Enter the thickness, width, length and quantity for each size of timber and get the total board feet, the volume in cubic metres, and the cost at your price. Add a row for every size on your cutting list, in millimetres and metres or in inches and feet.
4.1 ea41.2 bd ft
A board foot is a fixed volume of about 0.00236 m³ - one cubic metre is roughly 424 board feet. Add a row for each size, enter how many of each, and the total board feet, the volume and - if you set a price - the cost all add up below. Timber is figured at its nominal size, so enter a 45 × 90 as 45 by 90. Leave the price at 0 to skip the cost.
Volume (m³)
0.097 m³
Pieces
10
41.2 bd ft ≈ 0.097 m³.
A board foot is a measure of timber volume: the amount of wood in a piece 1 inch thick, 12 inches wide and 1 foot long, which is 144 cubic inches. Because it is a volume, it captures thickness, width and length all at once - the way sawmills and timber yards price rough and hardwood stock. The classic shop formula works in inches and feet:
board feet (one piece) = thickness_in × width_in × length_ft ÷ 12
row total = board feet per piece × quantity
total = sum of every row
to order = total × (1 + waste %)
cost = board feet to order × price per board foot
1 board foot = 144 cubic inches = 0.00236 m³ 1 m³ ≈ 423.8 board feet
1 cubic foot = 12 board feet
Enter the nominal size you buy - a 2×4 is figured as 2 by 4, even though its actual size is 1½ × 3½ in - and add a row for each different size on your cutting list. The calculator totals the board feet, shows the volume in cubic feet or cubic metres, and, if you give it a price per board foot, the cost. For the formula behind it, see how to calculate board feet.
This example follows the unit system you pick in the calculator above.
Ten 45 × 90 mm studs at 2.4 m, plus four 19 × 140 mm shelves at 3 m, at $6 per board foot:
The board feet in one piece depends only on its thickness, width and length. This table lists the figure for common sizes, so you can multiply by your quantity in your head or check the calculator:
| Nominal size | Length | Board feet (each) |
|---|---|---|
| 1 × 4 | 8 ft | 2.67 |
| 1 × 6 | 8 ft | 4.00 |
| 1 × 8 | 8 ft | 5.33 |
| 2 × 4 | 8 ft | 5.33 |
| 2 × 4 | 10 ft | 6.67 |
| 2 × 6 | 8 ft | 8.00 |
| 2 × 8 | 8 ft | 10.67 |
| 2 × 10 | 10 ft | 16.67 |
| 4 × 4 | 8 ft | 10.67 |
Hardwood is often sold in quarter thicknesses: 4/4 is one inch, 8/4 is two inches. Enter the thickness in inches (4/4 = 1, 5/4 = 1.25, 8/4 = 2) and the calculator handles the rest - see what 4/4, 5/4 and 8/4 mean for the full system.
In Australia, timber is sold by the lineal metre, usually in 300 mm length multiples, with framing to AS 1684. Whichever way it is priced, the board feet and the cubic-metre volume the calculator gives are the same physical amount of wood - 1 m³ is about 423.8 board feet - so you can take the figure to a yard that quotes either way.
One thing to watch is size: dressed (DAR) timber finishes a few millimetres under the nominal sawn size, so quantities are figured on the nominal size you order. Enter the size you order at the yard in the calculator above so the volume matches what you actually buy. For the detail, see a guide to standard Australian timber sizes.
These three measure different things, and mixing them up is the usual source of an under-order:
For the plain-English version, see what is a board foot.
A board foot is a unit of timber volume - about 0.00236 m³, or 423.8 board feet to the cubic metre. Working in metres, multiply thickness × width × length to get the volume in cubic metres, then multiply by 423.8. A 45 × 90 mm stud at 2.4 m is 0.045 × 0.090 × 2.4 = 0.00972 m³, about 4.1 board feet, so ten of them are roughly 41 board feet. The calculator adds up every size on your cutting list and shows the cubic-metre volume alongside.
A board foot is a unit of timber volume, not length or area. It equals about 0.00236 m³ - the volume of a board roughly 25 mm thick and 300 mm square, or any piece with the same volume. It is the unit North American mills and hardwood suppliers price by, and you will still meet it on imported and figured hardwood. One cubic metre is about 423.8 board feet.
Use the nominal size - the size the timber is sold as. A 45 × 90 is figured at 45 × 90 even though dressed (DAR) timber finishes a few millimetres under, and board-foot pricing follows the nominal size. The calculator just multiplies the dimensions you enter, so type the size you order at the yard. For rough-sawn or imported hardwood, enter the sawn size before it is dressed.
Divide board feet by 423.776, or multiply by 0.00236. So 100 board feet is about 0.236 m³, and 1 m³ is about 423.8 board feet. The calculator shows both at once: enter your sizes and read the cubic-metre volume for a yard that sells timber by the m³, or the board feet for a supplier that quotes that way.
It depends entirely on the species and grade - construction softwood is at the low end, while figured hardwoods cost many times more. Rather than guess a figure, put your own price per board foot into the calculator and it multiplies it by the board feet to order (waste included) for a total. Leave the price at zero if you only want the quantity.
Add a row for each different size. Enter the thickness, width, length and how many of that size, and the calculator works out the board feet for the row and adds every row into a total. A waste allowance bumps the figure so you order a little extra for offcuts and defects, and the volume and cost update with it.
No. A lineal (or running) metre is just length - one metre of a board, whatever its cross-section. A board foot is a volume that takes thickness and width into account too. A metre of 45 × 90 timber works out to fewer board feet than a metre of 45 × 140, even though both are one lineal metre. Use lineal metres when timber is sold by length and board feet when it is sold by volume.
The actual size of a 2x4, 2x6, 2x8 and more - full chart in inches and mm.
Read guide→The board-foot formula, a worked example and the board feet in common boards.
Read guide→A board foot is 144 cubic inches of wood - and how it differs from other feet.
Read guide→The hardwood quarter system: 4/4 = 1 in, 5/4 = 1¼, 8/4 = 2, rough vs surfaced.
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