Home arrow Conversions
Timber Conversions PDF  | Print |


TIMBER PRODUCTS: METRIC - IMPERIAL CONVERSIONS

Timber products are imported or manufactured in metric dimensions and unless specifically requested otherwise, they will usually be available in a size close to an 'old' imperial equivalent. The most common dimensions are summarised below.

Timber Lengths
Standard Timber Lengths are :-

Metric length
(metres)		 Imperial length
(to nearest 1/16 in)		 Approx Equiv
Size in Feet
0.9 2 ft 11 7/16 ins 3 ft
1.2 3 ft 11 1/4 ins 4 ft
1.5 4 ft 11 1/16 ins 5 ft
1.8 5 ft 10 7/8 ins 6 ft
2.1 6 ft 10 11/16 ins 7 ft
2.4 7 ft 10 1/ 2 ins 8 ft
2.7 8 ft 10 5/16 ins 9 ft
3.0 9 ft 10 1/8 ins 10 ft
3.3 10 ft 9 15/16 ins 11 ft
3.6 11 ft 9 3/4 ins 12 ft
3.9 12 ft 9 9/16 ins 13 ft
4.2 13 ft 9 1/4 ins 14 ft
4.5 14 ft 9 1/8 ins 15 ft
4.8 15 ft 8 15/16 ins 16 ft
5.1 16 ft 8 3/4 ins 17 ft
5.4 17 ft 8 9/16 ins 18 ft
5.7 18 ft 8 3/8 ins 19 ft
6.0 19 ft 8 3/16 ins 20 ft
6.3 20 ft 8 ins 21 ft
6.6 21 ft 7 13/16 ins 22 ft
6.9 22 ft 7 5/8 ins 23 ft
7.2 23 ft 7 7/16 ins 24 ft

N.B.  Longer lengths may be available to special order.

TIMBER SIZES

All timber sections are quoted in 'nominal' sizes - the actual size of sawn timber or the size of a machined timber section before any planing or moulding. The actual 'finished' sizes of machined timber will be 4-6mm less than those listed.

For example:

50x100 mm planed timber (PAR) will be approximately 45x95mm actual size
19x75 mm planed timber (PAR) will be approximately 15x70mm actual size


Common Timber Sections are:-

Metric Size
(mm)		 Imperial size
(Inches) 		Approx Equiv
Size in Inches
12 0.472 1/2 in
13 0.512 1/2 in
16 0.630 5/8 in
18 0.709 3/4 in
19 0.748 3/4 in
22 0.866 7/8 in
25 0.984 1 in
32 1.260 1 1/4 in
38 1.496 1 1/2 in
44 1.732 1 3/4 in
47 1.850 1 7/8 in
50 1.969 2 in
57 2.244 2 1/4 in
63 2.480 2 1/2 in
75 2.953 3 in
85 3.346 3 5/16 in
88 3.465 3 1/2 in
100 3.937 4 in
115 4.528 4 1/2 in
125 4.921 5 in
138 5.433 5 1/2 in
150 5.906 6 in
175 6.890 7 in
200 7.874 8 in
225 8.858 9 in
250 9.843 10 in
275 10.827 11 in
300 11.811 12 in



COMMON CONVERSIONS

The table below gives guidance on some common conversions you may need:-

Metric to Imperial  Imperial to Metric 


To convert millimetres (mm) to inches (in), multiply by 0.039.

Example: 380 mm x 0.039 => 15 in 


To convert inches (in) to centimetres (cm) to, multiply by 2.54.

Example: 17 in x 2.54 => 43 cm


To convert square metres (m2) to square feet (ft2), multiply by 10.764.

Example: 40 m2 x 10.764 => 430 ft2



To convert square feet (ft2) to square metres (m2), multiply by 0.093.

Example: 180 ft2 x 0.093 => 16.7 m2


To convert cubic metres (m3) to cubic yards (yd3), multiply by 1.308.

Example: 20 m3 x 1.308 => 26 yd3



To convert cubic yards (yd3) to cubic metres (m3), multiply by 0.765.

Example: 20 yd3 x 0.765 => 15 m3


To convert cubic metres (m3) to cubic feet (ft3), multiply by 35.315.

Example: 2 m3 x 35.315 => 71 m3




To convert cubic feet (ft3) to cubic metres (m3), multiply by 0.028.

Example: 200 ft3 x 0.028 => 5.6 m3