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Conversion Factors

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This table gives conversion factors to convert various units to their SI equivalents. It will not be very useful for people who prefer to use cgs or English units although it can be used to convert from SI to those systems.

Name To convert from to multiply by divide by
Acceleration ft/sec^2 m/s^2 0.3048 3.2810
Area acre m^2 4047 2.471E-04
Area ft^2 m^2 9.294E-02 10.7600
Area hectare m^2 1.000E+04 1.000E-04
Area in^2 m^2 6.452E-04 1550
Density g/cm^3 kg/m^3 1000 1.000E-03
Density lbm/ft^3 kg/m^3 16.02 6.243E-02
Density lbm/in^3 kg/m^3 2.767E+04 3.614E-05
Density lb s^2/in^4 kg/m^3 1.069E+07 9.357E-08
Density slug/ft^3 kg/m^3 515.40 1.940E-03
Energy BTU J 1055 9.478E-04
Energy cal J 4.1859 0.2389
Energy erg J 1.000E-07 1.000E+07
Energy ev J 1.602E-19 6.242E+18
Energy ft lbf J 1.3557 0.7376
Energy kiloton TNT J 4.187E+12 2.388E-13
Energy kW hr J 3.600E+06 2.778E-07
Energy megaton TNT J 4.187E+15 2.388E-16
Force dyne N 1.000E-05 1.000E+05
Force lbf N 4.4484 0.2248
Force ozf N 0.2780 3.5968
Heat capacity BTU/lbm F J/kg C 4188 2.388E-04
Heat transfer coefficient BTU/hr ft^2 F W/m^2 C 5.6786 0.1761
Length AU m 1.496E+11 6.685E-12
Length ft m 0.3048 3.2810
Length in m 2.540E-02 39.3700
Length mile m 1609 6.214E-04
Length Nautical mile m 1853 5.397E-04
Length parsec m 3.085E+16 3.241E-17
Mass amu kg 1.661E-27 6.022E+26
Mass lbm kg 0.4535 2.2050
Mass lb s^2/in kg 1200.00 5.711E-03
Mass slug kg 14.59 6.853E-02
Mass flow rate lbm/hr kg/s 1.260E-04 7937
Mass flow rate lbm/sec kg/s 0.4535 2.2050
Moment of inertia ft lb s^2 kg m^2 1.3557 0.7376
Moment of inertia in lb s^2 kg m^2 0.1130 8.8510
Moment of inertia oz in s^2 kg m^2 7.062E-03 141.60
Power BTU/hr W 0.2931 3.4120
Power hp W 745.71 1.341E-03
Power tons of refrigeration W 3516 2.844E-04
Pressure bar Pa 1.000E+05 1.000E-05
Pressure dyne/cm^2 Pa 0.1000 10.0000
Pressure in. mercury Pa 3377 2.961E-04
Pressure in. water Pa 248.82 4.019E-03
Pressure kgf/cm^2 Pa 9.807E+04 1.020E-05
Pressure lbf/ft^2 Pa 47.89 2.088E-02
Pressure lbf/in^2 Pa 6897 1.450E-04
Pressure mbar Pa 100.00 1.000E-02
Pressure microns mercury Pa 1.3332 0.7501
Pressure mm mercury Pa 1333 7.501E-04
Pressure std atm Pa 1.013E+05 9.869E-06
Specific heat BTU/lbm F J/kg C 4186 2.389E-04
Specific heat cal/g C J/kg C 4186 2.389E-04
Temperature F C 0.5556 1.8000
Thermal conductivity BTU/hr ft F W/m C 1.7307 0.5778
Thermal conductivity BTU in/hr ft^2 F W/m C 0.1442 6.9340
Thermal conductivity cal/cm s C W/m C 418.60 2.389E-03
Thermal conductivity cal/ft hr F W/m C 6.867E-03 145.62
Time day s 8.640E+04 1.157E-05
Time sidereal year s 3.156E+07 3.169E-08
Torque ft lbf N m 1.3557 0.7376
Torque in lbf N m 0.1130 8.8504
Torque in ozf N m 7.062E-03 141.61
Velocity ft/min m/s 5.079E-03 196.90
Velocity ft/s m/s 0.3048 3.2810
Velocity km/hr m/s 0.2778 3.6000
Velocity miles/hr m/s 0.4470 2.2370
Viscosity - absolute centipose N s/m^2 1.000E-03 1000
Viscosity - absolute g/cm s N s/m^2 0.1000 10
Viscosity - absolute lbf/ft^2 s N s/m^2 47.87 2.089E-02
Viscosity - absolute lbm/ft s N s/m^2 1.4881 0.6720
Viscosity - kinematic centistoke m^2/s 1.000E-06 1.000E+06
Viscosity - kinematic ft^2/sec m^2/s 9.294E-02 10.7600
Volume ft^3 m^3 2.831E-02 35.3200
Volume in^3 m^3 1.639E-05 6.102E+04
Volume liters m^3 1.000E-03 1000
Volume U.S. gallons m^3 3.785E-03 264.20
Volume flow rate ft^3/min m^3/s 4.719E-04 2119
Volume flow rate U.S. gallons/min m^3/s 6.309E-05 1.585E+04

Material constants


Back to contents This table gives various material properties listed alphabetically. The units are SI.
