Have you ever tried to buy new curtains online, only to realize you have absolutely no idea what size you need? Or perhaps you’re planning a full window replacement and the thought of mismeasuring fills you with dread? Getting accurate window measurements is crucial for a whole host of reasons, from ordering the right blinds and shades to ensuring a perfect fit for new windows, preventing drafts, and saving you time and money in the long run. A wrongly measured window can lead to ill-fitting treatments, costly return shipping, or even worse, ordering the wrong size replacement window altogether. A few simple measurements done right can save you significant headaches.
Whether you’re a seasoned DIY enthusiast or a complete beginner, understanding how to measure a window correctly is a valuable skill. It’s about more than just getting the width and height; it’s about understanding the different parts of the window, knowing where to measure from, and accounting for any potential obstructions. This guide will walk you through each step, providing clear instructions and helpful tips to ensure your measurements are spot-on every time, regardless of whether you’re measuring for curtains, blinds, or a full window replacement. Accurate measurements guarantee a perfect fit and avoid costly mistakes.
What’s the Difference Between Measuring for Blinds vs. Replacement Windows?
Where exactly do I measure from when determining window width?
To determine window width, measure horizontally from the inside edge of the window frame on one side to the inside edge of the window frame on the other side. This is often referred to as the “inside jamb to inside jamb” measurement.
To elaborate, you’ll be measuring the opening where the window itself sits, *not* the entire window casing or any decorative trim around the window. Imagine the actual space the new window or blind will occupy; that’s the width you need. Use a measuring tape and hold it taut and level for the most accurate measurement. Don’t round your measurement at this stage; record the exact measurement to the nearest 1/8 of an inch. It’s also a good idea to take width measurements in at least three places: the top, middle, and bottom of the window opening. Windows can sometimes be slightly out of square, so variations in these measurements are common. Use the *smallest* of these three measurements as your final width when ordering blinds, shades, or replacement windows. Taking multiple measurements helps ensure a proper fit and avoids any frustrating installation issues down the line.
How do I measure for window depth if I have obstructions?
When obstructions like window cranks, security sensors, or trim prevent a direct measurement of the window depth, use a ruler or measuring tape to measure from the interior of the window frame to the furthest point of the obstruction. Then, measure from the outside edge of the obstruction to the interior surface of the existing window frame. Finally, add these two measurements together to get your total window depth.
To elaborate, accurately determining window depth, also known as jamb depth, is crucial for ordering the correct size replacement window or blinds. When obstructions exist, you’ll need to break down the measurement into manageable parts. First, use a ruler or measuring tape to measure from the interior edge of the window frame to the deepest point of the obstruction. Make sure the measuring tool is level and flush against the frame for the most accurate reading. Note this measurement. Next, measure from the outermost edge of the obstruction back to the interior surface of the window (where the old window glass used to sit or where the new window would sit). Again, ensure a straight and level measurement. Finally, add the two measurements together. This sum represents the total required window depth to accommodate the obstruction without interference. Remember to take multiple measurements at different points along the window, especially if the obstruction is not uniform. This will help you identify the maximum depth required. If your measurements vary, use the largest measurement to ensure proper fit. Consider taking photos to document your measurements and the location of the obstructions, which can be helpful when consulting with a window professional or ordering your materials.
What’s the best way to ensure accurate measurements for angled windows?
The best way to ensure accurate measurements for angled windows is to create a template of the window opening. A physical template allows you to capture the precise angles and dimensions that are difficult to achieve with just a tape measure, minimizing errors and ensuring a perfect fit for blinds, shades, or other window coverings.
Creating a template involves using a flexible material like cardboard, builder’s paper, or even thin wood strips. Carefully trace the inside of the window opening onto the template material, paying close attention to the angles. For unusually shaped windows, consider using a combination of straight pieces taped together to follow the contours precisely. Label the template clearly with the window’s location and any important details, such as which side faces the interior of the room.
Once the template is complete, double-check its accuracy by holding it up to the window opening again. Make any necessary adjustments before sending it to a professional window treatment provider. Many providers prefer templates for angled windows as they provide a tangible and accurate representation, leading to fewer remakes and greater customer satisfaction. This method is far superior to relying solely on measurements with a tape measure, which can easily introduce errors when dealing with non-rectangular shapes.
Should I measure from the inside or outside of the window frame?
Whether you measure from the inside or outside of the window frame depends entirely on what you’re measuring *for*. Generally, for replacement windows, you’ll measure the inside dimensions of the existing frame. For blinds, shades, or curtains, you’ll likely measure the inside of the frame (for an inside mount) or the outside of the frame (for an outside mount).
