Getting ready for construction frame house, erecting the roof and assembling the crowns of the log house, the developer has to purchase timber.
This material is used to make various wooden structures, therefore its assortment includes dozens of items. To eliminate errors, you need to determine as accurately as possible how much timber is in a cubic meter.
The “mathematical model” of this operation is simple. To calculate the volume of any rectangular object, its length is multiplied by its width and height. However, in practice, when purchasing large quantity lumber of different lengths and cross-sections, you can get confused and overpay a considerable amount.
In this article we will talk about the important nuances of calculating the volume of lumber and provide easy-to-use “cheat sheets” for converting linear meters of timber into cubes.
Be careful at the timber warehouse!
Considering high cost edged timber, its purchase must be taken responsibly. Sellers, as a rule, use the price per 1 m3. Customers at checkout rafter system roofs, wall frames, floor beams and floors receive linear meters. Additional confusion is caused by production length standards, which range from 3 to 6 meters (0.5 meter increments).
It’s not difficult to sort everything out in this matter. Let's say that for construction you need a beam with a cross-section of 100x50 mm, and its total length is 100 linear meters (l/m). To calculate the volume of edged wood, you need to convert the cross-sectional area from millimeters into square meters and then multiply them by the length: 0.1x0.05x100 = 0.50 m3. We get the price of a given amount of timber by multiplying its volume by the cost of one cubic meter.
And here is another one no less important question: how to control the amount of lumber that the seller gives you? Here you need to take into account not only the cross-section, but also the length of the material.
Let's say that we need a beam 4 meters long (total length 100 l/m). In this case, the volume of one piece will be equal to: 0.1x0.05x4 = 0.02 m3. Dividing the purchased amount of material (0.5 m3) by the volume of one bar (0.02 m3) we get exactly 25 pieces.
In practice, round numbers are rare, so the required amount of timber is most often a fraction. We will not give to the seller that part of the lumber that remains after the comma. It’s better to pay him up to a whole number of beams.
Let's look at an example. Buy 63 linear meters timber (section 100x180 mm, length 6 meters). We calculate the purchase volume: 63x0.1x0.18 = 1.134 m3. We divide it by the volume of one beam (0.1x0.18x6 m/p = 0.108 m3). We get 1.134/0.108 = 10.5 pieces. The seller will not cut half of the timber for us. Therefore, when calculating, you need to pay him up to the whole amount and take 11 beams.
With profiled timber, the cross-section of which is complex shape, do the same as with the usual one. To determine the cross-sectional area of a given material, its total height (the distance from the bottom edge with the groove to the top mark of the tenon) is multiplied by the width.
Counting the amount of timber in the warehouse in 1 m3, take a tape measure and measure the actual cross-section of the purchased material. It may turn out that instead of the 100x200 or 150x150 mm promised by the seller, they delivered thinner material. Even a 1 centimeter reduction in the transverse size of a saw log results in significant losses for the buyer.
Another important nuance– technological deviation of beam length. It can reach 5-7 centimeters, since the ends of the logs are not cut off during processing. Remember that the seller does not have the right to add these extra centimeters to the total length.
Tables for quickly calculating the volume of timber
Using a calculator to count how many pieces of timber are in a cube is not always convenient, especially when purchasing a large batch. The seller's data can be easily controlled using ready-made tables. Here for standard sizes lumber provides information on the volume of 1 timber and the number of pieces in 1m3.
Table for calculating edged timber 6 meters long
| Dimensions (mm) | Volume of 1 piece (m3) | Pieces per 1 m3 |
| 100x100x6000 | 0,06 | 16 |
| 100x150x6000 | 0,09 | 11 |
| 100x180x6000 | 0,108 | 9 |
| 100x200x6000 | 0,12 | 8 |
| 150x150x6000 | 0,135 | 7 |
| 150x180x6000 | 0,162 | 6 |
| 150x200x6000 | 0,18 | 5,5 |
| 180x180x6000 | 0,1944 | 5 |
| 180x200x6000 | 0,216 | 4,5 |
| 200x200x6000 | 0,24 | 4 |
| 250x200x6000 | 0,3 | 3 |
This table can also be used when purchasing 3-meter timber. To do this, the volume of 1 piece must be reduced by half, and the amount of material in one cube must be multiplied by 2.
