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  Conversion Tables

Length
1 inch = 25.40mm
1 foot = 304.8mm
1 yard = 914.4mm
1 yard = 3 feet
1 metre = 1.0936 yards
1 yard = 0.9144 metres
1 metre = 3.281 feet

Volume
1 cubic metre = 35.315 cubic feet
1 cubic metre = 1.3079 cubic yards
1 cubic foot = 0.0283 cubic metre
1 cubic yard = 0.7646 cubic metre

Weight
1 tonne (metric) = 2205 lbs
1 ton imperial = 2240 lbs
1000 grams = 1 kilogram
1000 kilograms = 1 tonne
1 kilogram = 2.20462 lbs.
1 kilogram = 0.0197 cwt
1 cwt = 112 lbs
1 cwt = 50.8 kg
1 lb = 0.4536 kg
1 lb = 16 oz
1 oz = 28.3 grams

Liquid Volume
1 litre = 0.035 cubic feet
1 cubic ft. = 28.32 litres
1 gallon = 4.5461 litres
1 cubic ft. = 6.23 gallons
1 cubic yd = 168.21 gallons
1 cubic mt = 1000 litres

Liquid Conversion
1000 millilitres(ml) = 1 litre
1 litre = 1.76 pints
1 ml = 1cc = 0.0017 pints
1ml or cc = 0.035 fluid ounce(oz)
1 litre = 0.22 gallons
1 fl.oz. = 28.413 ml or cc
1 pint = 568 ml or cc
1 pint = 0.568 litres

Area
1 square mm = 0.00155 sq. inches
1 square metre = 10.764 sq. feet
1 square metre = 1.196 sq. yards
1 square inch = 645.20 sq. mm
1 square foot = 0.0929 sq. metres
1 square yard = 0.8361 sq. metres

Weights of materials
Dry sand fine - 1.28 tonnes per cubic metre
Dry sand coarse - 1.6 tonnes per cubic metre
Topsoil (some moisture) - 1.44 tonnes per cubic metre
Ballast - 1.76 tonnes per cubic metre
Gravel - 1.92 tonnes per cubic metre
Shingle - 1.62 tonnes per cubic metre
Cement - 25 kg bags
Stiff clay - 1.6 tonnes per cubic metre
Loam - 1.28 tonnes per cubic metre
Peat (wet) - 0.96 tonnes per cubic metre
Peat (dry) - 0.8 tonnes per cubic metre
Lump chalk - 1.2 tonnes per cubic metre
Sandstone - 2.32 tonnes per cubic metre
Lias - 2.48 tonnes per cubic metre
Granite - 2.72 tonnes per cubic metre
Slate - 2.8 tonnes per cubic metre
Flint - 2.3 tonnes per cubic metre
Yorkstone - 2.5 tonnes per cubic metre
Brick rubble - 1.8--2.2 tonnes per cubic metre

Coverage of stone for 1 tonne weight
Sets (100mm x 100mm x 100mm) = 3.9 sq.m.
Cobbles 50/70mm on end = 6.5 sq.m.
Pebbles 25/45mm loose@50mm = 10 sq.m.
Gravel 25mm rolled = 30 sq.m.
Tarmac 12mm deep = 13 sq.m.
Yorkstone paving 50mm = 7.5 sq.m.
Slate 25mm deep = 12 sq.m.

Minimum depth of services
Water main - 900mm
Gas - 600mm
TV/Telephone - 350mm
Sewers under grass - 900mm
Sewers under hard surface - 1200mm
Electric over 22kv - 750mm
Electric under 22kv - 600mm

Foundation concrete
1 cubic metre = 6 x 50kg bags cement
1.76 tonnes ballast

General purpose concrete
1 cubic metre = 7 x 50kg bags cement
1.6 tonnes ballast

 
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