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How to Measure a Sectional

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If you want to take your sitting space to the next level, buy a sectional. These are a better option to maximize your seating space. However, placing and relocating them in a room might not be as easy as you think. In this article, you will learn the correct way about how to measure a sectional and place them correctly.

How to Measure a Sectional

It is necessary to keep the dimensional readings set before you buy a sectional couch. Otherwise, you may bring home something beautiful and realize that it doesn’t fit. Therefore, be alert and learn how to measure a sectional.

Step #1: Assemble the Materials

  • A measuring tape
  • A notebook 
  • A pencil and eraser
  • A newspaper 
  • A scale 
  • A protector 

Step #2: Know the Dimensions 

There are several types of sectional couches with different definitions of dimensions. You won’t find any standardized dimensions because of their customizability.

A living room interior design with a sectional sofa

Here are some commonly used dimensions of a sectional couch. 

  • Length: In the context of a sectional couch, length is an overall value. It is also known as the combined horizontal measurement on the x-axis of the sectional. 

    You can also term it as the distance between two to the right or left arms. On measuring the dimensions, you will get the value around 8 to 13 feet. 
  • Width: Width is also an overall value that you can measure from the back of your couch. In the case of a sectional, it is the measurements of all back components.

    The components along this dimension include arm pieces and the central seat. Usually, you’ll find the width reading of your couch between 7 to 14 feet. 
  • Height: The height of a sectional couch is the distance between the floor and its top-most point. 

Step #3: Measure Your Living Space 

Measure your living space before measuring the dimensions of your sectional couch.

  1. Start your measurement by recording the length followed by width and height.
  2. Use a measuring tape to make an accurate bottom line for your couch. Moreover, the area of your living space decides the size of your sectional. 
  3. After measuring the central area, take the measurements of doorways and hallways.
  4. Also, note down the measurements of all areas through which you need to move your couch. 

If you live in an apartment, try to include the elevator doors. 

Step #4: Cover the Central Area 

The central area should have enough space to hold your couch with extra space. After deciding your main area, whether you want it placed in your bedroom or living room, make sure to tape it. 

  • You can use red painter’s tape to mark the central area on your floor for the time being. 
  • Minimize the central spot by checking couch readings. Now cover the area bounded by the red tape with a newspaper. 
  • However, the measurements of your newspaper need not be accurate. 

Later, you can adjust the spot by visualizing and remarking from different angles. You can remark your area till you’ve found the right one. 

Step #5: Measure the Sectional 

To measure the sectional ultimately, consider the length, breadth, height, and diagonals of your couch. 

  1. Start by measuring the length of your sectional couch. 
  2. Being the longest measurement, the length of your couch is easy to detect. Hook your measuring tape on one side and extend till the last point. 
  3. In the case of “L-type” sectionals, extend the tape through the corner at right angles. 
  4. Take two more readings at corresponding points to evaluate the mean. 
  5. Similarly, find the width of your sectional couch. 
  6. Find the height by hooking the clamp below your finger at the back of your couch.

To evaluate the diagonals, take the reading at the backs of your sectional. 

Step #6: Measure The Central Spot 

Consider any red-tape marker and start measuring the length, width, and diagonals of the squares. 

After taking the measurements, compare the readings with that of your couch. Adjust the markers such that both the measurements become similar. 

Now, set a rug on the central spot and place the sectional above it. Here’s a video guide about how to measure sectionals correctly.

Additional Tips 

  • In the case of L-type sectionals, measure any diagonal followed by the other two. Now, compare the length to find asymmetry in your couch. 
  • In the case of a U-type sectional, measure the three arms separately and add them. You should also consider the blunt corners during measurement. 
  • To ensure enough space, don’t place your L-type sectional against a wall. Keep a minimum distance of 3 feet between your couch and wall. 
  • Use a scale to round off your readings to the nearest centimeter value. Place your scale on edge and note the value at which it intersects with the tape. 
  • Use fabric tape so that measuring the blunt corners remains easy. It would be better if your measuring tape has a lock-in feature for easy hooking. 

Frequently Asked Questions

L-Type or U-Type: Which Sectional Is Better? 

If you want to save some space in your living room, the L-type sectional would be better. However, U-type sectionals are a better option if you want a more spacious couch.

A gray toned sectional sofa with a rug

How Do I Choose the Right Central Spot? 

To choose the right central spot, use your creativity. Take pictures of your room from different angles and imagine. 

How to Calculate the Diagonals of a U-Type Sectional? 

To calculate the diagonals of a U-type, you’ll need a longer scale. Put the scale on the top corner of the backrest and make it the initial point. 


Due to no standardized coordinates, measuring a sectional couch might not be easy. Unlike those recliner couches, sectionals couches have two different lengths. 

The confusion arises when you need two reference scales to measure your L-type. Being mutually perpendicular sections, there is an interchange of length and width axes. 

However, things become easier on a step-by-step approach. Attach to each step to measure any type of sectional couch accurately. After this, it might be easier to fit the sectional through the door or even place a rug within those sectional couches.