Let us recall that timber, by definition, is lumber with a thickness and width of 100 mm or more. Therefore, we deliberately did not include in the table the dimensions of wooden blanks of smaller cross-sections in order to maintain formal accuracy.
Let's look at the data on the volume and number of boards of common sizes in a separate table:
| Dimensions (mm) | Volume of 1 piece (m3) | Pieces per 1 m3 |
| 25x100x6000 | 0,015 | 66,6 |
| 25x150x6000 | 0,0225 | 44,4 |
| 25x200x6000 | 0,03 | 33,3 |
| 40x100x6000 | 0,024 | 41,6 |
| 40x150x6000 | 0,036 | 27,7 |
| 40x200x6000 | 0,048 | 20,8 |
| 50x50x6000 | 0,015 | 66,6 |
| 50x100x6000 | 0,03 | 33,3 |
| 50x150x6000 | 0,045 | 22,2 |
| 50x200x6000 | 0,06 | 16,6 |
| 50x250x6000 | 0,075 | 13,3 |
To calculate the volume and quantity of 4-meter timber, you can use the following cheat sheet:
| Dimensions (mm) | Volume of 1 piece (m3) | Pieces per 1 m3 |
| 100x100x4000 | 0,04 | 25 |
| 100x150x4000 | 0,06 | 16,66 |
| 100x180x4000 | 0,072 | 13,88 |
| 100x200x4000 | 0,08 | 12,5 |
| 150x150x4000 | 0,09 | 11,11 |
| 150x180x4000 | 0,108 | 9,26 |
| 150x200x4000 | 0,12 | 8,33 |
| 180x180x4000 | 0,13 | 7,69 |
| 180x200x4000 | 0,144 | 6,94 |
| 200x200x4000 | 0,16 | 6,25 |
| 250x200x4000 | 0,2 | 5 |
As can be seen from the table, almost the entire range of beams here is fractional. Therefore, for an economical purchase, you should use our advice on paying the seller up to the whole amount of timber.
How to do this practically? Let's give an example. Let's say that we bought one cubic meter of 4-meter timber with a cross-section of 100x180 mm (according to the table, it turns out to be 13.88 pieces). The price of 1m3 is 6500 rubles. Up to 14 pieces of beams we need to pay an additional 14-13.88 = 0.12. The volume of this “piece” is (0.12 x 4 meters = 0.48 m) x 0.1 x 0.18 m = 0.00864 m3. We multiply it by the price of 1 m3 and get 0.00864 m3 x 6500 rubles. = 56.15 rub.
Remember that the purchased volume of bars must include a reserve (cutting losses during operation). Therefore, the result obtained during the theoretical calculation of the roof truss system or other wooden structure must be multiplied by a factor of 1.3. After this adjustment, you can begin settlements with the seller.
In addition to determining the volume and price of the purchased material, you need to know the weight of 1 m3 of timber in order to order transport of the appropriate carrying capacity.
The weight of a cubic meter of timber depends on the type of wood and its moisture content. The approximate weight of 1 m3 of dry pine is 510 kg (wet - 890 kg).
The average weight of one cube of dry spruce bars is 450 kg (wet - 790 kg).
The weight of dried oak wood is in the range from 700 to 800 kg/m3, and wet (freshly cut) – from 980 to 1030 kg/m3.
Dry larch timber weighs 650 kg/m3. Freshly cut material of this type of wood weighs 840 kg/m3.
In the process of private construction, for example a house, garage or cottage, 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, joists, lathing, for example, with plastic or metal ones.
To build a small house or bathhouse, you will probably need at least several cubic meters of lumber of various sizes and sections, from boards to beams and slats. If the construction is large enough, then the timber count already amounts to tens of cubic meters.
At a large-scale construction site, usually the number of certain types of boards or timber is already included in the estimate and the builders do not need to calculate whether they will be enough or not for the construction, but what should those who build small house on a limited budget?
