How to Measure Windows for Curtains: The Australian Homeowner's Guide

One of the most common mistakes Australian homeowners make when purchasing curtains is incorrect measuring. Curtains that are too short look awkward and unfinished. Curtains that are too narrow don't provide adequate coverage or light control. And curtains that are too long create tripping hazards and collect dust. Getting your measurements right the first time saves money, frustration, and the hassle of returns.

This comprehensive guide walks you through the measuring process step by step, covering different window types and curtain styles commonly found in Australian homes. Grab your metal tape measure (not a cloth one, which can stretch), a notepad, and a step ladder if needed. Let's get started.

Understanding the Key Measurements

Before measuring, it's important to understand the three critical dimensions that determine how your curtains will look and function:

Width: This determines how much wall space your curtains will cover when closed. Proper width ensures complete light blocking and visual balance. Curtains should generally extend beyond the window frame on each side.

Drop (Length): This is the vertical measurement from where the curtain rod or track will sit to your desired finishing point. The drop you choose affects the style and formality of your room.

Fullness: This refers to how much extra fabric width is needed for the curtains to have attractive folds when closed. Sheers typically need more fullness than heavier fabrics.

Step-by-Step Width Measurement

The width measurement process depends on whether you're installing new hardware or working with existing fixtures:

For New Installations: First, measure the width of your window opening from frame edge to frame edge. This is your base measurement. For optimal light blocking and visual appeal, add 15-25cm on each side. This extension, called "stack-back," allows the curtains to sit mostly on the wall when open, maximising your window view and natural light.

For example, if your window opening is 120cm wide, you might install a track or rod that extends from 135cm (allowing 7.5cm stack-back on each side) up to 170cm (allowing 25cm on each side). Wider extensions create a more luxurious look and make windows appear larger.

For Existing Tracks or Rods: Simply measure the full length of your existing hardware from end to end. This is the width your curtains need to cover. Measure from the outermost points, including any corner pieces or end brackets.

Once you have your track or rod width, apply the fullness ratio. Standard fullness for most fabrics is 2 to 2.5 times the track width. So for a 200cm track, you would need 400-500cm of total fabric width. For sheer curtains, increase this to 2.5 to 3 times for optimal billowing effect.

Measuring the Drop (Length)

The drop measurement is where many people make errors. The key is to measure from where the top of the curtain will sit, not from the top of the window frame. This varies depending on your heading style:

Eyelet/Grommet Top: Measure from the top of the curtain rod (not the brackets) to your desired finishing point. The eyelets sit on top of the rod, so the curtain fabric begins about 3-4cm below the rod top.

Pencil Pleat or Pinch Pleat: Measure from the bottom of the curtain track or rod rings. These heading styles typically hang from hooks that attach to the rings or track gliders.

Tab Top or Tie Top: Measure from the top of the rod. Remember that the tabs or ties add extra length above the curtain fabric.

Rod Pocket: Measure from where the rod sits. The fabric encases the rod, so the very top of the curtain will be level with the top of the rod.

Choosing Your Curtain Length Style

Australian homes commonly use three curtain length styles, each creating a different aesthetic:

Floor Length: The most popular choice, where curtains finish 1-2cm above the floor. This creates a clean, tailored look that works in most settings. Floor-length curtains elongate rooms and give a professional finish without the impracticality of fabric touching the floor.

Puddle/Break: Here, curtains extend 2-15cm onto the floor, creating a luxurious, romantic look. This style suits formal living rooms and master bedrooms but requires more fabric and more frequent cleaning. It's not practical in high-traffic areas or homes with pets or young children.

Sill Length: Curtains finish at or just below the windowsill. This traditional style works well for kitchen windows, bathroom windows, or any situation where floor-length curtains are impractical. Add 2-5cm below the sill for a polished look.

Special Considerations for Australian Window Types

Australian homes feature several common window configurations that require specific measuring approaches:

Sliding Glass Doors: These large openings require extra-wide curtain tracks. Measure the full width of the door frame, then add generous stack-back (at least 30-40cm on the opening side) to allow the curtain to clear the doorway when open. Consider using a one-way draw that stacks on a single side.

Bay Windows: Measure each section of the bay separately. For a continuous treatment, you'll need a flexible track that follows the angles. Record the width of each panel and the angles between them. Many curtain retailers offer bay window track solutions.

Corner Windows: Where windows meet at a corner, use a corner track that eliminates the gap. Measure each wall section independently and note the corner angle.

High Windows: In homes with cathedral ceilings or clerestory windows, prioritise accurate drop measurements. Use a laser measure for precision or have a helper hold the tape while you're on a ladder. Record the measurement from track to floor rather than estimating.

Common Measuring Mistakes to Avoid

Learn from others' errors and avoid these frequent measuring mishaps:

• Measuring from the window frame: Always measure from where the track or rod actually sits, which should be well above the window frame for best results.
• Forgetting about the fullness ratio: Flat curtains look cheap. Always order enough fabric for proper fullness when closed.
• Using old curtain sizes: Don't assume new curtains should match old ones. Measure fresh each time, especially if you're changing the track height or style.
• Rounding measurements incorrectly: When in doubt, round up slightly. It's easier to hem slightly too-long curtains than to make short ones work.
• Measuring only one window: Even windows that look identical can vary by several centimetres. Measure each window individually.

Recording and Organising Your Measurements

Create a simple chart for each room with the following information for each window:

1. Room name and window position (e.g., "Living Room - Front Window")
2. Track/rod length needed (or existing track length)
3. Drop measurement from track to finishing point
4. Heading style intended
5. Length style (floor, puddle, or sill)
6. Any special notes (e.g., "needs tiebacks," "corner window")

Take photos of each window for reference when shopping. Include close-ups of any existing hardware and wide shots showing the window in context.

Conclusion

Accurate measuring is the foundation of a successful curtain purchase. By taking your time, understanding the different measurements required, and avoiding common mistakes, you'll end up with curtains that fit perfectly and look professionally installed. Remember to measure each window individually, account for your preferred heading style, and apply appropriate fullness ratios. With this guide and a quality tape measure, you're ready to shop with confidence.