How to Get the Perfect Curtain Width Every Time

Ever hang curtains that look either cramped or way too bulky? The culprit is almost always the width. Getting the right width isn’t magic—it’s about a few easy calculations and a bit of common sense.

First, measure the actual opening you want to cover. Grab a tape measure and note the distance from one wall edge to the other, not the window frame. This measurement is your bare window width.

Step‑by‑Step Width Calculation

1. Add overlap. Most people want curtains to overlap a little so no light leaks. Add about 10‑15% of the bare width on each side. If your window is 120 cm wide, add 12‑18 cm per side, giving you roughly 144‑156 cm total.

2. Choose a gathering style. The amount of fabric you need depends on how full you want the curtains to look. For a relaxed look, aim for 1.5‑2 times the finished width. For a formal, plush look, go for 2‑3 times.

3. Do the math. Say your finished width after overlap is 150 cm and you want a 2× fullness. Multiply 150 cm × 2 = 300 cm of fabric per panel. If you’re using two panels, each panel should be 150 cm wide.

4. Check the rod. The rod should be wider than the curtains’ finished width. A common rule is to extend the rod 5‑10 cm beyond each side of the window frame. This not only looks balanced but also lets the curtains stack neatly when open.

Practical Tips for Different Rooms

Living rooms. You usually want a softer, more flowing look. Aim for 2.5× fullness and a longer overlap of about 20 cm per side. This creates a luxurious drape that still lets you see the window when open.

Bedrooms. Privacy matters, so a tighter overlap (10‑12 cm) works well. A 2× fullness gives enough body to block light without feeling too heavy.

Bathrooms. Moisture‑resistant fabrics are a must. Keep the overlap minimal—about 5‑8 cm—so water doesn’t pool on the curtains. A 1.5× fullness keeps the look clean and functional.

Another common mistake is buying curtains that are too short for the rod. Measure from the floor up to the rod, then add a few centimeters if you want the curtains to puddle slightly. If you prefer a crisp break, cut the length to just touch the floor.

Lastly, don’t forget to factor in the curtain heading (pocket, grommet, or rod pocket). A rod pocket adds about 2‑3 cm to the width, while grommets add almost none. Adjust your fabric purchase accordingly.

With these steps, you’ll never guess the right width again. Measure, add overlap, decide on fullness, and match your rod—simple as that. Now go pick the perfect curtains and give your windows the look they deserve!