# Advice 1: How to calculate population density

In the preparation of various forecasts, along with other measures usually need to know the density of the populationliving on a given territory. It is necessary to find out what human resources has a region now and some will have in a few years, what social institutions are required now and in what quantity, etc.
You will need
• The map of the desired region
• Census data in this region
• Devices for area measurement
• Questionnaires
Instruction
1
When you say that the area is densely populated, it means that in this area of high density population, that is, one square kilometer there is a large number of residents.
2
To calculate the density of the population, it is first necessary to determine the actual area of the territory. This can be done on the map, measure the desired area and using the scale calculate the area of the real territory is the site. If you need to calculate the density of the population in a small area, like a village, summer village or city block, you can simply measure it using the surveying compass, pegs and ropes. Pegs and rope is limited to the desired area, and then conducted measurements. First, check in with local authorities, where are the boundaries of the district or village, and then calculate the area based on these data.
3
Calculate or find information how many people live in the area. This will require data from the latest census of the population. You can use the data published in the directory, but then you have to ensure that the directory was the newest of all. If you want to determine the density of the population, say, in your neighborhood, you can conduct a telephone survey to count the number of residents.
4
Now that you know both, you can go to calculating density. You know the total number of the population in the area, and know the size of the territory. It remains only to calculate how much the average person lives in a unit area. Most often the unit square take the square kilometer. So, take the number of the population N and divide it by the area S, resulting in the density of the population M:
M=N/S.
5
Don't be surprised if the result of the calculation you get fraction. This means that 1 person has 2, 3 or more square meters. For example, the density of the population of one of the regions of Canada is 0.01 persons/km2.
Note
To obtain data on the number of population is not necessary to use the data of the passport. In the passport office there is information about how many people registered on this site. But man does not always live at the place of registration. For a very rough calculation would fit the data.

# Advice 2: How to calculate the number of square meters

To avoid mistakes when buying building materials for a competent and accurate cost estimates, which include all future costs for the proposed repair, you need to know how to calculate the size of the room.
You will need
• - handle;
• - electronic range finder or tape measure.
Instruction
1
Take a long tape measure or electronic distance meter. Using the selected fixtures, measure the width and length of the room. In order to avoid errors and miscalculations, make two measurements along the entire length of the walls, from beginning to end. If the results are different, then calculate the average arithmetic value, adding both numbers and dividing them by two. The result write down in a notebook or Notepad.
2
Multiply the data (length and width) on each other in case, if the room is rectangular, and has no protrusions or recesses. The result is the required area of the room. There is another variant of calculation, to do this, break the room into pieces of rectangular shape, and fold them.
3
Measure the area of the ledges, closets, sanitary units and columns, subtract their size from the result obtained in the measurement area. To do this, calculate the value of all the protruding parts of the room and add them up. From the calculated floor space, subtract the result of adding the square of the projections.
4
Divide particularly difficult areas of the room into triangles and sectors of a circle. In order that would calculate the area of a circle use the formula area of a circle, and to calculate the area of triangle - Heron's formula. For all calculations, use the calculator, it will help to eliminate errors and inaccuracies of the calculation.
Note
When measuring the length of the walls with electronic rangefinder, see that the direction of the rangefinder was strictly perpendicular to the wall. Otherwise, the measurement result is not accurate and very distorted.