This measuring guide is demonstrated using metres. However, it works equally as well for those who are more familiar with feet and inches. Using the same principles as shown below, but using measurements in feet, you will soon discover how many square feet you have to cover.
How to measure square metres of a room
If your room is a rectangular or square shape just measure the length and the breadth of the room. Then multiply them together and there’s your answer!
So for example, if your room is 4.6 metres long and 3.4 metres wide then you just make the following calculation.

4.6m X 3.4m = 15.64 Square Metres
The best way to measure other less straight-forward areas, like hallways etc, is to think of them as a collection of squares and measure them as such.
So for example, if your area is a more difficult space to measure, break it down into squares and make the following calculations.

Part A: 3.0 X 2.0 = 6.0 square metres
Part B: 3.4 X 1.2 = 4.08 square metres
Then add the two totals together: 6.0 + 4.08 = 10.08 Square Metres
TIP – A person of average height taking an extra-long stride, without being uncomfortable, should cover 1 metre with each step. So, if you are not
fully confident that you have measured your room correctly using the tape measure, as a double check, stride across the room counting how many
steps it takes and compare it with your measurement.