ABSTRACT
Given the dual use of SI and British Imperial Units in the UK construction industry, quick and easy conversion between the two systems is essential. A selection of useful conversion factors are:
Mass 1 kg 2.205 lb 1 lb 0.4536 kg 1 tonne 0.9842 tons 1 ton 1.016 tonnes
Length 1 mm 0.03937 in 1 in 25.4 mm 1 m 3.281 ft 1 ft 0.3048 m 1 m 1.094 yd 1 yd 0.9144 m
Force 1 N 0.2248 lbf 1 lbf 4.448 N 1 kN 0.1004 tonf 1 tonf 9.964 kN
Stress and pressure
Line loading 1 kN/m 68.53 lbf/ft 1 lbf/ft 0.0146 kN/m 1 kN/m 0.03059 tonf/ft 1 tonf/ft 32.69 kN/m
Moment 1 Nm 0.7376 lbf ft 1 lbf ft 1.356 Nm
Modulus of elasticity
Section modulus
Second moment of area
Temperature
x °C [(1.8 x 32)]°F y °F [( y – 32)/1.8]°C
NOTES: 1. 1 tonne 1000 kg 10 kN. 2. 1 ha 10 000 m 2 .
