Lumber Calculator

Thickness, mm

Width, mm

Length, m

How many pieces

Price per m³

Result

Volume of one board, m³0.045
Total volume, m³0.45
Pieces per m³22
Total area, m²9
Costцена не указана
Mass (pine), kg234

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.

Timber is priced by cubic metre but built with by the piece, which makes the first question at any yard the same: how many boards in a cube. It depends only on section and length — a 50 by 150 mm board at 6 m is 0.045 m³, so 22 of them make a cube.

Mass is worth knowing too. A cubic metre of pine at normal moisture weighs about 520 kg, freshly sawn up to 700. That matters both for transport and for loading a floor.

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 is genuinely 3-5 mm smaller on each face.
Mass is for pine at about 20 percent moisture — freshly sawn is half again as heavy.

FAQs

How many 50 × 150 boards in a cubic metre?

At 6 m, 22; at 4 m, 33; at 3 m, 44. The volume of one board does not change with length — only how many fit in a cube.

How does planed timber differ from sawn?

Planing removes 3-5 mm per face. It is still sold at nominal size, so the real section is smaller — worth allowing for when fitting.

What does a cubic metre of timber weigh?

Pine at 20 percent moisture is about 520 kg, freshly sawn up to 700, kiln-dried around 450. Oak and larch are about half again heavier.

How do I calculate beam volume?

Exactly the same way: section times length. A 150 by 150 mm beam at 6 m is 0.135 m³, so a little over seven of them make a cube.

Worked example

Ten joists

Input: 50 × 150 mm, 6 m long, 10 pieces

Output: 0.45 m³, 22 pieces per cube, 234 kg

Note: Twenty-two boards to the cube is worth remembering: 50 by 150 at six metres is the most common joist and rafter section there is.

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