Table for measuring timber in cubes. Calculation of the volume of lumber

Any construction or repair work with wood requires a painstaking calculation of the required amount of this building material. How to correctly calculate how much to buy this material so that you don’t spend extra money and have enough for everything planned in full? Below is the formula and rules for calculating cubic meters of wood, which will help eliminate even the slightest errors!

What are lumber

What is lumber - perhaps everyone understands. This is a tree already sawn on special equipment.

The process of preparing lumber is always the same:

1. Wood (round timber, i.e. logs) is brought to the sawmill;
2. Next, this primary timber is sorted according to the directions of subsequent processing, in order to eventually obtain a building material from a tree of the required size (length) and cross-sectional area (width + thickness).

You should be aware that timber and any kind of lumber will be measured in cubic meters. According to the construction and mathematical standards, a cubic meter is a three-dimensional square, for the length, width and height of which one meter is taken.

In order to accurately determine whether there are enough wood building materials for a specific construction task, it is necessary to take into account the dimensions of the resulting edged board and the features of its primary woodworking.

Edged timber

This is the most sought-after lumber for construction or renovation, which can be of various lengths and cross-sectional sizes. If you know these sawing parameters, it is easy to find the values ​​\u200b\u200bof how many boards are in a cube.

For example, we received boards 50 x 150 x 6000 mm in the amount of 25 pcs. To calculate how many cubes it is, you can use a special table. There are only three columns, according to the testimony of which it is easy to calculate how many boards are in one cube. Since we have 25 boards, it is easy to find out what cubic footage it is: divide 25 by the value obtained (how many boards are in 1 cube in a table of 6 meters).

Planed timber

Unlike edged timber, which has natural moisture, planed timber is qualitatively dried. As a result of timber drying, its volumes and weight slightly change (decrease):

1. If you use undried wooden lumber in construction, then when they dry, the surface can change its shape (it twisted or bent the beam).
2. The quality and durability of the structure as a whole will depend on how much the building material weighs.

Another difference between planed timber and other types of lumber is a strict regularity in the initial dimensions: the length of the timber section should not exceed 2 times in relation to the width dimension.

planed bar

According to construction GOSTs, there is a certain index by which a bar is distinguished from a bar. This is the section width: if this parameter is greater than 100 mm, then we have a beam, and if the section width is less than (or equal to) 100 mm, we are dealing with a bar.

Edged bar

Edged bar (by analogy with edged timber) is freshly sawn (or without high-quality drying) lumber.

The difference between edged or planed timber / timber is practically conditional, because you can change the width of the material by 2 - 3 cm (and therefore change the status of this material) at the sawmill without any problems.

Professional builders choose timber for the intended use, considering only 3 features:

1. The type of wood from which the beam is made;
2. Drying time of this log house;
3. Features of the building structure (weight load), for the construction of which building materials are selected.

Edged board

This is a kind of lumber with certain dimensions: the width must be 2 times greater than the thickness of the section. The bearing capacity of such a building material is less than that of a bar.

Because their purpose is appropriate:

1. Interior works (floor, roof, walls);
2. External arrangement (fences, siding, construction of outbuildings, etc.).

floor board

According to the dimensions and purpose, there are various types of floorboards (or lining).

Today, the building materials market offers such types of wall paneling, which does an excellent job with sheathing any surface:

1. Parquet - the highest quality and practical properties of this type of flooring are provided by the internal structure in 3 layers: spruce, wood-fiber from conifers and decorative from fruit trees, ash, oak.
2. Terraced - consists of natural wood + some polymers. Differs in high tolerance to humidity, temperature fluctuations, light.
3. Sexual ordinary is a pure wood material. Pine lining is used for arranging floors, walls, ceiling coverings in residential premises. Linings made of aspen or linden are ideal for baths, linings made of larch are used for arranging street buildings (arbors, terraces, etc.).

By quality, lumber for the floor is divided into classes:

1. The highest (or selective) is used only for elite buildings with extremely high wear resistance and reliability;
2. The first and second are applicable for the construction of ordinary housing;
3. The fourth is exclusively suitable for outbuildings.

How to measure

Calculating a sufficient amount of lumber is a responsible task. To calculate how many pieces you need to buy to complete repairs for a specific area of ​​\u200b\u200bthe floor or wall, you should know the cubic footage of these lumber.

