How To Calculate Room Areas

It is not the sole responsibility of engineers to know how to calculate room areas. Sooner or later, you will realize you badly need to learn how to do this, too. So, before that thing happens, learn now how to calculate room areas. Just imagine, you will be asked how big your room's floor is when buying carpets or air conditioning system. You will prevent yourself from buying too much or too little if you only know the exact measurement of your room area.

What is Area?

Generally, area describes the size of a figure or shape. Not only rooms can be described based on area. Even other things like computer screens, towns, basketball gym, fields, countries, cities, and even the size of your fingernail are measured through areas.

Calculating the area is more like counting how many squares there are in a given shape. In this case, that shape is your room's floor.

Getting a room's area is quite easy because you only need to get the product of the room's length and width. In mathematics, that is equivalent to Area = length X width.


Here's how you should calculate a room's area using the formula given above:

  • Measure. Get the measurement of the room's length and width. Use the same metric system. For instance, if you measured the length by feet, then measure the width by feet also. Using different scales will give you inaccurate calculation.
  • Compute. The measurement you have acquired can already describe how big the room is. For instance, it can be 5 feet X 10 feet. But this is not still the room's area. Simply multiply 5 and 10 and the product is the area. In this case, the room is 50 square feet.

This way of calculation is only applicable for rectangular-shaped rooms. What if your room has a smaller portion? Instead of a rectangle, your room included another small rectangle? For that, the following should be done:

  • Measure. This time, measure the deepest and widest parts of the wall. And then, get the width and depth of the smaller rectangle. Let's say, the bigger rectangle measures 5 feet X 10 feet and the smaller rectangle measures 2 feet X 3 feet.
  • Calculate. Get the area of both rectangles-big and small. In the example above, the area of the bigger rectangle is 50 square feet while the smaller rectangle is 6 square feet. Now, subtract the area of the smaller rectangle from the bigger rectangle. That should be 50 - 6 = 44. Therefore, the room's area is 44 square feet.

Besides using feet, you can also calculate the room area by square meter. For bigger areas, square kilometer is usually used. Smaller areas like a sheet of paper are measured with square centimeter. Smallest areas can use square millimeter. Other scales of measurement can be used for this like square inches, square decimeter, square miles, or square acres.

These steps are not only helpful for calculating the room area. You can also use the measurement to measure other things like your custom table or bed, your bedroom, the garden, the living room, and your computer screen. The same steps will be used but you'll most probably end up using a different scale.


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