Quantity Definitions & Conversions around The Timber Trade


The Formulas of the Experts: 
Unit or Measure 
Formula or Conversian Factor/s 
Usual use 
Countries using 
Foot Board Measure
(BF, MBF, FBM) 
= 12 in. * 12 in. * 1 in. = 1/12th cubic foot
1,980 FBM = 1 standard (of 165 cubic foot).
1,000 FBM = 83.3 cubic feet = 2.36 cubic metres
= 0.505 standards 
Log and Lumber
(sawn timber)
measure 
North America 
Doyle Measure
(DM, DF, MDF) 
Method:
A deduction of 4 inches from diameter is made for slabs.
Volume:
Length(ft) * (diameter(ins)  4 ins.)² / 16 = board feet 
Board feet measure that can be produced from good log 
North America 
Cubic metre
(cbm, m3) 
= 35.315 cubic feet
= 423.728 board feet (12 ins.*12 ins.*1 in.) of sawn wood
= 0.214 standards (of 165 cubic feet) of sawn wood
= 35.315 cubic feet of roundwood (Hoppus 113 measure)
= 27.72 Hoppus cubic feet of roundwood (Hoppus 144 measure) 
Continental log and timber measure and timber statistics issued by european countries 
Europe and other countries 
Circumference (girth) Measurement
(cbm, m3) 
Method:
"True content of cylinder".
The length and midcircumference of the log are measured
Formular:
Radius² * Pi (3.1416) * length
Volume:
Circumference / 3.1416 / 2 = (Radius)² * 3.14 * length = m3 (cbm)
Example:
1st. step: 203cm(circumf.) / 3.1416(Pi) =64.6cm(diameter)
2nd.step: 0.647 m / 2 = 0.324 m (radius)
3rd. step: 0.324 m (Radius) * 0.324 m (Radius)
* 3.1416 (PI) * 3.30 m (length)
= 1.088 m3 (cubic metre) volume 
Continental log measure 
Europe, Germany and other countries 
Diameter measurement
(cbm, m3) 
Method:
"True content of cylinder".
The length and middiameter of the log are measured
Formular:
Radius² * Pi (3.1416) * length
Volume:
diameter / 2 = (Radius)² * 3.1416 * length = m3 (cbm)
Example:
1st. step: 0.647 m (diameter) / 2 = 0.324 m (radius)
2nd. step: 0.324 m (Radius) * 0.324 m (Radius)
* 3.1416 (PI) * 3.30 m (length)
= 1.088 m3 (cubic metre) volume 
Continental log measure 
Europe, Germany and other countries 
Festmeter
(fm) 
similar to" true content of cylinder" method of circumference measurement and/or diameter measurement
= 1 cubic metre of roundwood felled,
or 1 cubic metre of standing timber. 
Continental log measure 
Germany 
cubic metre
(cbm, m3) 
Method:
The thickness, length and midwidth of the board are mesasured, midwidth includes half of the edges of unedged boards.
Volume:
thickness * length * width = m3 (cbm)
Example:
0.052 m (thick) * 3.10 m (length) * 0.26 m (width)
= 0.042 m3 (cbm) 
Unedged lumber measure 

cubic metre
(cbm, m3) 
Method:
The thickness, length and width of the paralleledged board are mesasured.
Volume:
thickness * length * width = m3 (cbm)
Example:
0.052 cm (thick) * 3.10 m (length) * 0.26 m (width)
= 0.042 m3 (cbm) 
Edged lumber measure 

inch (english) 
= 25.4 mm = 2.54 cm = 0.0254 metre 


foot (english) 
= 304.8 mm = 30.48 cm = 0.3048 metre 


metre (m) 
= 1000 mm = 100 cm = 1 metre 


Board Feet 
1,000 Board Feet ( 1 MBF) = 2.36 m3 (cbm) 