If he buys more lumber than he needs, what will he do with the rest? In order to help these people in calculating lumber and their quantity, we decided to write this article. We proceeded from the fact that for small construction projects the counting of lumber is carried out either piece by piece or by footage, therefore the cross-section of boards and beams, as well as their length, are required in the tables. The volume of specific 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 companies that sell lumber sell them in cubic meters. If you buy, for example, boards individually at a hardware store, the final price there will be 1.5 - 2 times higher, which is absolutely unprofitable for the buyer.
Additionally, we provided data for so-called non-standard lumber, because many companies cut timber according to customer sizes and these sizes may differ from standard ones (usually this is dictated by issues of economy or design features of the structure being constructed).
When indicating the amount of lumber in one cube, we gave the figure for solid boards or bars, so for the calculation it is more accurate to use data on the volume of a specific 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. By purchasing several board cubes, you will know exactly how many given volume boards, which will also help you count them upon receipt, that is, you will not be deceived with the quantity.
Lumber calculation table
|
Boards |
||
| Board size | Number of boards in 1 cube | Volume of wood in 1 board, cubic meters |
| 25 x 100 x 6000 | 66 pcs | 0.015 |
| 25 x 150 x 6000 | 44 pcs | 0.0225 |
| 25 x 200 x 6000 | 33 pcs | 0.03 |
| 30 x 100 x 6000 | 55 pcs | 0.018 |
| 30 x 150 x 6000 | 37 pcs | 0.027 |
| 30 x 200 x 6000 | 27 pcs | 0.036 |
| 40 x 100 x 6000 | 41 pcs | 0.024 |
| 40 x 150 x 6000 | 27 pcs | 0.036 |
| 40 x 200 x 6000 | 20 pcs | 0.048 |
| 50 x 100 x 6000 | 33 pcs | 0.03 |
| 50 x 150 x 6000 | 22 pcs | 0.045 |
| 50 x 200 x 6000 | 16 pcs | 0.06 |
| Bruschi | ||
| Beam size | Quantity of timber in 1 cube | Volume of wood in 1 beam, cubic meters |
| 25 x 50 x 3000 | 266 pcs | 0.00375 |
| 30 x 40 x 3000 | 277 pcs | 0.0036 |
| 30 x 50 x 3000 | 222 pcs | 0.0045 |
| 40 x 40 x 3000 | 208 pcs | 0.0048 |
| 50 x 50 x 3000 | 133 pcs | 0.0075 |
| 50 x 50 x 6000 | 66 pcs | 0.015 |
| 50 x 70 x 3000 | 95 pcs | 0.0105 |
| 100 x 100 x 6000 | 16 pcs | 0.06 |
| 100 x 150 x 6000 | 11 pcs | 0.09 |
| 100 x 200 x 6000 | 8 pcs | 0.12 |
| 150 x 150 x 6000 | 7 pcs | 0.135 |
| 150 x 200 x 6000 | 5 pieces | 0.18 |
| 200 x 200 x 6000 | 4 things | 0.24 |
All photos from the article
Anyone planning construction or renovation should figure out how many boards are in a square meter, how many cubic meters of material are needed to implement a particular project, how many squares can be covered with one cubic meter of material, etc. And although today it is not difficult to find tabular values for almost any situation, it is still advisable to understand how the calculations are carried out and, if necessary, be able to carry out the calculations yourself.
Dimensions of boards
How much is a cubic meter of board? One of the most common questions asked by newbie masters. In fact, this question can be given an extremely simple answer: it depends on what kind of lumber we are talking about!
As a rule, for construction and repair work Use blanks produced in accordance with GOST 8486-86. This standard regulates the basic requirements for lumber coniferous species(for deciduous trees there is a separate document - GOST 2695-83), determines what size the product can have.
In principle, choosing the right part is not difficult, but there are still certain restrictions that limit the production of blanks:
- thickness – from 16 to 75 mm;
- width – from 75 to 275 mm;
- length - from 1 to 6 m.
