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Imperial versus metric measurements

Here is a table that can help you convert units of measurement:

ImperialMetric
The inch.
Symbol: “
  • 1/8″ = 0,125″ = 0,3175 m
  • 1/4″ = 0,250″ = 6,35 mm
  • 3/8″ = 0,375″ = 9,525 mm
  • 1/2″ = 0,5″ = 12,7 mm
  • 3/4″ = 0,75″ = 19,05 mm
  • 1″ = 25,4 mm
The feet.
Symbol: ‘
  • 1′ = 12″ = 30,48 cm
  • 2′ = 24″ = 60,96 cm
  • 3′ = 36″ = 1 097,28 cm
  • 4′ = 48″ = 1 463,04 cm
  • 8′ = 96″ = 2 926,08 cm

Wood thickness guide

ThicknessRawFinished
4/41″3/4″
5/41 1/4″1″
6/41 1/2″1 1/4″
8/42″1 3/4″
10/42 1/2″2 1/4″
12/43″2 3/4″
16/44″3 3/4″

BMF = Board Measure Foot

In North America, it is one of the commonly used measurement units for wood volume. A BMF is a board 1″ thick by 1 foot wide by 1 foot long.

1 BMF= 1″ x 12″ x 12″ = 144 cubic inches

Formula #1 : inches + feet

To obtain the desired number of PMPs, multiply the thickness, width and length of your board in inches then divide by 12 feet. Which gives the following formula:


    \[BMF=\frac{thickness\,(inch)*width\,(inch)*length\,(feet)}{12\,feet}\]

Formula #2 : all in inches

To get the desired number of PMPs, multiply the thickness, width and length of your board in inches then divide by 144 inches. Which gives the following formula:


    \[BMF=\frac{thickness\,(inch)*width\,(inch)*length\,(inch)}{144\,inches}\]

Examples :

1) Start by determining the dimensions of your boards:

  1. Our first example will be with a 1″ x 6″ x 6′ board.
    Here, the thickness is 1″ so you will need boards of 4/4.
  2. Our second example will be with a board of 3″ x 8″ x 10′.
    Here, the thickness is 3″ so you will need boards of 12/4.

Refer to the wood thickness guide above.

2) Thanks to the dimensions, calculate the volume of BMF:

  1. Volume # 1 = (1″ x 6″ x 6′) / 12′ = 3 BMF or Volume # 1 = (1″ x 6″ x 72″) / 144 = 3 BMF.
  2. Volume # 2 = (3″ x 8″ x 10′) / 12′ = 20 BMF or Volume # 2 = 31″ x 8″ x 120″) / 144 = 20 BMF.

3) Add the 15% loss

  1. Volume # 1 = 3 BMF + 0.45 BMF (loss) = 3.45 BMF = about 4 BMF
  2. Volume # 2 = 20 BMF + 3 BMF (loss) = 23 BMF

Round to the nearest integer.

15% is given as an indication.

4) Multiply the volume of PMP by the price of your supplier’s wood.

In our examples, we will take maple whose fictitious price will be fixed at $ 2.00 of the BMF for 4/4 and $ 3.00 of the BMF for 12/4. It would cost us so:

  1. Price # 1 = 4 x 2.00 = $ 8.00 for our rough maple plank: 1″ x 6″ x 6′ that you would order in 4/4.
  2. Pricing # 2 = 23 x 3.00 = $ 69.00 for our rough maple plank: 3″ x 8″ x 10′ that you would order in 12/4.

Anatomy of a board (TODO)

Thickness, Width, Length, Tip, Face = Flat, Singing. Put an picture here…

Wood species

Here is a ranking of the species:

  • Soft woods like balsa, linden, poplar, etc.
  • Hard woods such as maple, birch, oak, beech, etc.
  • Softwoods such as pine, cedar, larch, fir, spruce, etc.
  • Exotic woods such as ebony, mahogany, jatoba, teak, etc.

Spruce in Quebec is épicéa in Europe and hemlock in Acadia.

Birch in North America is yellow birch in Europe.