Conductivity Acetyl 0.2300 W/m C
Conductivity Acrylic 0.1400 W/m C
Conductivity Aluminum 2024-T3 190.40 W/m C
Conductivity Aluminum 3003 0.4000 W/m C
Conductivity Aluminum 6061-T6 155.80 W/m C
Conductivity Aluminum 7079-T6 121.10 W/m C
Conductivity Beryllium QMV 147.10 W/m C
Conductivity Borosilicate glass 1.1300 W/m C
Conductivity Borosilicate glass (Tempax) 1.1300 W/m C
Conductivity Concrete (sand & gravel) 1.8000 W/m C
Conductivity Copper - pure 392.90 W/m C
Conductivity Diamond 550.00 W/m C
Conductivity Douglas fir 0.1100 W/m C
Conductivity Dow Corning 200 (350cSt) 0.1590 W/m C
Conductivity Dow Corning 739 0.1900 W/m C
Conductivity Dow Corning 93-500 0.1500 W/m C
Conductivity Dow Corning Q3-6605 0.8400 W/m C
Conductivity Epoxy (Epotek 353ND) 0.0490 W/m C
Conductivity Epoxy (Masterbond 11A0) 1.4400 W/m C
Conductivity Glass wool 0.0400 W/m C
Conductivity Gold - pure 297.70 W/m C
Conductivity Helium 2.7700 W/m C
Conductivity Ice 2.2000 W/m C
Conductivity Iron 83.50 W/m C
Conductivity Lead - pure 37.04 W/m C
Conductivity Limestone 0.5000 W/m C
Conductivity Magnesium HK31A-H24 114.20 W/m C
Conductivity Magnesium AZ31B-H24 95.19 W/m C
Conductivity Methane 0.3030 W/m C
Conductivity Molybdenum - wrought 143.60 W/m C
Conductivity Nickel - pure 91.73 W/m C
Conductivity Nitrogen 0.1460 W/m C
Conductivity Nylon 0.2400 W/m C
Conductivity Platinum 69.23 W/m C
Conductivity Polycarbonate 0.2000 W/m C
Conductivity Polypropylene 0.4000 W/m C
Conductivity Polystyrene foam 0.3600 W/m C
Conductivity Polyurethane foam 0.0260 W/m C
Conductivity PTFE 0.2400 W/m C
Conductivity Quartz 1.3200 W/m C
Conductivity SiC Alpha 77.50 W/m C
Conductivity SiC sintered KT 80.00 W/m C
Conductivity Silastic E 0.1800 W/m C
Conductivity Silastic L 0.2800 W/m C
Conductivity Silicone foam (Poron) 0.0600 W/m C
Conductivity Silver - pure 417.10 W/m C
Conductivity Snow (light) 0.6000 W/m C
Conductivity Snow (packed) 2.2000 W/m C
Conductivity Soil (coarse) 0.5200 W/m C
Conductivity Soil (dry w/stones) 0.5200 W/m C
Conductivity Soil (dry) 0.2300 W/m C
Conductivity Soil (w/42% water) 1.1000 W/m C
Conductivity Steel AISI 304 16.27 W/m C
Conductivity Steel AISI C1020 46.73 W/m C
Conductivity Tantalum 53.65 W/m C
Conductivity Titanium B 120VCA 7.4420 W/m C
Conductivity Tungsten 164.40 W/m C
Conductivity Water 0.6030 W/m C
Conductivity White pine 0.1100 W/m C
Density Acrylic 1400 kg/m^3
Density Air (2800 m) 0.9800 kg/m^3
Density Air (STP) 1.2930 kg/m^3
Density Aluminum 2024-T3 2770 kg/m^3
Density Aluminum 3003 2700 kg/m^3
Density Aluminum 6061-T6 2700 kg/m^3
Density Aluminum 7079-T6 2740 kg/m^3
Density Ammonia - liquid 682.10 kg/m^3
Density Argon - liquid 1390 kg/m^3
Density Beryllium QMV 1850 kg/m^3
Density Borosilicate Ohara E6 2180 kg/m^3
Density Borosilicate Tempax 2230 kg/m^3
Density Concrete 2242 kg/m^3
Density Copper - pure 8900 kg/m^3
Density Dow Corning 200 (350cSt) 968.00 kg/m^3
Density Fused silica 2200 kg/m^3
Density Glass wool 64.00 kg/m^3
Density Gold - pure 1.932E+04 kg/m^3
Density Helium - liquid 125.00 kg/m^3
Density Hydrogen - liquid 70.00 kg/m^3
Density Iron 7830 kg/m^3
Density Lead - pure 1.134E+04 kg/m^3
Density Magnesium AZ31B-H24 1770 kg/m^3
Density Magnesium HK31A-H24 1790 kg/m^3
Density Methane - liquid 424.00 kg/m^3
Density Molybdenum - wrought 1.030E+04 kg/m^3
Density Neon - liquid 1200 kg/m^3
Density Nickel - pure 8900 kg/m^3
