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Forestry Statistics 2016 - Sources

Sources: Timber

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Conversion factors between cubic metres and green tonnes

The following factors have been used in Chapter 2 (Timber) to convert between cubic metres (m3) and green tonnes:

Conversion factors between cubic metres and green tonnes

The diagram shows separate conversion factors to use when converting softwood (SW) and hardwood (HW) with arrows to indicate the direction of conversion.  For example, to convert 1,000 green tonnes of SW into an under bark volume, the 1,000 green tonnes should be multiplied by the conversion factor of 0.982 to give 982m3 underbark.  There is no difference between the  softwood and hardwood conversion factors for converting between standing volume and overbark volumes.

The following factors have been used in Chapter 3 (Trade) to convert between cubic metres (m3) and metric tonnes:

In this case, all the factors are expressed as volumes (in m3) per weight (in tonnes). Therefore, to convert 1,000 tonnes of sawn softwood into a volume, the 1,000 tonnes should be multiplied by 1.82 to give 1,820 m3.

Conversion factors between cubic metres and metric tonnes

Product

m3 / tonne

Fuelwood, including wood for charcoal

1.38

Wood chips, sawdust, etc

1.48

Industrial roundwood (wood in the rough) - softwood

1.43

Industrial roundwood (wood in the rough) - hardwood

1.25

Sawnwood - softwood

1.82

Sawnwood - hardwood

1.43

Veneer sheets

1.33

Plywood, particleboard

1.54

Hardboard

1.053

MDF (medium density fibreboard)

1.667

Insulating board - density 0.35-0.5 g/cm3

1.667

Insulating board - other

4.00

 

The following factors have been used in Chapter 3 (Trade) where required to convert to wood raw material equivalent, which indicates the volume of wood (in m3 underbark) needed to produce one unit of a final product:

Conversion factors to Wood Raw Material Equivalent (wrme) underbark

Product

Measurement unit

Factor to wrme underbark

Fuelwood

tonnes

1.20

Wood charcoal

tonnes

6.00

Chips, sawdust, etc

tonnes

1.20

Industrial roundwood (rough, treated)

m3

1.10

Industrial roundwood (in the rough)

m3

1.00

Sleepers

m3

1.58

Softwood sawnwood

m3

2.00

Hardwood sawnwood

tonnes

2.50

Wastepaper

tonnes

2.80

Mechanical pulp

tonnes

2.50

Chemical dissolving pulp

tonnes

2.50

Sulphate pulp, unbleached

tonnes

6.00

Sulphate pulp, bleached

tonnes

4.50

Sulphite pulp

tonnes

5.00

Semi-chemical woodpulp

tonnes

2.75

Veneer (< 6mm)

tonnes

3.45

Other wood-based panels

tonnes

2.50

Woodwool, woodflour

tonnes

1.70

Packing cases, pallets

tonnes

2.00

Other manufactured wood

tonnes

2.50

Newsprint

tonnes

2.80

Writing & printing paper, uncoated

tonnes

3.50

Other paper & paperboard

tonnes

2.50

Notes:

1. A revised set of figures was produced in FC Technical Paper 19, "Revised Forecasts of the Supply and Demand for Wood in the UK" (Forestry Commission, 1996), but these have not been used in this publication.

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