How to calculate the volume of a room in m3
- If the room is rectangular, without niches and ledges, then everything is simple: we measure the length, width and height of the room and multiply all three numbers. To get the volume in cubic meters, you need to measure in meters.
- For standard household tasks, accuracy up to a centimeter is sufficient. The result can be rounded up to two decimal places. For example: a room has a length of 5.20 m, a width of 3.43 m and a height of 2.40. Multiply 5.2 x 3.43 x 2.4 = 42.8064. The number can be safely rounded to two decimal places. We get the volume of the room 42.81 cubic meters.
- Even easier if you already know the area of the room. Then it is enough to measure only its height and multiply it by the number you know. Similarly, you can calculate the volume of any rectangular parallelepiped, even a matchbox, even a refrigerator.
How to calculate the volume in m3 if it is not a parallelepiped?
- If the room has niches, ledges, or it itself is of a complex shape, then the task becomes more complicated. It is necessary to divide the space into several parallelepipeds, calculate the volume of each, and then add them up.
By the way: if you know the area of the room, then there will be no complication. Because when calculating the area, everything is already taken into account. So just multiply it by the height of the ceiling.
- In general, you can measure the approximate volume of any object, even the most non-trivial shape, by dividing it into simple rectangular shapes. We measure each separately, calculate the volume for the parts and add up the results. It is clear that such a result will not be very accurate. And the more complex the subject, the greater the error.
What if I want to know the exact volume in m3?
There is a way to find out the volume of any object with high accuracy. But it will only suit you if this thing is not afraid of water and you have a bath of the right size. The fact is that according to the law of Archimedes, a body completely immersed in water will displace an amount of water equal to its volume. That is, it is enough to take a full bath of water, immerse an object in it, collect all the water that spills over the edges and measure its volume in any way possible. For example, using a measuring cup. 
Measuring volume with high accuracy is a rather non-trivial engineering task. But high accuracy is rarely needed in everyday life. And to get an approximate result, you only need a ruler and a calculator.
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