How to Measure Kitchen Window for Curtains Over Sink | Sill-Ready in 4 Steps

A kitchen window over the sink brings its own set of rules. Burning oil, steam, and constant open-and-close motion mean your curtains don’t just need to fit — they need to stay clear of the faucet, survive washing, and look right at half-height. The good news is that café or tier curtains, the most popular style for this spot, use a simple four-measurement system that works the same way for almost any window size. Grab a steel tape and a pencil, and this job takes about ten minutes.

What You Need Before You Start

You already have most of these around the house. The one tool that matters most is a measuring tape — specifically a steel one, because cloth tapes stretch over time and throw off your measurements by a quarter inch or more. You also want a step stool to reach the top of the window trim, a level to keep the rod straight, and your phone’s calculator to add the rod overhang.

• Steel measuring tape (measure to the nearest 1/8th inch — never round up)
• Step stool or ladder for tall windows
• Pencil and paper to record each measurement separately
• Level for straight rod installation
• Phone calculator for rod extension math

Step 1: Decide Where the Rod Goes — Inside or Outside Mount

This choice changes every measurement that follows. An inside mount sits the rod inside the window frame so the curtain sits flush with the glass. An outside mount puts the rod on the wall above and beside the frame, which is the usual choice for sink windows because it keeps the curtain from crowding the faucet.

For a kitchen window over a sink, outside mount is almost always the better call. It leaves the full window opening free for light and airflow, and the curtain hangs outside the sill where it won’t brush against a wet counter or drip into the basin. If your window trim is shallow or you have a deep sill, inside mount can work, but measure carefully — the curtain can’t hang below the sill in that case.

Step 2: Measure Width — Add the Overhang

For an outside mount, measure the full width of the window trim from outer edge to outer edge. Then add 16 to 20 inches total. That gives you 8 to 10 inches of rod sticking past each side of the frame, which lets you pull the curtains fully open without them blocking any glass. A 48-inch window trim, for example, needs a rod between 64 and 68 inches long.

For an inside mount, measure from inside trim to inside trim across the top of the opening. No overhang needed — the rod stays inside the frame.

Step 3: Measure Length — Where the Curtain Stops

This is where most people make the mistake. For café curtains (the half-window style popular over sinks), the standard finished length is between 24 and 36 inches, with short tiers falling between 12 and 24 inches. But you do not just pick a number from that range. You measure from the top of the rod to the window sill, then adjust based on how you hang the curtain.

• Rod pocket (no clips): measure rod top to sill, then add 0.5 inches
• Rod pocket with clips: measure rod top to sill, then subtract 2 inches
• Ring top + tailored pleat with clips: measure rod top to sill, then subtract 2 inches
• Ring top + tailored pleat without clips: measure rod bottom to sill, then subtract 0.5 inches
• Pinch pleat with clips: measure rod top to sill, then subtract 2 inches
• Pinch pleat without clips: measure rod bottom to sill, then subtract 0.5 inches

The key rule: the finished curtain should hover just above the sill or lightly touch it. Anything longer traps cooking grease and gets caught on the faucet handle. If you are adding trim or a decorative hem, subtract an extra 1 inch from your final length number.

Step 4: Choose the Rod and Calculate Fullness

Standard 1/2-inch rods handle windows up to 60 inches wide without bowing. For anything wider — and your measurement from Step 2 might land there — you need a center support bracket to keep the rod straight. A bowed rod makes the curtain sag in the middle and looks sloppy from across the room.

For curtain fullness, multiply your finished rod length by 1.5 to 2. That number tells you the total width of fabric you need. For café curtains, single panels cover half the window width, and double panels split the total evenly. A 64-inch rod with 1.5x fullness, for example, needs 96 inches of fabric total — two 48-inch panels, or one full-width panel if you only want coverage on one side.

Which Fabric Works Over a Sink?

Polyester and cotton blends are the smart pick for kitchen windows. They wash easily, dry fast, and resist the oil splatter that drifts up from the stovetop. Heavy fabrics like velvet or anything with fringe trap grease and require dry cleaning. Machine-washable is the rule here — if you cannot toss it in with the towels, skip it for this spot.

If your kitchen gets heavy cooking use or you prefer low-maintenance cleaning, simple roller blinds or coffee curtains in polyester work better than Roman blinds or gauze, which need partial hand washing or professional care.

Common Mistakes That Ruin the Fit

The most frequent error is measuring the window glass instead of the full rod length. Curtain panels hang from the rod, not the window frame, so ordering panels based on window width leaves them too narrow to cover the sides when closed. The second biggest mistake is mounting the rod at the wrong height for café curtains — if you put it above the halfway point, the curtain covers too little window; below it, the view out the top is blocked.

Rounding measurements to the nearest half or whole inch instead of working in 1/8ths also causes trouble. An extra quarter inch on each side of an inside mount means the rod does not fit at all.

Quick Reference for Café Curtain Adjustments

Wrapping the Measurements Into One Order

Once you have your rod length and adjusted curtain length written down, the whole thing fits into a single shopping list. For a typical 36-inch-wide kitchen window over a sink, that means a 52-to-56-inch rod (36 + 16 to 20 inches), a center support bracket if the rod goes past 60 inches, and two 26-inch café panels at 1.5x fullness. Before you order, confirm the curtain’s finished length from the product description matches the number you calculated — most listings give the drop length in inches, so compare directly against your rod-top-to-sill measurement plus the adjustment for your hanging style. Our tested curtains for kitchen windows over sinks includes specific picks that match these measurements and handle kitchen moisture well.