Measuring for curtains might seem straightforward, but getting your measurements right makes the difference between curtains that look professionally fitted and those that appear awkward or ill-fitting. Whether you're ordering ready-made curtains or having them custom made, accurate measurements ensure your window treatments hang beautifully, function properly, and create the polished look you're after. Understanding what to measure, how to measure it, and what allowances to make transforms this potentially daunting task into a manageable project that anyone can master with the right guidance.
Why Accurate Curtain Measurements Matter
The importance of precise curtain measurements cannot be overstated. Curtains that are too short leave an awkward gap above the floor, whilst those that puddle excessively can look messy and gather dust. Width measurements prove equally crucial, as curtains need sufficient fabric to create attractive folds when closed and stack neatly when open without blocking too much window area. Professional-looking curtains create privacy, control light effectively, and enhance your room's proportions, but only when they're measured and fitted correctly.
Beyond aesthetics, proper measurements affect functionality. Curtains that don't reach the floor or overlap sufficiently in the centre allow light to seep through, compromising privacy and your ability to darken the room. Thermal efficiency also suffers when curtains don't fit properly, as gaps allow heat to escape during winter months and enter during summer. Taking time to measure accurately at the outset saves money, frustration, and the disappointment of ill-fitting window treatments.
Essential Tools for Measuring Curtains
Before you begin measuring, gathering the right tools makes the process smoother and more accurate. A metal tape measure proves far superior to fabric versions, which can stretch over time and provide inconsistent readings. Choose a tape measure at least three metres long to accommodate most standard window heights without needing to piece together multiple measurements.
A stepladder or sturdy chair becomes necessary for reaching the top of window frames and curtain poles safely. Never stretch or balance precariously whilst measuring, as this compromises both safety and accuracy. Having a notepad and pencil to hand allows you to record measurements immediately, preventing confusion if you're measuring multiple windows. Some people find it helpful to sketch a simple diagram of each window and note measurements directly onto the drawing.
A spirit level can prove useful when installing curtain poles or checking whether existing poles hang level, though this isn't essential for the measuring process itself. If you're working alone, small pieces of masking tape can temporarily mark measurement points on walls or window frames whilst you verify dimensions. Finally, having a second person to assist makes measuring easier and more accurate, particularly for large windows or bay configurations.
Understanding Curtain Measuring Terminology
Familiarising yourself with standard curtain terminology prevents confusion when ordering or discussing your requirements. The drop refers to the length of the curtain from the top of the heading to the bottom hem. This measurement determines whether your curtains will sit at sill level, below the sill, or puddle on the floor. When you see curtain dimensions listed, the drop always comes first, followed by the width.
Width measurements describe how wide your curtains need to be when fully spread out. This differs from your window or pole width, as curtains require additional fabric to create pleasing folds and fullness. The fullness ratio, typically between 1.5 and 3 times your pole or track width, determines how gathered or flat your curtains will appear when drawn.
The stack back describes how much wall space your curtains occupy when fully open. This measurement matters because curtains drawn back can obscure significant portions of your window, reducing natural light if insufficient wall space exists either side. Understanding stack back helps you position poles and tracks optimally to maximise light whilst maintaining privacy when needed.
Finished width refers to the actual width of the made curtains, whilst flat width means the total width of fabric before any gathering or pleating. Heading types, such as pencil pleat, eyelet, or tab top, affect how you measure and how much fabric you need. Each creates different aesthetics and requires slightly different measuring approaches.
Measuring Curtain Width Correctly
Width measurements begin with your curtain pole or track, not your window. Measure the full length of the pole from end to end, including finials if your pole has decorative ends. If you're measuring for a track, measure from one end bracket to the other, encompassing the entire area where curtains will travel. This measurement forms the basis for calculating how much fabric width you need.
For optimal appearance and functionality, curtains should extend beyond the window frame on both sides. As a general rule, curtain poles should extend 15 to 30 centimetres past the window frame on each side. This overhang allows curtains to be drawn fully back, exposing the entire window and maximising natural light. The extension also creates the illusion of wider windows, making rooms feel more spacious and balanced.
Once you have your pole or track measurement, multiply this figure by your desired fullness ratio to calculate the total curtain width needed. For standard gathered headings, multiply by 2 to 2.5 times the pole width. Eyelet curtains typically work best at 1.5 to 2 times the pole width, as the rings create their own fullness. Sheer or voile curtains often use a higher ratio of 2.5 to 3 times to create luxurious, billowy folds.