For replacement windows, the critical measurement is the opening within the existing frame. This is because the new window unit needs to fit precisely into the space left by the old one. Measuring the inside dimensions, from jamb to jamb (the vertical sides) and from head to sill (the top and bottom), gives you the “rough opening” size. Always measure the width and height in at least three places (top, middle, and bottom for width; left, center, and right for height) and use the smallest measurement to ensure a proper fit. It’s generally advised to subtract about ¼" from these measurements to allow for shimming and adjustments during installation. When measuring for window treatments like blinds or shades, the location of your measurements depends on the type of mount you prefer. An inside mount gives a cleaner, recessed look. In this case, measure the inside width and height of the window frame. For an outside mount, which makes the window appear larger and can block more light, you’ll measure the outside width and height of the frame, or even extend beyond it, depending on your desired coverage. Consider the overlap you want when measuring for an outside mount.
How many times should I measure to get the most precise dimensions?
You should measure the window opening at least three times, both horizontally (width) and vertically (height), in different locations. This helps identify any inconsistencies or variations in the opening, which are common, and allows you to use the smallest measurement to ensure a proper fit. It is more important to identify and account for these variations than just taking a single reading.
Taking multiple measurements at different points accounts for the reality that most window openings aren’t perfectly square or rectangular. Walls can bow slightly, framing can shift over time, and even small imperfections in construction can accumulate. By measuring at the top, middle, and bottom horizontally, and again on both sides vertically, you gain a comprehensive understanding of the opening’s true shape. Record all measurements meticulously. When ordering a replacement window or determining dimensions for blinds or curtains, always use the *smallest* of the multiple measurements you’ve taken. This ensures that the window or covering will fit within the opening without being too large. Remember the old adage: you can always add shims to fill a small gap, but you can’t easily make something smaller! Precision and consistent methodology in measurement are key to avoiding costly mistakes and ensuring a professional-looking installation.
What is the proper way to measure for window treatments vs. window replacement?
Measuring for window treatments focuses on the visible window and surrounding trim to ensure proper coverage and aesthetic fit, while measuring for window replacement demands precise measurements of the window frame opening itself to guarantee a new window fits snugly and seals correctly within the existing structure.
When measuring for window treatments, accuracy is still important, but some flexibility exists. Consider whether you want the treatment to hang inside the window frame (an inside mount) or outside the frame (an outside mount). For an inside mount, measure the width of the window frame at the top, middle, and bottom, and use the smallest measurement. Also, measure the height from the top of the inside frame to the bottom. For an outside mount, decide how far beyond the window you want the treatment to extend on each side and above and below the window opening, then add those extensions to the window frame dimensions. Remember to account for any obstructions like window cranks or alarms. For window replacement, precision is paramount. Measure the width and height of the window opening from the inside, jamb to jamb (the inner sides of the window frame). Take three measurements for both width and height – at the top, middle, and bottom for width, and left, center, and right for height. Use the *smallest* of the three width measurements and the *smallest* of the three height measurements. These are the critical dimensions needed to order a window that will fit properly in the rough opening. It’s also important to note the window’s depth, measuring from the interior trim to the exterior trim to ensure the replacement window has the correct profile. It’s highly recommended to have a professional take these measurements for replacement, especially if the window opening isn’t square.
Do I need to account for any gaps or clearances when measuring a window?
Yes, you absolutely need to account for gaps or clearances when measuring for replacement windows or window coverings. Measuring the exact opening size without considering these allowances will likely result in a window or covering that doesn’t fit properly.
For replacement windows, the measurements you take are typically used to order a window that is slightly smaller than the opening. This slight reduction in size, usually around 1/4 to 1/2 inch overall, is essential for a few reasons. It allows for easier installation, providing wiggle room to maneuver the new window into place. It also provides space to shim the window, ensuring it’s level and plumb within the opening. This shimming is critical for proper operation and weather-tight sealing. Finally, the space is filled with insulation to create an energy efficient and weathertight barrier.
Similarly, when measuring for blinds, shades, or curtains, consider the desired fit (inside or outside mount) and the manufacturer’s specifications. Inside-mount coverings require precise measurements, but still need a small clearance to operate smoothly and avoid rubbing against the window frame. Outside-mount coverings are more forgiving, as you can adjust their placement to cover the entire window area. Always check the manufacturer’s instructions for the specific deductions they will make based on your measurements to ensure a proper fit.
And that’s it! Measuring a window doesn’t have to be daunting. Hopefully, this guide has made the process a little easier and you’re now ready to find the perfect fit. Thanks for reading, and be sure to check back for more helpful tips and tricks around the house!