The task is not difficult, but pedantic, and begins with calculations for one board:

1. The width, length and thickness of a lumber unit are indicated in millimeters, which should be converted to meters;
2. Multiply the obtained values ​​\u200b\u200b(width x length x thickness) - this is the cubic footage of the board / beam.

Now, in order to estimate how many such boards / bars are in a cube, you need to divide 1 m 3 into the resulting product of the external dimensions of the building material and round up to a whole value. This will be the desired result.

How many boards in a cube: timber table

In order not to waste time on measurements / calculations, you can use a ready-made table. Here, according to the known dimensions of the timber, it is easy to calculate how much timber is in 1 cube and what is the volume of one timber.

How many boards in 1 cube: board table

There is a similar table for boards: knowing in advance (or measuring it yourself) the initial dimensions, it is very easy to find out the volume of a unit of a given building material and how many boards of this size are in a cube.

The formula for calculating the board in a cube in squares

To calculate the surface area, only two indicators are used: length and width. Therefore, in order to calculate the required amount of lumber for work, the cubic capacity of lumber should be converted to square, and compared with the surface area.

Make it easy: 1 m 3 divided by the thickness of the selected unit of building material.

The formula for calculating the board in a cube in pieces

To determine how many boards of a given size in 1 cubic meter, you should:

1 m 3 / board volume (i.e. length x width x thickness)

The formula for calculating the volume of the board

Volume is a three-dimensional quantity. To calculate the volume of the board, you should take the product of width, thickness and length. But, the situation is simplified if you take a meter beam or board. In this case, we multiply only the remaining two values: the thickness and the width of the section.

How many boards in a cubic meter. Memo to the developer

The main feature of the sale of lumber is that they are sold in cubic meters. When buying lumber on the market, it is not always easy to assess the accuracy of its tempering. For this, there are special tables of lumber in a cube. The calculation of the amount of lumber in a cube can be influenced by the degree of processing, type and grade. In one cubic meter there will be a different amount of edged and unedged boards.

Dense and folding cubic meter

In units of lumber, there are two concepts of a cubic meter:

• dense cubic meter;
• folding cubic meter.

A dense measure (cubic meter) is the main method of accounting, based on the laborious method of piece-by-piece measurement of the diameters of the butt and the length of each log.

A folding cubic meter is an auxiliary unit of accounting, for which the parameters of wood are averaged. This method is suitable for off-grade lumber, simplifying the measurement of wood stacks without piece counting. The conversion of a folding cubic meter into cubic meters of a dense measure is carried out using the full-wood factor.

The cubature is a special table for calculating the cubature of lumber. Vertically, the cubature has diameters, and horizontally, lengths. At the intersection of the vertical and horizontal lines, the volume for each log is obtained.

For which lumber can I use the calculation calculator

1. Edged boards and timber. According to the size of a unit of production, volume, area, weight are calculated. The width of edged boards with non-parallel edges is measured in the middle of the length, the thickness of edged boards - in any place, but not closer than 15 centimeters from the end of the board.
2. Unedged board (croaker). The calculator allows you to calculate the cubic capacity, area, weight by the size of one unit.
3. Edged and rounded logs. Calculation of lumber in a cube and volume.

The universal calculator is used to calculate the cubic capacity, moldings and the amount of lumber. With its help, one unit of sawn timber assortment is easily and quickly transferred to another.

Boards and bars of coniferous species are made of six grades, the moisture content of each grade is standardized by GOST. Beech lumber comes in four grades. Medium and large hardwood lumber is divided into four grades. The GOST text contains a table: how much unedged board is placed in a cube depends on its moisture content, as well as on whether it is hardwood or softwood. When humidity exceeds 20%, correction factors must be added to the calculations.

Cubic capacity lumber table

Content:

The seller and buyer of timber pursue their own interests. In such a rather delicate matter, one must have certain - simple - knowledge. Today everyone has a tool: a calculator in the phone.

What is a cubic meter of edged board

How many edged boards in one cube - Photo

Edged board- lumber with cleanly cut edges, without bark residues. The width of the edged board exceeds the thickness at least twice.

Since the fee is charged for the volume in cubic meters, we recall the geometric formula for its definition:

W * H * D = volume.

Everything is in meters.