Remember that this total width will be split across your curtain panels. For a pair of curtains, divide your total width by two to determine the width needed for each panel. Some windows suit single curtains that draw to one side, whilst others work better with a pair meeting in the centre. Bay windows and very wide expanses might require multiple panels to function smoothly without becoming too heavy or unwieldy.
Determining the Perfect Curtain Drop
Curtain drop measurement requires careful consideration of both practical needs and aesthetic preferences. Start by deciding where you want your curtains to finish in relation to the floor. The most common options include sitting just above the sill, hanging just below the sill, floating approximately 15 centimetres above the floor, kissing the floor, or puddling generously on the floor.
For a contemporary, streamlined appearance, curtains that float just above the floor work beautifully. Measure from the bottom of the curtain rings or the top of the track down to approximately 1 to 2 centimetres above floor level. This length looks clean and modern whilst avoiding fabric dragging on the floor and collecting dust. It's particularly practical in homes with underfloor heating or where curtains need to open and close frequently.
Floor-length curtains that just kiss or break slightly on the floor create an elegant, traditional look. Measure from your fixing point to the floor, then add 1 to 2 centimetres for the curtain to rest gently on the floor without excess fabric. This classic length suits formal rooms and creates a sense of luxury without the maintenance considerations of puddled curtains.
Puddled curtains, where fabric pools on the floor by 5 to 15 centimetres, make a dramatic statement in formal spaces. This opulent style works best in rooms where curtains remain stationary most of the time, as the puddled fabric prevents smooth opening and closing. Puddling also collects more dust and requires regular adjustment to maintain the intentional, elegant puddle rather than an untidy heap.
For sill-length or below-sill curtains, measure from your fixing point to either the sill itself or approximately 10 to 15 centimetres below the sill. These lengths suit kitchens, bathrooms, or windows above radiators where longer curtains would be impractical. However, floor-length curtains generally create more sophisticated, cohesive looks in living spaces and bedrooms.
Accounting for Curtain Headings and Fixings
The type of curtain heading you choose affects your drop measurements significantly. For pencil pleat, goblet, or pinch pleat headings that use hooks attached to rings or gliders, measure from the bottom of the ring or glider to your desired finish point. The curtain hooks then suspend the curtain at the correct height below the fixing point.
Eyelet curtains thread directly onto the pole, with the eyelets sitting slightly above the pole itself. Measure from the top of the pole to your desired finish point, then add approximately 4 to 6 centimetres to account for the eyelet header sitting above the pole. This ensures your curtains hang at the intended length rather than finishing too short.
Tab top curtains loop over the pole, creating a relaxed, casual aesthetic. Measure from the top of the pole to your desired length, adding enough to account for the tabs and the fabric between the top of the tabs and the top of the curtain panel. Ready-made tab top curtains typically account for this, but custom-made versions require careful specification.
Hidden or concealed fixings, such as those used with wave or ripple-fold heading systems, require measuring from the bottom of the track to your desired finish point. These contemporary systems create uniform, flowing folds and the track typically sits close to the ceiling for a sleek, architectural appearance.
Measuring for Different Window Types
Standard rectangular windows prove straightforward to measure, but other configurations require additional consideration. Bay windows, for instance, can be fitted with curtains in several ways. You might install a curtain pole or track that follows the bay's contours, in which case you measure each section of the bay separately and add them together. Alternatively, you might fit curtains across the front of the bay opening, treating it as a single large window.
Arched windows present unique challenges. You can fit curtains at the point where the arch begins, measuring as you would for a standard window at that height. Alternatively, custom-made arched tracks follow the window's curves, requiring professional measuring and installation. Many people choose to fit curtains below the arch, preserving the architectural feature whilst gaining light control for the lower portion.
French doors and patio doors need curtains wide enough to stack back completely on either side, allowing unobstructed access when open. Measure generously for wall space either side, as inadequate stack back creates frustration every time you need to use the doors. Some people prefer separate curtain panels for each door, whilst others opt for a single large panel that draws to one side.
Dormer windows in loft conversions often sit at angles or in recesses, requiring creative solutions. You might fit curtains at the front of the recess, within the recess itself, or use special angled brackets that accommodate sloping ceilings. Each approach requires different measurements and considerations regarding light control and aesthetics.
