Measuring a Room

This article explains how can you measure a room

If you know all the dimensions and measurements of your room, you can edit, customize and improve your room. There can be different additions or renovations that you may do in your room and for that, you need to know all the dimensions, but it all depends upon the purpose and requirement that you have in mind. For instance, if you want to replace the flooring in your home, you need to know the complete area of the floor. If you are unaware how can you measure different dimensions, it can prove to be a difficult task. This article provides some easy steps that you can follow and measure your room.

Read the complete article to learn how to measure your room!

Measuring Floors



Make a drawing of the floor plan in the room you are measuring. [1] You will use this drawing to record your measurements. The drawing does not have to be to scale, but the more accurate it is, the more useful it’ll be.

Since you are just measuring floors, including windows and doorways should not matter.

Include all areas involved in your project. For example, if you’re putting in flooring and have a walk-in closet you are also flooring, draw the closet.

In this hypothetical drawing, there is a bathroom on the right (which is a separate room, so it is not drawn) and a bay window to the left (shown with a half circle).


Measure the length and width of the room’s main area. To calculate the area of a room, use the standard (Length) x (Width) = Area formula. [2] Measure the maximum length and width at the widest points of the room. [3] This is important and will help you get the correct measurements.

Move any items or furniture in the way of your measuring tape.

Having a friend hold the end of the tape could help.

Right now, you are only measuring the main area. Ignore bay windows and separate areas like bathrooms for this step.


Multiply the length and the width to get the main area’s measurement. Use a calculator to ensure this measurement is accurate. For instance, if the room is 12 feet wide and 12 feet long, the area of the floor is 144 square feet. Your result is the measurement of the total floor area. Record this number on your drawing.


Measure the length and width of any square or rectangular recesses. These often include closets or bathrooms that you are part of a flooring or tile project. Measuring square or rectangular recesses is the same as measuring the main area of the room. Measure the width and length of the recess, then multiply the length and width to find the area of the recess.

Write down the result in the recess area of your drawing.

Repeat this step if there are multiple recesses in the room.


Calculate the area of any round recesses. Measure the longest length (usually through the center) and width of the recess. [4] Do not measure further than the edge of the main area you already measured. Next, divide the length by two. Then, multiply this number by the width. Now, multiply the total by pi (3.14). Lastly, divide the area in half.

Record the number in the recess area of your drawing.

Now you have the area of the U-shaped protrusion in the room.

The area in a bay window recess should only be included as part of the area of the room if it has a floor (rather than a seat) and the ceiling is at least seven feet or 2.13 m high.


Add all of the areas together to get the total floor area. Add the areas of all recesses to the main floor area. Now, you have the total square footage of your floor, and you can purchase carpet, flooring, or other materials accordingly.

Measuring a Room’s Perimeter


Measure the length and the width of a square or rectangular room. Use the standard 2(Length) + (Width) = Perimeter formula to find the perimeter of a room. [6] Using a measuring tape, find the length and width of the room.


Add the length and the width, then multiply the answer by two. Use a calculator to make sure your addition and multiplication is accurate. Once you add the length and the width, multiply that total by two. This will calculate the perimeter of the room.


Measure an irregularly shaped room manually. If the room you are measuring is not a square or rectangular, you will need to measure each individual side of the room’s perimeter. Work your way around the room’s perimeter with a measuring tape, recording the length of each side of the room.


Add all the measurements together. Use a calculator to add up every measurement you took of the irregularly shaped room. The result of this calculation is the length of the perimeter of the room.

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