Naturally, there are also deviations. So, if necessary, you can order the production of parts with a different ratio of thickness and width. Their price, of course, will be higher than standard ones, but if necessary and the availability of suitable raw materials, you can cut almost any workpiece.
Starting construction or renovation wooden house, you have to purchase various boards, while the buyer knows the total length, but the seller sells lumber by volume. This article will help you correctly determine the number of any boards in one cubic meter, which will help you avoid purchasing too much lumber.
How to calculate the volume of edged boards
The volume of one board is determined in the same way that was used at school - by multiplying the length by the width and thickness. Or multiplying the width by the length and thickness. It doesn't matter in what order you multiply the board sizes, the result will always be the same. For example, a standard “fifty” board has the following dimensions:
- length 6 meters;
- width 20 centimeters;
- thickness 5 centimeters.
To facilitate multiplication, it is necessary to convert all dimensions to common units - meters or centimeters. It’s easier to carry out these calculations in meters, then you don’t have to divide the resulting number by a million to convert it to cubic meters.
- As a result of multiplication, we obtain the volume of one board 0.06 cubic meters.
- After this, divide the unit by 0.06 and get the number of boards in one cubic meter.
- We get the number 16.6666, which must be rounded to the nearest whole, that is, to 16, which will be the number of “fifty” boards in one cubic meter. It is always necessary to round down, because some of the boards may be slightly wider or thicker, they may not be laid tightly, or several boards from the package may be twisted. If all the boards turn out to be normal, then fractions can also be taken into account; this is especially true for thick timber.
Table of standard volume values
For your convenience, we have created a table with the most common sizes of boards and timber, as well as their quantity in one cubic meter
|
Size in millimeters |
Volume of one board cubic m. |
Number of boards in one cubic meter |
We will send the material to you by e-mail
When starting construction, any House master one day he is faced with the need to purchase boards. And this is where the fun begins. Having calculated the required quadrature by width and length, the beginner grabs his head - what to do? After all, such material in construction markets is sold by volume, not by area. Today we will try to figure out how many boards are in a cube (a table of average values will also be provided by us) and how to make all the calculations ourselves. Also at the end of the article there will be an online calculator that will allow you to perform all the necessary calculations without any problems.
It is important to know not only the size of the lumber, but also its volume
Everyone understands that the shape and size of the lumber will determine how many cubic meters will be needed for a particular construction. But first you need to understand what types and types of material can be found. The main ones can be identified:
- Edged timber;
- Planed timber;
- Planed block;
- Edged block;
- Edged and floor boards;
- Unedged materials.
Each of these types has its own characteristics and is used in its own area. For example, there is no way to build a frame without it, but covering a wall with it is the height of irrationality. To do this, we will now consider each of these types separately.
Edged timber and its areas of application
Edged timber is used in cases where appearance Aesthetics are not that important. It may have cracks that appear during the drying process after processing. It is made by sawing out the central part from an ordinary log, and only after that it undergoes minimal drying. Although such lumber is considered expensive, it is still cheaper than planed products.
Planed timber: what is its difference from edged timber
The differences here are fundamental. If for the production of the previous version no preparation of the log is required, then for planed it is first dried, and only after that it goes to the sawmill. The surface of this product is smooth and polished. This type of timber can even become a good decorative element. Simply put, if it is necessary to erect walls for finishing, edged timber is purchased, but planed timber does not require finishing. It can simply be varnished. If we talk about strength, it is less for a planed product.
Planed timber - what is its difference from timber
At their core, these are the same thing, the only difference is in size. The timber has a lower rib height, which means it is not suitable for constructing the frames of buildings or residential buildings. More often this material is used for decorative purposes. It also finds application in the installation of frames for interior decoration or reinforcing lintels of various wooden panels. The difference between edged and planed timber and the same types of timber is the same.
Edged and floorboards: their features and differences
The differences between these lumber are also noticeable at first glance. The edged board is not planed. It has an even shape but, at the same time, is in no way suitable for finishing. In contrast, the floor has three smoothly processed edges (except for the lower wide one) and often has a groove on one side and a tenon on the other on the narrow sides. This is done to connect them more tightly to each other, as well as to reduce loads and eliminate deformation of the floor during operation.
