French doors originated in France in the XVI-XVII centuries and have become a timeless trend and a popular solution for exterior and interior applications. They strengthen the human connection with nature and fill the living space with light.
Such models are characterized by glass inserts, the number and size of which can be absolutely different (glass panels usually occupy at least 80% of the slab surface). However, before buying French doors, it is essential to determine the necessary size. Below, we will provide full information about the dimensions of interior doors and step-by-step instructions on how to measure them so that the installation is accurate and error-free.
Standard French door sizes
Our product range includes interior French doors in a variety of sizes to ensure that every customer finds the right option.
Single interior French doors
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Nominal height: 80, 84, 92 ½, and 96''.
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Nominal width: 18, 24, 28, 30, 32, and 36''.
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Thickness: 1 ¾ and 1 9/16''.
The most popular slabs are 30 x 80, 36 x 80, 30 x 84, and 36 x 84 inches.
The table shows the standard sizes of Belldinni single doors.
Double interior French doors
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Nominal height: 80, 84, 92 ½, and 96''.
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Nominal width: 36, 48, 56, 60, 64, and 72''.
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Thickness: 1 ¾ and 1 9/16''.
The most popular slabs are 60 x 80, 72 x 80, 60 x 84, and 72 x 84 inches.
The table shows the standard sizes of Belldinni double doors.
To order a non-standard-sized French interior door, please consult our specialists.
French door rough opening size
Accurate measurements ensure that the correct size interior door is chosen and installed precisely to prolong the life of the door unit.
Note that there is a formula that helps determine the ratio of slab dimensions to doorway size:
The doorway should always be 2'' wider and 2-½'' higher than the door slab.
An example of the calculation for single French doors is shown in the table.
Height 80
Height 84
Height 92 ½
Height 96
Door size
Rough Opening
18 x 80
20 x 82 ½
24 x 80
26 x 82 ½
28 x 80
30 x 82 ½
30 x 80
32 x 82 ½
32 x 80
34 x 82 ½
36 x 80
38 x 82 ½
Door size
Rough Opening
18 x 84
20 x 86 ½
24 x 84
26 x 86 ½
28 x 84
30 x 86 ½
30 x 84
32 x 86 ½
32 x 84
34 x 86 ½
36 x 84
38 x 86 ½
Door size
Rough Opening
18 x 92 ½
20 x 95
24 x 92 ½
26 x 95
28 x 92 ½
30 x 95
30 x 92 ½
32 x 95
32 x 92 ½
34 x 95
36 x 92 ½
38 x 95
Door size
Rough Opening
18 x 96
20 x 98 ½
24 x 96
26 x 98 ½
28 x 96
30 x 98 ½
30 x 96
32 x 98 ½
32 x 96
34 x 98 ½
36 x 96
38 x 98 ½
Similar calculation rules apply for double swing doors.
How to measure French doors?
We have prepared step-by-step instructions that will help every homeowner correctly measure the dimensions of the interior door. To do this, study our guide, get the necessary tools, and allocate time for this task.
The tools you need
Most likely, you have everything you need for the measurements in your home:
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Tape measure.
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Paper.
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Pen or pencil.
The most visual and convenient way to record the measurement results is to draw a model of the door and plot the data obtained on it.
Preparing the area
Initially, you must ensure full access to the door frame, so clear the space around it before measuring (remove furniture and obstructing decorative elements). In addition, make sure that the door frame is free of any defects that could affect the measurements' accuracy.
Door width measurement
Here, you will need to take three measurements and then, if they are different from each other, write down the largest one on paper:
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Place a tape measure on top of the door frame and measure the width from the left edge to the right edge.
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Repeat the action in the middle of the door opening.
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Repeat at the bottom.
Door height measurement
This step also requires three measurements for accuracy and recording the highest value as the base one:
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Place a tape measure on the floor or threshold on the left side of the opening and measure the height of the casing to the point where it meets the door frame.
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Repeat the action in the middle of the doorway.
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Repeat on the right side.
Door depth measurement
If necessary, measure the width of the door frame in several places. This information may be helpful when ordering French interior doors for your home or apartment.
FAQ
In this section, we have compiled answers to frequently asked questions to make the door sizing process as easy and straightforward as possible for you.
Practical aspects to be taken into account
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The interior door frame and the slab are installed in the rough opening. Note that the door will be half an inch larger than its actual size.
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To calculate the width of a single swing door, add 2 inches to your largest measurement. If you are installing a double swing configuration, multiply your measurements for a single slab by 2 and then add 2 inches as well.
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To properly calculate the door height, add 2-½ inches to your measurements.
Let's look at an example. Let's say that after taking your measurements, you have obtained that the width of the opening is 44 inches and the height is 90 inches. Thus, you should install interior French doors of the following dimensions:
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Width: 44+2=46'' (for double French doors: (44*2)+2=90''.
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Height: 90+2-½=92-½''.
Conclusion
We recommend double-checking each measurement to ensure you are choosing the right size Belldinni French Interior doors. Our website offers a convenient configurator with which you can place an order, considering all the parameters.
Also, our experts are always happy to assist you in finding the perfect solution for any interior design.