Lumber Calculator

Written byOleh Soloninupdated 25 September 2026

Thickness, mm

Width, mm

Length, m

How many pieces

Price per m³

Advanced options

Timber density, kg/m³

Pine and spruce at 12% moisture stay under 550 kg/m³; fresh-sawn boards weigh noticeably more.

Result

Volume of one board, m³0.045
Total volume, m³0.45
Pieces per m³22
Around one cubic metre22 pcs = 0.99 m³, 23 pcs = 1.035 m³
Total area, m²9
Costno price given
Weight, kg234
How it was calculated
one board: 0.05 × 0.15 × 6 = 0.045 m³ 10 pcs × 0.045 = 0.45 m³, weighing 234 kg at 520 kg/m³ per cubic metre: 1 ÷ 0.045 = 22 pcs

Sold by volume, bought by the piece

Timber volume in cubic metres, how many boards fit in a cube, total area covered, mass and cost.

The volume of a board is three dimensions multiplied: a 50 × 150 mm board 6 m long is 0.045 m³, and ten of them are 0.45 m³. Twenty-two fit in a cubic metre, and that is the figure timber is priced by.

"Pieces per cubic metre" is a rounded number: 22 boards make 0.99 m³ and 23 make 1.035 m³. The calculator prints both, because some yards sell the short cube and others add a board on top.

How to use

Enter the cross-section in millimetres and the length in metres.
Set how many pieces you need; add a price per cubic metre and the timber density if you want them.
Read the volume of one board, the total, the pieces per cubic metre, the area and the weight.

Common sections in a cubic metre

Every row is a separate run of this calculator at a density of 520 kg/m³.

Every value was produced by the calculator on this page.
Section	Length	Pieces	One board	Volume	Per m³	Area	Weight
50 × 150 mm	6 m	10	0.045 m³	0.45 m³	22	9 m²	234 kg
25 × 100 mm	4 m	50	0.01 m³	0.5 m³	100	20 m²	260 kg
100 × 100 mm	6 m	10	0.06 m³	0.6 m³	16	6 m²	312 kg
40 × 150 mm	6 m	20	0.036 m³	0.72 m³	27	18 m²	374.4 kg
50 × 200 mm	6 m	15	0.06 m³	0.9 m³	16	18 m²	468 kg

Sizes in GOST 24454-80

The Russian standard for sawn softwood lists thicknesses of 16, 19, 22, 25, 32, 40, 44, 50, 60, 75, 100, 125, 150, 175, 200 and 250 mm and widths from 75 to 275 mm, with lengths from 1.0 to 6.5 m in 0.25 m steps.

Those sizes are stated at 20% moisture; at any other moisture the actual thickness and width differ by the shrinkage. A kiln-dried board therefore measures less than its nominal size, while the nominal size is what you pay for. Imperial yards work the same way — a "2 by 4" is not 2 by 4 inches either.

Weight follows moisture

The default is 520 kg/m³. The Russian Wikipedia article on timber puts pine and spruce among the low-density species, under 550 kg/m³ at 12% moisture, which is a fair guide for dry boards.

Fresh-sawn timber is far wetter: the same article gives the sapwood of pine 100–150% moisture relative to oven-dry mass. Such boards weigh considerably more, so if you are checking a load on a floor or a van, put your own density in.

What this calculator shows

Volume of one board and of the whole order
How many pieces fit in a cubic metre
Total covered area, mass and cost at your price per cube

What to keep in mind

Dimensions are nominal, as quoted. Planed timber can be smaller than nominal, so use the supplier's finished sizes.
Mass uses the density entered, 520 kg/m³ for pine by default; freshly sawn timber can be much heavier, so use data for the species and its real moisture.

FAQs

How many 50 × 150 × 6000 boards in a cubic metre?

Twenty-two: one board is 0.045 m³, twenty-two make 0.99 m³ and twenty-three make 1.035 m³. Yards round it differently, so both are shown.

How do I calculate board volume?

Multiply thickness, width and length in metres: 0.05 × 0.15 × 6 = 0.045 m³, then multiply by the number of pieces.

How many 25 × 100 × 4000 boards in a cubic metre?

Exactly a hundred: one board is 0.01 m³. It is one of the few sizes that divides a cubic metre evenly.

How much does a cubic metre of timber weigh?

About 520 kg for dry pine or spruce, so 0.45 m³ is 234 kg. Fresh timber weighs more, and for a load calculation you should enter your own density.

Which sizes count as standard?

GOST 24454-80 gives thicknesses from 16 to 250 mm, widths from 75 to 275 mm and lengths from 1.0 to 6.5 m in 0.25 m steps. The calculator accepts any section, standard or not.

Nominal size or actual size?

Nominal: that is what is invoiced, and the standard sizes refer to 20% moisture. A dried board measures less but is still sold as 50 × 150.

Worked example

Ten 50 × 150 × 6000 boards

Input: 50 × 150 mm, 6 m, 10 pieces, density 520 kg/m³

Output: 0.45 m³, 22 pieces per cubic metre, 234 kg

Note: 22 boards are 0.99 m³ and 23 boards are 1.035 m³.

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