Unedged materials - what are they?
These are the cheapest products. When sawing a log, only two opposite sides. Thus, the edges of the boards are uneven. More often, such lumber is used for rough construction.
How many boards per cubic meter: table of standard sizes
Some people ask an interesting question - how much? square meters cubed. In fact, it is impossible to answer it! After all, in order to determine this, you need to at least know the thickness of the board. Without this parameter, no calculations will be possible. Let's try to understand how to calculate cubic capacity.
This does not present any great difficulties, but it requires care. We need to understand how many boards are in a cube. And to do this you need to calculate the cubic capacity of one of them by size. For example, a board with a cross-section of 1000x250 mm and a length of 4 m. Then the calculations, after converting the units of measurement into meters, will be as follows: 0.1 × 0.025 × 4 = 0.01 m 3. This will be the answer to the question of how to calculate the cubic capacity of the board.
How many boards are in a cube: table of average values
For example, there are boards with certain sizes. How to calculate a cube of such lumber by the number of boards? You can use the following table:
| Board size, mm | Volume of 1 board, m3 | Number of boards in 1 m3, pcs. | Volume of overpayment when rounded down, % |
|---|---|---|---|
| 25x150x4000 | 0,015 | 66,7 | 1 |
| 40x150x4000 | 0,024 | 41,6 | 0,7 |
| 20x100x6000 | 0,012 | 83,3 | 2,8 |
| 25x100x6000 | 0,15 | 66,7 | 1 |
| 40x100x6000 | 0,024 | 41,6 | 0,7 |
| 50x100x6000 | 0,03 | 33,3 | 1 |
| 25x150x6000 | 0,025 | 44,4 | 1 |
| 30x150x6000 | 0,027 | 37,04 | 0,01 |
| 40x150x6000 | 0,036 | 27,8 | 2,9 |
| 50x150x6000 | 0,045 | 22,2 | 0,9 |
| 25x200x6000 | 0,03 | 33,3 | 1 |
| 40x200x6000 | 0,048 | 20,8 | 3,8 |
| 50x200x6000 | 0,06 | 16,7 | 4,2 |
It is important to know! To calculate how many square meters are in a cubic meter, you need to know all the dimensions of the board. Without information about length, width and thickness, nothing will work.
Average weights at different humidity levels
| Breed name | Crude, kg/m3 | Dry, kg/m3 |
|---|---|---|
| Birch | 880 | 650 |
| Oak | 990 | 720 |
| Spruce | 710 | 450 |
| Cedar | 700 | 440 |
| Larch | 840 | 670 |
| Linden | 750 | 500 |
| Aspen | 750 | 500 |
| Pine | 810 | 510 |
| Ash | 960 | 700 |
It turns out that one cube of ash will be much heavier than the same volume of linden. This should be kept in mind when planning your transportation.
How to correctly calculate the amount of material
Let's look at how to correctly calculate how many pieces of boards there will be in one cubic meter. This is done according to the following formula:
1 m 3 / (L × h × b) = N pieces , Where
- L – length of the board;
- h - width;
- b – thickness.
As you can see, the calculations are not at all complicated.
Helpful information! If they say that an inch board is needed, its size will be as follows: width – 75-250 mm, length – 2000-6000 mm, but the thickness is always standard – 25 mm. This size name can often be heard in construction markets.
Board cubic capacity calculator or how to make calculations easier
The algorithm itself for how to calculate a cubic meter by quantity is probably now clear. But there is not always a desire to engage in various calculations. And it’s quite easy to make a mistake here. Now we will tell you how to calculate cubeboards without making complex calculations.
For such cases there are special programs, called cubic meter calculators. Why are they convenient? The main advantage of such programs is their accuracy. The calculator for calculating a board in a cube is devoid of the human factor, which eliminates the possibility of errors in the calculation process. Another rather weighty argument in its favor is the speed of calculations. You just need to enter the correct data in the appropriate fields and click on the “calculate” button. Nothing more is required from the user. The online calculator of boards in a cube will instantly give the result by quantity.