You will need
  • construction roulette;
  • - the electronic rangefinder.
To measure the square footage (area expressed in square meters) of rectangular shape, multiply its length and width. The width and length of the room it is necessary to record in meters. If the number of meters when measuring a non-integer (i.e., there are measurement and centimeters), attribute number Santimeters after the decimal point with a comma). So, for example, measure 1 meter 23 centimeter will match the number 1.23.
If the room tabs or niches from the other rooms, the square footage is calculated separately and subtracted or added to the rectangular area of the room. However, note that the protrusions from plumbing installations (eg. risers) should not be subtracted from the square because they are square – even if it is the device for General use.
To measure the number of square meters in a non-rectangular room, divide it into rectangles and fold the yardage of each of them. Of course, this method is suitable only in the case when all of the additional corners of the room direct.
When measuring the length and width of the room, use a regular construction tape measure or electronic distance meter. To get a more accurate result, take two measurements – different parts of the wall. If the measurements differ, then find the arithmetic average – add up and divide both measurements in half.
When used for measurement of square footage room electronic (laser) roulette pay special attention to the direction of the beam should be exactly perpendicular to the wall. Even a deviation of a few degrees is able to numerate the extra square meter.
If the square footage of the apartments is calculated with the purpose of installation of heating system "warm floor" on the basis of infrared heating film, then subtract from the obtained square meters square stationary furniture (sofas, beds, cabinets, walls and kitchen tables).
If the room has a complex shape, break difficult sections into triangles and sectors. To calculate the square footage of a triangle, measure its sides and use Heron's formula:Treugolnika = √(p * (p-a) * (R-b) * (p-C)), where R - properietor of the triangle, i.e., R=(a+b+C)/2, where a, b and C be the lengths of its sides. To calculate the area of a sector use the formula for the area of a circle (PR Kvadrat), and then multiply the resulting value by the number of degrees in the sector and divide by 360.