It's about 1.4m3 per tonne, depending on what kind of wood you're talking about.
Reference http://www.forestry.gov.uk/website/forstats2008.nsf/0/8B4784E90B2A535480257361005015C6
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By multiplying it by the density of the substance (expressed in tonne/m3) that occupies the volume of 1000m3.
one m3 is equal to 1000 KL, so to convert KL to m3 we divide the number by a thousand.
12
cubic centimetres / 1,000,000 = cubic metres
Divide cm^3 by 1,000,000 = one million.