To find out how many boards are in one cube:

1 / (W * H * D) = number of boards in 1m3 (cube)

where, W- Width, IN- Height, D- Length

Translation: 1mm=0.001m, 10mm=0.01m, 100mm=0.1m

Below is a table of some types of edged boards and their volume

When buying lumber in small quantities, you can get confused with decimal places, namely with rounding. An experienced seller will round the resulting number to the 3rd decimal place. The experienced buyer will round up GOST y - up to 0.000001 cubic meters and remind the seller that up to 0.001 cubic meters. meters are rounded only a batch of boards. The most common quantity - from several boards to 2-4 cubic meters - does not make up a batch. In order not to offend either one or the other, they are rounded to 4 decimal places.

Then the resulting volume is multiplied by the cost of 1 m3 (cube). And here the number of decimal places can significantly affect costs.

1 edged board 32 mm thick, 200 mm wide and 6 m long(32X200X6000) has volume

• 0.032 * 0.2 * 6 = 0.0384 cubes

30 boards will have volume

• 0.0384 * 30 = 1.152 cubes

If the seller rounds the volume of 1 board to 0.04 cubic meters, he will additionally receive income:

• 0.04 * 30 \u003d 1.2 cubes
• 1.2 - 1.152 = 0.048 cubes

Selling these 0.048 "air" cubes makes the buyer's wallet easier

The cost may vary depending on the type of wood. Grading decreases with a decrease in quality: the presence of wood defects and deviations from standard sizes. If the floorboard has a curvature, narrower or thinner than the standard by 3-5 mm, it will not work completely. Visual inspection of the lumber is just as important as accurate sizing.

Edged board area covered

To find out how much lumber you need, the calculation of the board in a cube will help you. The above formula is based on the definition of area

W * D = area.

Having calculated the covered area, it remains to multiply it by the desired thickness of the board

W * D * 0.022; 0.025; 0.032; 0.04m and so on.

It remains to see how many boards are in one cube, and determine the required number. Just in case, print or memorize the table above.

You also need to take into account the future cutting of the material.The floor and sheathing boards "lining" have an overlapping tongue, which is taken into account in the cubature, but is not included in the area to be covered. A couple of boards are needed have in reserve .

Determining the volume of unedged boards

How many unedged boards are in one cubic meter - Photo

Unedged board, that is, not having a rectangular section along the entire length, is much cheaper and is widely used for the installation of various kinds of rough battens, temporary fences.

It is important to understand that the top and bottom of such a board must be sawn along the entire length. If one face is not propylene, then this is already croaker. The definition of the cubic capacity of such lumber differs precisely in that it does not have the correct geometric shape.

The current standards establish several ways to account for unedged material, and it is almost impossible to calculate exactly how many boards are in 1 cube.

1. Batch.
2. Piece by piece.
3. Sampling method.

In batch In this case, the boards are tightly packed into a bag of the correct shape with further measurement. Further calculation is carried out according to the standard formula for determining the volume. using various coefficients.

Piece measurement made according to average measurements of height and width. The largest and smallest dimensions in meters are added and divided in half.

(Wmax + Wmin) / 2 * (Hmax + Hmin) / 2 * L = volume, m3

where, W- Width, IN- Height, D- Length

If it is visually visible that the wood is fresh and, accordingly, damp (humidity above 20%), then the seller is obliged to reduce the total volume by multiplying the received cubic capacity by the coefficient:

• 0,96 for softwood
• 0,95 for deciduous.

Sampling method used to determine the volume of a large batch of unedged lumber. When loading, for example, into the body of a vehicle, every fifth, tenth or twentieth board is measured using the second method.

The resulting volume is multiplied by five, ten, twenty. Loading continues to the next control board. The selection of control boards in a separate foot is also practiced. The calculation is made after the loading is completed.

Calculating the volume of a bar: how much is a bar in a cube?

Calculation of the amount of timber in one cube - Photo

The beam differs from the edged board only in that all its faces or two opposite ones have the same size: more than 0.05 m in thickness and 0.013 m in width. The formula for determining its volume is standard

W * T * D = volume of timber, m3.

To find out how much timber is in one cube

1 / (W * T * D) = amount of timber in 1 m3 (cube)

where, W- Width, T- thickness, D- Length

Translation: 1mm=0.001m, 10mm=0.01m, 100mm=0.1m

When buying a beam, the volume must be determined by the piece, since the beam is laid with spacers in the stack. The measurements of such a stack and the calculation of the cubature according to the above formula invariably lead to a significant overestimation of the volume.

Length of 1 cube of timber (and any edged lumber) in meters is determined by dividing the unit by thickness and width. For example, you need to find out how much timber is in one cube - a face of 180 mm.

