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SI – English unit conversion table ：
Pressure
English to SI SI to English 1 atm ＝ 101 .325 kPa 1 MPa ＝ 9.87 atm 1 ton/in^2 ＝ 15.4 MPa 1 lbf/in^2 ＝ 6.895 kPa 1 MPa ＝ 0.0647 ton/in^2 1 kPa ＝ 0.145 lbf/in^2
Length
English to SI SI to English 1 in ＝25.4 mm 1 cm ＝ 0.394 in 1 ft ＝30.5 cm 1 m ＝ 3.28 ft 1 yd ＝0.914 m 1 m ＝ 1.09 yd 1 mile ＝1.61 km 1 km ＝ 0.621 mile
Velocity
English to SI SI to English 1 miles/h ＝ 1.61 km/h 1 km/h ＝ 0.621 miles/h
Mass
English to SI SI to English 1 oz ＝ 28 .3 g 1 g ＝ 0.03527 oz 1 lb ＝ 454 g 1 kg ＝ 2.20 lb 1 ton ＝ 1.02 tonnet(t) 1 t ＝ 0.984 ton
Temperature
English to SI SI to English Fahrenheit(F) to Celsius(°C) F ＝ 9/5C + 32
°C = 5/9(F-32)
Area
English to SI SI to English 1 in^2 ＝ 6.45 cm^2 1 cm^2 ＝ 0.155 in^2 1 ft^2 ＝ 929 cm^2 1 m^2 ＝ 10.8 ft^2 1 ac ＝ 0.405 ha. 1 ha. ＝ 2.47 ac
Density
English to SI SI to English 1 lb/in^3 ＝27.7 g/cm^3 1 g/cm^3 = 0.031 lb/in^3 1 ton/yd^3 ＝ 1.33 t/m^3 1 t/m^3 = 0.752 ton/yd^3
Volume
English to SI SI to English 1 ft^3 ＝ 0.0283 m^3 1 m^3 ＝ 35.3 ft^3 1 bushel(bus) ＝0.03 52 m^3 1 m^3 ＝ 28. 41 bus
Power
English to SI SI to English 1 hp ＝0.746 kWh 1 kW ＝1.34 hp
Volume (fluids)
English to SI SI to English 1 pint(pt) ＝ 473 ml 1 l ＝ 2.114 pt 1 gal ＝ 4.55 l 1 L ＝ 220 gal
Frequency
English to SI SI to English 1 cycle per second(c/s) ＝ 1 Hz
Force
English to SI SI to English 1 1bf ＝ 4.45 N 1 N ＝ 0.225 lbf
Angular Velocity
English to SI SI to English 1 rpm ＝ 0.105 rad/s 1 rad/s ＝ 9.55 rpm
Constants：
Constant Name Definition Constant Name Definition Absolute zero temperature 0 K = −273.15 °C Electron radius re = 2.81792 × 10-^15 Speed of light in vacuum c = 2.99792458 × 10^8 m·s-^1 Molar gas constant R = 8.314472 J·mol-^1 ·K-^1 Newtonian constant of gravitation G = 6.6742 × 10−^11 m^3 ·kg-^1 s-^2 Molar Volume Vmol = 22.41383 m^3 ·kmol-^1 Planck constant h = 6.6260693 × 10−^34 J·Hz-^1 = 4.136 × 10-^15 eV·s; Mass of an electron m e = 9.1093897 × 10-^31 kg Planck constant over 2π (^) = 1.05457148 × 10−^34 J·s Mass of a proton m p = 1.6726231 × 10-^27 kg Elementary charge e = 1.60217653 × 10−^19 C Mass of a neutron m n = 1.6749286 × 10-^27 kg Avogadro constant NA = 6.0221415 × 10^23 mol-^1 Permeability of vacuum μ 0 = 4 π × 10−^7 T^2 ·m^3 ·J-^1 = 12.566370614 × 10−^7 T^2 ·m^3 ·J-^1 Constant in Coulomb's law K = 8.988 × 10^9 N·m^2 ·kg-^2 Permittivity of vacuum ε 0 = 1/( μ 0 c^2 ) = 8.854187817 × 10 −^12 C^2 ·J-^1 ·m-^1 Boltzmann's constant k = 1.3806505 × 10−^23 J K-^1 Fine structure constant α = e^2 /(2 ε 0 hc ) = 1/137.0359895 = 7.2974 × 10-^3 Stefan-Boltzmann constant σ = 5.670400 × 10−^8 W·m-^2 ·K-^4 Thomson cross-section σ e = 6.652 × 10−^29 m^2 Unified atomic mass unit 1 u = 1.66056×10−^27 kg Bohr radius a 0 = 5.292 × 10−^11 m
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