Measuring Windows for Perfect Blackout Curtain Fit

When it comes to measuring windows for blackout curtains, many people struggle to get it right. This is often due to a lack of understanding of the various fact...

Mason Jul 25, 2026
the instructions for how to measure windows
the instructions for how to measure windows

When it comes to measuring windows for blackout curtains, many people struggle to get it right. This is often due to a lack of understanding of the various factors that need to be considered, such as the size of the window, the type of curtain, and the desired level of darkness.

the instructions for how to measure windows
the instructions for how to measure windows

Measuring Your Window for Blackout Curtains

How to measure your windows for drapes
How to measure your windows for drapes

The first step in measuring your window for blackout curtains is to determine the size of the window. This involves taking precise measurements of the width and length of the window opening. To do this, you will need a tape measure and a pencil. Start by measuring the width of the window from one side to the other, taking note of any obstructions such as window handles or locks.

Next, measure the length of the window from the top to the bottom, again taking note of any obstructions. It is essential to get these measurements as accurate as possible, as this will affect the fit and functionality of your blackout curtains.

Measuring the Curtain Height (Length)
Measuring the Curtain Height (Length)

Measuring for Different Types of Windows

When measuring windows with unique features, such as bay windows or skylights, you will need to take these into account when taking your measurements. For example, if you have a bay window, you will need to measure the width and length of each section separately, as well as the width of the window at the point where the bay section meets the main window.

How to Measure Windows for Curtains with an Easy Measuring Guide and Rod Tips
How to Measure Windows for Curtains with an Easy Measuring Guide and Rod Tips

Similarly, if you have a skylight, you will need to measure the width and length of the skylight, as well as the surrounding area to ensure that your blackout curtains cover the entire opening.

Considering the Type of CurtainChoosing the Right Blackout Curtain

Once you have your measurements, you will need to choose the right type of blackout curtain to fit your window. This will depend on the size of your window, the level of darkness you require, and the style of your room. For example, if you have a large window, you may want to consider a blackout curtain with a motorized system to make it easier to open and close.

an info sheet showing how to measure the width of windows and what they are used
an info sheet showing how to measure the width of windows and what they are used

When selecting a blackout curtain, you should also consider the material and the level of light blockage it provides. Some blackout curtains are designed to block out 99% of light, while others may only block out 50%. It is essential to choose a curtain that meets your needs and provides the level of darkness you require.

Measuring for Different Types of Window Openings

When measuring windows with unique features, such as windows with multiple sashes or windows with a unique shape, you will need to take these into account when taking your measurements. For example, if you have a window with multiple sashes, you will need to measure the width and length of each sash separately, as well as the width of the window at the point where the sashes meet.

Imperial Rooms IR | Curtains | Bedding | Duvets | Rugs | Online Store
Imperial Rooms IR | Curtains | Bedding | Duvets | Rugs | Online Store

Similarly, if you have a window with a unique shape, you will need to measure the width and length of the window, as well as the surrounding area to ensure that your blackout curtains cover the entire opening.

Measuring for Blackout Curtain Rods

how to measure the height and width of a window with measurements for each window opening
how to measure the height and width of a window with measurements for each window opening
Measure Curtains Like a Pro | Fast, Accurate Guide
Measure Curtains Like a Pro | Fast, Accurate Guide
the measurements for an open window and curtain rod
the measurements for an open window and curtain rod
30 Different Types of Curtains Unraveled (Curtain Couture Guide)
30 Different Types of Curtains Unraveled (Curtain Couture Guide)
7 Proven Steps to Get Curtain Measurements Right
7 Proven Steps to Get Curtain Measurements Right
Standard Curtains Sizes and How to Measure for Curtains
Standard Curtains Sizes and How to Measure for Curtains
Ultimate Guide: How to Choose the Perfect Size Blackout Curtains for Bedrooms & Living Rooms
Ultimate Guide: How to Choose the Perfect Size Blackout Curtains for Bedrooms & Living Rooms
Pair of Supersoft Navy Plain Thermal Eyelet Curtains - Navy / 137cm / 117cm
Pair of Supersoft Navy Plain Thermal Eyelet Curtains - Navy / 137cm / 117cm
How to measure your windows for drapes
How to measure your windows for drapes

Once you have measured your window, you will need to choose a blackout curtain rod that fits your window. The rod should be the correct size to accommodate the width of your window, and should be made of a material that can support the weight of the curtains. For example, if you have a large window, you may want to consider a rod that is made of a sturdy material, such as aluminum or wood.

When choosing a blackout curtain rod, you should also consider the style of your room and the level of darkness you require. Some blackout curtain rods are designed to be more decorative, while others may be more functional.

Installing Blackout Curtain Rods

Installing blackout curtain rods is a relatively straightforward process that requires a few basic tools. You will need a drill, a screwdriver, and a level to ensure that the rod is installed correctly. Start by drilling holes in the wall at the desired height, then screw in the rod brackets. Finally, attach the rod to the brackets and adjust the curtains to the desired level of darkness.

It is essential to follow the manufacturer's instructions for installing the rod, as well as any local building codes or regulations.

Finalizing Your Measurement

Once you have measured your window and chosen the right type of blackout curtain, you can finalize your measurement by taking note of any obstructions or unique features of your window. This will help you to ensure that your blackout curtains fit perfectly and provide the level of darkness you require.

With a little patience and attention to detail, you can ensure that your blackout curtains are installed correctly and provide the level of darkness you need to get a good night's sleep or create a comfortable and relaxing atmosphere in your home.

Remember, measuring your window correctly is the key to ensuring that your blackout curtains fit perfectly and provide the level of darkness you require. Take your time, and don't be afraid to ask for help if you need it. With a little practice, you'll be measuring windows like a pro in no time, and enjoying the benefits of a good night's sleep or a comfortable and relaxing atmosphere in your home.

Visual guide

the instructions for how to measure windows
the instructions for how to measure windows
How to measure your windows for drapes
How to measure your windows for drapes
Measuring the Curtain Height (Length)
Measuring the Curtain Height (Length)
How to Measure Windows for Curtains with an Easy Measuring Guide and Rod Tips
How to Measure Windows for Curtains with an Easy Measuring Guide and Rod Tips
an info sheet showing how to measure the width of windows and what they are used
an info sheet showing how to measure the width of windows and what they are used
Imperial Rooms IR | Curtains | Bedding | Duvets | Rugs | Online Store
Imperial Rooms IR | Curtains | Bedding | Duvets | Rugs | Online Store
how to measure the height and width of a window with measurements for each window opening
how to measure the height and width of a window with measurements for each window opening
Measure Curtains Like a Pro | Fast, Accurate Guide
Measure Curtains Like a Pro | Fast, Accurate Guide

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