Common Measuring Mistakes to Avoid
One of the most frequent errors involves measuring the window itself rather than the curtain pole or track. Remember that curtains hang from fixings above and beyond the window frame, not from the window. Always measure from your actual fixing point or planned fixing point, not the window dimensions.
Forgetting to account for obstacles such as radiators, window sills, or furniture can lead to curtains that don't function as intended. Check for anything that might interfere with how your curtains hang or operate. Radiators positioned directly below windows might require shorter curtains or thermal-efficient fabrics that won't compromise heating performance.
Assuming floors are level represents another common pitfall. Many properties, particularly older buildings, have floors that slope or dip. Measure your drop at multiple points across the window width and use the longest measurement to ensure curtains reach the floor across the entire span. Alternatively, follow the floor line for a more relaxed appearance, though this requires careful adjustment during making or fitting.
Measuring in poor light or whilst rushed increases error likelihood. Take your time, measure twice, and work in good lighting conditions. If measurements seem unusual or don't make sense, remeasure before ordering. The few extra minutes spent double-checking pale in comparison to the cost and inconvenience of incorrectly sized curtains.
Recording and Verifying Your Measurements
Developing a systematic approach to recording measurements prevents confusion, particularly when measuring multiple windows. Create a simple chart listing each window by room and location, with columns for pole width, drop measurement, and any special notes. Include details about heading types, fabric preferences, and fixing methods to ensure nothing gets forgotten when ordering.
Always measure in the same units throughout, preferably centimetres for UK curtain suppliers. Mixing measurements in metres and centimetres or switching between metric and imperial increases error risk. Write measurements clearly, using standard abbreviations if needed but ensuring they remain unambiguous.
Before finalising orders, verify your measurements against the room and window. Stand back and visualise where the curtains will hang based on your measurements. Do the proportions look right? Will the curtains clear obstacles? Does the drop measurement account for your chosen heading type? This final check catches errors before they become expensive mistakes.
Consider taking photographs of each window alongside your measurements. Images provide helpful context when discussing requirements with suppliers or when you need to recall specific window details later. Include anything that might affect curtain fitting, such as radiators, light switches, or architectural features.
Working with Professional Curtain Makers
If you're having curtains made professionally, clear communication about your measurements and requirements ensures the best results. Most professional makers provide measuring services, either free or for a nominal fee that's often deducted from the final order. Professional measuring eliminates guesswork and ensures makers have all the information they need to create perfectly fitted curtains.
When providing your own measurements to professionals, be explicit about what you've measured and where. Specify whether measurements are for the pole, the window, or the wall space. Clarify whether you've already accounted for fullness ratios or whether you're providing base measurements for the maker to calculate fabric requirements.
Discuss heading types, lining options, and any special requirements such as blackout capabilities or thermal efficiency. Professional makers can advise on fabric quantities, fullness ratios, and finishing details based on their experience with different fabric types and window configurations. Their expertise proves invaluable, particularly for challenging windows or expensive fabrics where mistakes would be costly.
Ready-Made Versus Custom-Made Measurements
Ready-made curtains come in standard sizes, typically in width and drop combinations that suit common window dimensions. If your measurements fall close to standard sizes, ready-made curtains offer excellent value and immediate availability. However, if your windows sit between sizes, you'll need to decide whether to size up or down, accepting some compromise in fit.
When choosing ready-made curtains, always round up rather than down if your measurements fall between standard sizes. Curtains slightly too long can be hemmed or allowed to puddle, whilst curtains too short leave unsightly gaps. For width, ensure the ready-made size provides adequate fullness by checking the flat width measurement against your pole width.
Custom-made curtains accommodate any measurement precisely but require longer lead times and higher investment. They're worth considering for non-standard windows, expensive fabrics where you want zero waste, or when perfect fitting is paramount. Custom curtains also allow you to specify every detail, from heading type to lining quality and finishing touches.
Achieving Professional Results at Home
Armed with accurate measurements and understanding of curtain terminology, achieving professional-looking results becomes entirely feasible. Take your time during the measuring process, double-check dimensions, and don't hesitate to seek advice from suppliers or professional makers when uncertainty arises. The difference between adequate curtains and outstanding window treatments often comes down to those few extra centimetres measured correctly.
Remember that curtains represent a significant investment in your home's comfort and appearance. Proper measuring ensures your investment delivers maximum impact, creating beautiful, functional window treatments that enhance your living spaces for years to come. Whether you're updating a single room or dressing windows throughout your home, the confidence that comes from accurate measuring transforms the entire experience from stressful to satisfying.
