长度单位
1 in = 25.4 mm
1 ft = 0.3048 m
1 mile = 1609.3 m
1 micron = 10-6 m 质量单位
1 lb = 453.3 g
1 cwt = 50.8 kg
1 ten(imp) = 1016 kg
1 ton(us) = 907.2 kg
1 tonne = 1000 kg

力矩单位
1 inlb = 0.113 Nm
1 ft lb = 1.356 Nm
1 kgm = 9.807 Nm
1 ft poundal = 0.0421 Nm

功及能量单位
1 lbft = 1.356 J
1 Nm = 1 J
1 kgm = 9.807 J
1 kW/hr = 3.6 MJ

面积单位
1 in2 = 6.45 cm2
1 ft2 = 0.093 m2

压力单位
1 psi = 6.89 kPa
1 kgf/cm2 = 98.07 kPa
1 bar = 100kPa
1 bar = 14.5 psi
1 atmosphere = 98.1 kPa
1"(标准) = 101.33 kPa
1 厘米水压 = 97.89 pa
1 英寸水压 = 248.64 Pa
1 毫米汞柱 = 133.3 Pa
1 英寸汞柱 = 3.39 kPa
1 Torr = 133.3 Pa
1 英尺水压 = 0.0298 bar
1 bar = 33.33 英尺水压

温度单位
(°F-32)×5/9 = ℃
K - 273.48 = ℃
　

体积单位
1 litre = 0.001 m3
1cu.ft. = 0.0283 m3
1 cu.in. = 16.39 cm3
1 gal(imp) = 4.546 L
1 fluid oz.(imp) = 28.41 ml
1 fluid oz.(us) = 29.57 ml

力单位
1 lbf = 4.45 N
1 kgf = 9.81 N
1 kp(kilopond) = 9.81 N
1 poundal = 138.3 mN
1 ton force = 9.964 kN

功率单位
1 lbft/sec = 1.356 W
1 kgm/sec = 9.807 W
1 Nm/sec = 1 W
1 Joule/sec = 1 W
1 H.P.(imp) = 745.7 W