How to Measure Curtains: A Practical Guide for Melbourne Homes

Learning how to measure curtains starts with one important distinction: the curtain usually covers more than the visible glass. The track or rod position affects light gaps, stack-back, proportions and how freely the window or door operates. Measuring only the frame can produce curtains that technically fit but do not perform or look the way you expected.

For made-to-measure work, Sun & Shade measures each opening and plans width, drop, fullness and track position together. That professional measure is useful for large windows, sliding doors, unusual frames and layered systems. If you are taking preliminary measurements for planning, the steps below help you understand the numbers that matter.

Step 1: Decide Where the Track or Rod Will Sit

Choose the intended fixing position before measuring width and drop. A ceiling-mounted track creates a different finished height from a rod installed above the architrave. The available wall or ceiling structure, air-conditioning bulkheads, cornices and door clearances may affect what is possible.

Many contemporary installations extend beyond the window so the curtain can stack away from the glass. The exact extension depends on the opening, heading style, fabric volume and available wall space.

Step 2: Measure the Usable Width

If a track or rod is already installed and will remain, measure the usable length of that hardware rather than the window glass. For a new installation, measure the opening and note how much clear wall space is available on both sides.

Take measurements in millimetres for better accuracy and record them immediately. For wide openings, measure twice. Sliding doors also need enough stack-back so the curtain does not obstruct everyday access when open.

Step 3: Understand Curtain Fullness

Curtain fabric is wider than the track because folds require extra material. The amount is called fullness. Different headings use different construction methods, so do not simply double every measurement and assume the result is correct.

S-fold systems, pinch pleats, pencil pleats and eyelets all create different fold geometry. Your curtain maker should calculate the final fabric requirement based on heading, track and fabric. Your job during a preliminary measure is to provide the accurate track or opening dimensions.

Step 4: Measure the Drop

The start point depends on the hardware and heading system. This is one reason professional measuring is valuable: a small error at the top can become a visible error across a full-height curtain.

• Identify the exact point the finished curtain will hang from.

• Measure vertically to the intended finishing point.

• For a floating finish, leave a small clearance above the floor.

• For a touching finish, measurement must be very precise.

• For doors, check floor levels across the full width.

• Measure in more than one position if the floor or ceiling may be uneven.

Step 5: Check Obstructions and Daily Use

Measurements are not complete until you note handles, window winders, heaters, furniture, door swing, power points and any nearby surfaces. A beautiful curtain that blocks a sliding-door handle or piles onto a heater is not a successful fit.

For layered curtains and blinds, also note the depth and position needed for both products. Sheer and blockout layers require track planning so each layer can move without interference.

Common Curtain Measuring Mistakes

When to Use a Professional Measure

Professional measuring is strongly recommended for floor-to-ceiling curtains, wide glass, S-fold tracks, sliding doors, bay-style openings, layered treatments and installations where the fixing surface is uncertain. It is also useful when several windows need to align visually across one room.

Sun & Shade offers free in-home measurement and quoting across Melbourne and surrounding suburbs. The consultation can assess window size, privacy, daylight, stack-back and track position before fabric and heading selections are finalised.

A Simple Measurement Record

For each window, record room name, opening width, intended track width, fixing position, drop at left/centre/right, floor clearance preference, obstacles and preferred heading. Add a photo. This gives your curtain consultant a useful starting point and reduces the chance of mixing up measurements between rooms.

Treat DIY measurements as planning information unless the supplier explicitly asks you to order from them. Made-to-measure curtains are manufactured to specific dimensions, so the final production measure should follow the supplier's own method.

Measure Each Window as a Separate Opening

Even windows that look identical can differ by several millimetres because of building movement, plaster, architraves or floor levels. Do not assume one measurement can be copied across an entire room. Label every opening clearly and photograph it so the measurements remain connected to the correct window.

For a wall with several adjacent windows, also record the total wall width and distances between openings. This helps a consultant decide whether one continuous track or separate treatments will create the better result.

Think About the Finished Curtain Before Measuring

Decide whether you want the curtain to float above the floor, touch the floor or create a longer decorative finish. Think about whether the curtain needs to clear a sliding door, hide a track, sit behind furniture or layer with a blind. These choices change the useful measurements.

Measure twice and write down the raw numbers rather than mentally adding allowances. Fullness, deductions and manufacturing allowances should be calculated by the curtain supplier using the chosen system. Keeping your measurement record 'raw' reduces the chance of allowances being added twice.

Before You Send Measurements for a Quote

Review every measurement for unit consistency and label each one clearly. Add photos showing the full window, surrounding wall and any handles, furniture or doors. Note whether measurements are approximate planning dimensions or final supplier-approved dimensions.

For Sun & Shade customers, preliminary measurements can help describe the project, but the free in-home measure allows the final curtain system to be assessed with the selected heading, fabric, track and installation conditions together.

Frequently Asked Questions

Do I measure the window or the curtain track?

If the track or rod is already installed and will remain, measure the usable hardware width. For new installations, measure the opening and available surrounding space so the track can be planned.

How much wider should curtains be than the window?

There is no single rule because stack-back, heading style and available wall space vary. A made-to-measure supplier should confirm the final track width.

How do I measure curtain drop?

Measure from the correct hanging point for your hardware to the intended floor or sill finish. Check multiple points if the floor or ceiling may be uneven.

What is curtain fullness?

Fullness is the extra fabric used to create folds or pleats. The required amount depends on the heading system and fabric.

Does Sun & Shade measure curtains at home?

Yes. Sun & Shade states that its Melbourne curtain projects begin with a free in-home consultation and measure before final quoting.