1 / (0.18 * 0.18) = 30 meters 87 cm.

1 meter of such a bar will have the following volume.

0.18 * 0.18 * 1 = 0.0324 m3.

These calculations may be needed when determining the cost of funds and material.

Construction log volume: how many logs are in one cube?

How many logs in one cube: calculation - Photo

Log buildings are and will be relevant. The determination of the volume of round material depends on the method of its production.

• Construction log of manual debarking.
• Construction log, rounded on special machines.

The section of the barrel for trimming by hand has the shape of a slightly truncated cone, so the cylinder volume formula is used, but with some peculiarities.

3.14 * r 2 * L = log volume, m3

Here
r- average radius, calculated as (r 1 + r 2) / 2, r 1 - radius from one end of the log, r 2 - radius from the other end of the log.
L- log length.
3,14 - constant "Pi".

The rounded log has, of course, a cylindrical shape and is calculated according to the above formula. But here the radius is measured at any end once. Determining the number of logs in 1 cube is determined similarly to a beam.

1 / (3.14*r2 * L) = Number of logs in 1m3 (cube)

Blanks for construction logs are measured in the same way.

The radius (diameter divided in half) is measured without taking into account the thickness of the tree bark. In practice, manual calculations are not carried out. They use special tables summarized in a cubature book. They are also available in electronic form.

In conclusion, it should be noted that lumber for critical work, standard in size, wood species and humidity, should be purchased at large sites. A small manufacturer, as a rule, is not allowed there due to the lack of appropriate control over the quality of their products.

In the process of private construction, for example, a house, a garage or a summer house, probably not a single builder can do without lumber. Even if the house is being built from the most fashionable and modern materials, it is impossible or economically unprofitable to replace part of the wooden structures, such as rafters, logs, battens, for example, with plastic or metal ones.

To build a small house or bath, you will probably need at least a few cubic meters of lumber of various sizes and sections, from boards to timber and slats. If the construction is large enough, then the wood count is already going to tens of cubic meters.

At a large-scale construction site, usually the number of certain types of boards or timber has already been included in the estimate and builders do not need to calculate whether they will be enough or not for construction, but what about those who build a small house on a limited budget?

If he buys more lumber than he needs, where does the rest go? In order to help these people in the calculation of lumber and their quantity, we decided to write this article. We proceeded from the fact that for small construction projects, lumber is counted either by the piece or by the footage, therefore, in the tables, the cross-section of boards and bars, as well as their length, are indicated in the obligatory size. The volume of a particular lumber in cubic meters is also indicated.

This is done so that a person can calculate the required number of boards or bars in cubic meters, since most of the companies that sell lumber sell them in cubic meters. If you buy, for example, boards by the piece in a hardware store, the final price there will be 1.5 - 2 times higher, which is absolutely unprofitable for the buyer.

In addition, we provided data for the so-called non-standard lumber, because many companies cut wood according to the size of the customer and these dimensions may differ from the standard ones (usually this is dictated by issues of economy or design features of the structure being built).

Indicating the number of lumber in one cube, we gave the number of solid boards or bars, therefore, for the calculation, it is more accurate to use the data on the volume of a particular type of lumber, multiplying them by the quantity.

For private construction, information about the number of boards or bars in one cube is very useful. When buying several board cubes, you will know exactly how many boards are in a given volume, which will also help you count them upon receipt, that is, you will not be deceived with the quantity.

Lumber calculation table

There is no such building that would do without the use of lumber.

Therefore, it becomes necessary to determine their exact number. You can calculate how many boards are in 1 cube using formulas, or you can use ready-made tables. These tables are called cubes.

Note that coniferous wood products are considered here.

What is cubature

In the general case, this is the volume of a body, expressed in cubic measures.

The cubature of lumber is the volume of lumber, expressed in cubic meters, otherwise - in cubic meters or simply in cubes.

Types of lumber

In this section, we will talk about lumber in the order in which they are obtained when sawing a log.

Obapol and croaker

For some reason, confusion arises with the definition of these materials: someone claims that they are one and the same, and someone claims that both are made from croaker.

The proposed table will bring complete clarity.

As can be seen from the table, both fields are not used in construction, so we will not consider it further.

The requirements for the slab are normalized in accordance with OST 13-28-74. And this means that the slab is a full-fledged building material.

The slab is used:

• for subfloor device;
• roof battens;
• formwork manufacturing.

Unedged board

It is propylene on two opposite surfaces, called layers. The edges remain uncut, hence the name.

