How to Measure Blinds: A Simple Guide

Have you ever ordered blinds online, eagerly awaited their arrival, only to discover they don’t quite fit? Measuring windows for blinds might seem straightforward, but a small error can lead to ill-fitting blinds that are frustrating to install and don’t provide the desired light control or privacy. Getting accurate measurements is crucial for a seamless installation and ensuring your blinds look and function perfectly in your space.

Properly measured blinds not only enhance the aesthetic appeal of your home but also save you time, money, and unnecessary hassle. Avoiding remeasurements, returns, and costly alterations ensures a smooth and efficient process, allowing you to enjoy your new blinds sooner. With the right tools and techniques, you can confidently measure your windows and order blinds that are a perfect fit.

What tools do I need and how do I account for inside or outside mounts?

What’s the difference between inside mount and outside mount measurements for blinds?

The core difference lies in where the blinds will be installed: inside the window frame (inside mount) or outside and on top of the frame (outside mount). Inside mount measurements require precise width and height within the frame, allowing the blinds to fit snugly. Outside mount measurements, conversely, need to account for the desired overlap beyond the frame to ensure light blockage and a balanced aesthetic.

For inside mount blinds, accuracy is paramount. You’ll measure the exact width between the inside edges of the window frame at the top, middle, and bottom, using the narrowest measurement. Similarly, measure the height from the top inside edge to the bottom inside edge in three places (left, center, and right), again using the shortest measurement. These precise dimensions ensure the blinds fit neatly within the window opening without rubbing or binding. Manufacturers typically make small deductions from your provided inside mount width to guarantee a perfect fit.

Outside mount measurements offer more flexibility but require careful consideration of overlap. You determine the desired width and height based on how much you want the blinds to extend beyond the window frame on all sides. A common practice is to add 3-4 inches to both the width and height to minimize light gaps and enhance privacy. When measuring for outside mount, consider any obstructions around the window, such as molding or trim, that might interfere with the blind’s installation or operation. Proper overlap ensures optimal light control and a visually appealing appearance.

How do I accurately measure window depth for inside mount blinds?

To accurately measure window depth for inside mount blinds, use a metal measuring tape to measure from the front of the window frame (where the blind will be flush with the wall) to the back of the window frame. Measure at the top, middle, and bottom of the window, and use the shallowest measurement to ensure the blinds fit properly without protruding beyond the frame.

Ensuring you have adequate window depth is crucial for a clean, professional inside mount. Blinds require a certain amount of space to operate correctly, and if the depth isn’t sufficient, the blinds might stick out past the window frame, obstructing the view or looking awkward. The manufacturer’s specifications for your chosen blinds will list the minimum depth required for a flush inside mount. Always refer to those specific requirements as they vary from product to product.

Different types of blinds need varying depths. For example, cellular shades often require less depth than Venetian blinds due to their flatter profile. Plantation shutters generally require the most depth because of their larger louver size and frame. If your window doesn’t have enough depth for your desired blind style, you might need to consider an outside mount instead, where the blinds are mounted on the wall or trim above the window. This will give a clean and complete look.

Here’s a breakdown of why multiple measurements are important:

• Top: Window frames may not be perfectly square due to settling or construction imperfections.
• Middle: Bowing or warping can occur along the frame’s length, impacting the depth.
• Bottom: Similar to the top, the bottom of the frame might differ slightly in depth.

By taking measurements at these three points and using the smallest depth, you’ll avoid ordering blinds that are too deep and won’t fit correctly inside the frame.

Should I round up or down when measuring for blinds?

Generally, for inside mount blinds, you should round down to the nearest 1/8 inch when measuring the width. For outside mount blinds, you typically don’t need to round; use the exact measurement or add a little extra for desired overlap.

For inside mount blinds, precision is key to ensure a proper fit within the window frame. Rounding down allows for a small amount of clearance so the blinds don’t get wedged too tightly inside, preventing smooth operation and potential damage. If you measure, for example, 25 and 3/16 inches, round down to 25 and 1/8 inches. Most manufacturers will then make a small deduction to ensure the blind fits perfectly. It’s far better to have a slight gap than a blind that’s too wide to fit. Conversely, for outside mount blinds, exact measurements (or slight additions) are preferred. Since the blind is mounted on the wall or frame around the window, you want to ensure adequate coverage. Often adding an inch or two to both the width and height provides better light control and privacy. When measuring for outside mount, consider any decorative moldings that might impact the blind’s placement and account for them in your measurements.

What tools do I need to measure blinds properly?

