Merton Timber - Suppliers of sawn and machined timber, plywood, MDF, doors, insulation, roofing, concrete products, paving, tools, ironmongery and flooring

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Common Conversions | Timber Products Metric-Imperial
Board and Door Sizes | Flooring Cladding and Decking | Building Materials

COMMON CONVERSIONS

The table below gives guidance on some common conversions you may need for timber & building materials.

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

To convert kilograms (kg) to pounds (lbs), multiply by 2.205

Example: 25 kg x 2.205 => 55 lbs

To convert pounds (lbs) to grams (gm), multiply by 454

Example: 2 lbs x 454 = 908 grams

An imperial ton is approximately the same as a metric tonne. A more accurate conversion is:

To convert tonnes (1000kg) to tons, multiply by 0.984

To convert tons to tonnes (equals 1000kg), multiply by 1.016

To convert litres (l or ltr)to gallons (gall), multiply by 0.22

Example: 25 litres x 0.22 => 5.5 galls

To convert gallons (gall) to litres (l), multiply by 4.544

Example: 50 galls x 4.544 => 227 litres

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

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 | Timber Products Metric-Imperial
Board and Door Sizes | Flooring Cladding and Decking | Building Materials

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