Its standard dimensions are as follows: thickness - 25, 40 and 50 mm; length - 6 m.

The scope is wider than that of the slab.

It is also used for construction:

• warehouses;
• utility rooms;
• temporary fences;
• canopies.

In addition, it can serve as a base for clapboard lining, block house and other finishing materials.

Edged board

It differs from unedged in that it is propylene along the layers and edges.

Used as:

• roof battens;
• lathing of walls of frame houses;
• racks and braces of frame houses;
• stairs;
• material for the manufacture of country furniture, etc.

bar

This is sawn timber with a thickness of 100 mm or more with a difference in the width and height of the section by no more than two times. Usually the beam is square in section. The most used timber has a section of 100 × 100 mm and 150 × 150 mm.

Used:

• in the construction of frame houses in the form of racks and beams;
• as a material for the outer and inner walls of wooden houses;
• for stairs, railings, etc.

Bar

It differs from a bar in that the maximum size of its section is 75 mm. Like timber, it is most often made with a square section.

Used for interior work such as device:

• stairs;
• railings;
• window sills;
• bases for finishing sheathing;
• roof battens.

How to calculate the number of boards in a cube

Edged board

As is known from the high school course, the volume of a rectangular parallelepiped (and the edged board, timber and bar is exactly that) is equal to the product of the lengths of its sides.

Calculated according to formula 1:

where: V – volume; L - length; b - width; h is the height (in our case, the thickness) of the board.

Having calculated the volume in this way, you can easily find the number of boards in a cube.

To do this, you need to divide the unit by the resulting number (formula 2):

where: N - number of pieces, 1 - 1 cu. m, V - volume.

We should not forget that the dimensions of edged materials are given in millimeters, therefore, before calculating them, they must be converted to meters.

Example

There is lumber with the following parameters:

25 × 150 × 6000, where 25 is the thickness; 150 - width; 6000 - length.

Let's calculate the cubic capacity of the board.

To do this, we convert millimeters to meters and substitute the obtained values ​​​​in formula 1:

V = 0.025 × 0.15 × 6 = 0.0225

Substitute the resulting number into formula 2:

N = 1 ÷ 0.0225 = 44.4

The result is always rounded to whole numbers by discarding the decimal part.

Thus, one cube contains 44 whole boards.

Unedged board

Solving the previous problem in this case is more difficult.

The unedged one has a large difference in width on opposite layers, therefore, when calculating the volume, the average width must be substituted into formula 1: these two widths are added and the resulting amount is divided in half.

The measurement result is rounded up to 10 mm, fractions up to 5 mm are not taken into account, and fractions of 5 mm or more are considered as 10 mm.

In addition, the uncut edges do not allow the board to be stacked tightly, and various scaling factors are applied to calculate the exact volume.

The calculation technique is not so much complicated as tedious, so it's easier to use the table in the next section.

Grooved board and lining

They differ from each other only in size, so the calculation method for them is the same.

They are mounted according to the tongue and groove system, as shown in the figure.

In this case, the so-called “working” or “visible” width is taken as the width b - the distance from the base of the tongue to the edge of the board (see Fig.). It is this size that should be substituted into formula 1.

Tables of the number of boards in a cube

In order not to calculate the quantity and volume each time, special cubic tables were compiled, in which for each size of material its quantity in one cubic meter is given.

4 meter boards

6 meter boards

4 meter beam

6 meter beam

Unedged material

Due to the large variation in dimensions in length, thickness and width, it is impossible to calculate the exact amount of slab in one cube, so there is no cubic table for it.

Here is a table for converting the storage volume of a slab into a dense one.

In this case, we solve the inverse problem: we determine what actual volume a known amount of slab has.

For this you need:

1. Disassemble the slab into debarked (which has the thickest end closest to the root of the tree removed) and undebarked.
2. Sort by length - up to 2 meters and more than 2 meters.
3. Sort by thickness if necessary.
4. Put in a bag, alternating thin and thick ends.
5. Calculate the storage volume of the package.
6. Select the appropriate factor from the table and determine the actual (dense) volume.

Cube for unedged boards.

Cover area calculation

When the main construction is completed, it's time to start finishing work: sheathing the walls and laying clean floors.

To do this, recall formula 1. Calculating the volume of one element, we write the intermediate result - the product:

where S is the area of ​​this element.

Having calculated the amount using formula 2, we multiply the result obtained by the area.

Video

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