Inches, to the nearest ⅛ inch. Freshine is a U.S.-based workshop and all production uses imperial measurements. If you measure in centimeters, convert carefully—rounding errors in conversion are a common source of fit problems.
How much extra width should curtains have beyond the window?The rod or track should extend 6 to 12 inches beyond the window frame on each side. The fabric width should then be 1.5 to 2.5 times the rod length, depending on your preferred fullness. With pleated headers like pinch pleat, you only provide the rod length—Freshine calculates the fabric needed.
Do I need different measurements for blackout curtains?No—measure the same way regardless of fabric. But pay closer attention to rod extension. Blackout curtains are often heavier and stack wider when open, so err toward the upper end of the stack-back range (10-12 inches per side) to keep the glass fully clear. For help choosing the right blackout fabric, see our complete blackout curtain guide.
Can I use the same measurements for every window in a room?No. Measure each window individually. Even identical-looking windows in the same wall can vary by a quarter inch or more. With custom curtains, that difference shows.