To accurately measure for blinds, you’ll need a steel measuring tape, a pencil, and a notepad. These tools ensure precision and allow you to record your measurements correctly for ordering.

A steel measuring tape is crucial because cloth or plastic tapes can stretch or warp, leading to inaccurate measurements. Precision is key when ordering blinds; even a slight error can result in blinds that don’t fit properly. Always use the same measuring tape for all windows in a single order to maintain consistency.

The pencil and notepad are essential for recording your measurements as you go. Write down the width and height for each window clearly and label each measurement (e.g., “Living Room Window 1 - Width: 36 inches, Height: 48 inches”). It is a good idea to measure each window more than once, recording all measurements, and using the smallest measurement to order your blinds. Double-checking your measurements before placing your order can prevent costly mistakes.

How do I measure for blinds on a bay window?

Measuring for blinds in a bay window requires careful attention to ensure a proper fit. You’ll need to treat each window section of the bay separately, measuring the width at the top, middle, and bottom of each window and using the smallest width measurement. You’ll also need to measure the height of each window individually. Finally, account for any obstructions and consider the desired overlap between blinds, especially at the angles where the windows meet.

When measuring the width, remember to consider the type of blinds you’re installing. Inside mount blinds, which fit within the window frame, will require precise measurements. Outside mount blinds, which attach to the wall above the window, offer more flexibility but still require accurate measurements to ensure proper coverage and appearance. It’s generally recommended to deduct a small amount (usually about 1/4 to 1/2 inch) from the narrowest width measurement when ordering inside mount blinds to allow for smooth operation. This “deduction” is often handled automatically by the blind manufacturer, but it’s crucial to confirm their policy. Pay special attention to the angles where the bay windows meet. Depending on the angles and the type of blind, you may need to reduce the width measurement of the blinds on the angled windows to avoid them colliding. This can be particularly important for blinds with wider headrails or operating mechanisms. Consider using a measuring tool specifically designed for angles to get accurate readings.

How do I account for obstructions like window cranks when measuring?

When measuring for blinds, carefully note the projection of any obstructions like window cranks, handles, or protruding molding. You’ll need to adjust your blind measurements to ensure the blind can operate smoothly without hitting these obstacles. The goal is to provide enough clearance so the blind functions properly, even when the crank is in use.

Consider these obstructions when determining both the width and depth (how far the blind extends into the room) of your blind. For width, measure as usual, but then also measure the distance from the window frame to the furthest point of the obstruction. If the obstruction extends past your initial width measurement, you’ll need to increase your blind width so the blind doesn’t rub against it. For depth, especially with inside mounts, ensure the blind doesn’t protrude so far that it interferes with the crank’s operation. You might need to choose a blind style with a shallower depth or consider an outside mount to avoid interference altogether. In some cases, you can use spacers or extension brackets to push the blinds slightly away from the window, creating additional clearance for the crank. This is especially useful for inside mounts where you want the blind to sit within the window frame but need extra space. Alternatively, consider replacing the window crank with a low-profile version or a folding handle that retracts when not in use; however, this may not always be feasible or aesthetically desirable. Ultimately, prioritize function; it’s better to have a slightly wider or deeper blind that operates smoothly than one that fits perfectly but is constantly hindered by the window crank.

How do I measure the headrail size accurately?

To accurately measure the headrail size for blinds, measure the width across the very top of the existing headrail, end to end, including any end caps or mounting brackets that are permanently attached. This is the exact space the new headrail needs to fit into or cover. Do not measure the window opening itself for headrail size; only measure the existing headrail if you are replacing it, or carefully consider if you are ordering blinds to fit inside the window frame.

It’s important to be precise when measuring the headrail, as this measurement dictates how the blind will fit in your window. Using a metal measuring tape will yield the most accurate results. Make sure the tape measure is straight and level across the headrail when taking the measurement. Record the measurement to the nearest 1/8 of an inch, if possible. Rounding to the nearest half inch is acceptable for many applications, but greater precision often leads to a more professional finished look.

If you’re ordering new blinds and replacing old ones, compare the headrail measurement to the width of the entire blind assembly. Sometimes, especially with older blinds, the fabric or slats extend slightly beyond the headrail itself. Knowing both measurements ensures you order a new blind that fits both the window opening and matches the overall size and appearance of your existing window treatment as closely as possible.

And that’s all there is to it! Measuring for blinds might seem a little daunting at first, but with these tips, you’ll be a pro in no time. Thanks for stopping by, and we hope you found this guide helpful. Feel free to come back anytime you need a little extra help making your house a home!