Density Nitrogen - liquid 804.00 kg/m^3
Density Nylon 1700 kg/m^3
Density Platinum 2.145E+04 kg/m^3
Density Polycarbonate 1300 kg/m^3
Density Polyethylene 2300 kg/m^3
Density PTFE 1200 kg/m^3
Density SiC Alpha 2975 kg/m^3
Density SiC sintered KT 2975 kg/m^3
Density Silver - pure 1.050E+04 kg/m^3
Density Steel AISI 304 8030 kg/m^3
Density Steel AISI C1020 7850 kg/m^3
Density Tantalum 1.660E+04 kg/m^3
Density Titanium B 120VCA 4850 kg/m^3
Density Tungsten 1.930E+04 kg/m^3
Density Water (4 C) 999.97 kg/m^3
Density White pine 513.00 kg/m^3
Elastic modulus Aluminum 2024-T3 7.310E+10 Pa
Elastic modulus Aluminum 6061-T6 7.310E+10 Pa
Elastic modulus Aluminum 7079-T6 7.172E+10 Pa
Elastic modulus Beryllium QMV 2.897E+11 Pa
Elastic modulus Borosilicate Ohara E6 5.743E+10 Pa
Elastic modulus Borosilicate Tempax 6.200E+10 Pa
Elastic modulus Copper - pure 1.172E+11 Pa
Elastic modulus Gold - pure 7.448E+10 Pa
Elastic modulus Lead - pure 1.379E+10 Pa
Elastic modulus Magnesium AZ31B-H24 4.483E+10 Pa
Elastic modulus Magnesium HK31A-H24 4.414E+10 Pa
Elastic modulus Molybdenum - wrought 2.759E+11 Pa
Elastic modulus Nickel - pure 2.207E+11 Pa
Elastic modulus Platinum 1.469E+11 Pa
Elastic modulus SiC Alpha 4.760E+11 Pa
Elastic modulus SiC sintered KT 3.320E+11 Pa
Elastic modulus Silver - pure 7.241E+10 Pa
Elastic modulus Steel AISI 304 1.931E+11 Pa
Elastic modulus Steel AISI C1020 2.034E+11 Pa
Elastic modulus Tantalum 1.862E+11 Pa
Elastic modulus Titanium B 120VCA 1.021E+11 Pa
Elastic modulus Tungsten 3.448E+11 Pa
Electrical resistivity Aluminum 2017 4.000E-08 ohm m
Electrical resistivity Aluminum 3003 4.000E-08 ohm m
Electrical resistivity Aluminum 99.996% 2.655E-08 ohm m
Electrical resistivity Copper 1.673E-08 ohm m
Electrical resistivity Nickel ASTM B160 1.000E-07 ohm m
Electrical resistivity Steel AISI 304 7.200E-07 ohm m
Electrical resistivity Steel AISI C1020 1.000E-07 ohm m
Heat capacity Air 1006 J/kg C
Heat capacity Aluminum 2024-T3 963.00 J/kg C
Heat capacity Aluminum 6061-T6 963.00 J/kg C
Heat capacity Aluminum 7079-T6 963.00 J/kg C
Heat capacity Beryllium QMV 1884 J/kg C
Heat capacity Borosilicate glass 710.00 J/kg C
Heat capacity Concrete 1000 J/kg C
Heat capacity Copper - pure 385.00 J/kg C
Heat capacity Dow Corning 200 (350 cST) 1465 J/kg C
Heat capacity Ethanol (25 C) 2453 J/kg C
Heat capacity Gold - pure 130.00 J/kg C
Heat capacity Ice 2093 J/kg C
Heat capacity Iron 440.00 J/kg C
Heat capacity Lead - pure 130.00 J/kg C
Heat capacity Magnesium AZ31B-H24 1047 J/kg C
Heat capacity Magnesium HK31A-H24 544.00 J/kg C
Heat capacity Methanol (25 C) 2547 J/kg C
Heat capacity Molybdenum - wrought 293.00 J/kg C
Heat capacity Nickel - pure 461.00 J/kg C
Heat capacity Platinum 130.00 J/kg C
Heat capacity SiC Alpha 1300 J/kg C
Heat capacity SiC sintered KT 1340 J/kg C
Heat capacity Silica (0 C) 937.00 J/kg C
Heat capacity Silver - pure 235.00 J/kg C
Heat capacity Steel AISI 304 503.00 J/kg C
Heat capacity Steel AISI C1020 419.00 J/kg C
Heat capacity Tantalum 126.00 J/kg C
Heat capacity Titanium B 120VCA 544.00 J/kg C
Heat capacity Tungsten 138.00 J/kg C
Heat capacity Water 4216 J/kg C
Heat of combustion Methane 55.70 MJ/kg
Heat of combustion Octane 47.70 MJ/kg
Heat of fusion Nitrogen 25.50 kJ/kg
Heat of fusion Water 334.00 kJ/kg
Heat of vaporization Ammonia 1368 kJ/kg
Heat of vaporization Argon 162.76 kJ/kg
Heat of vaporization Helium 23.93 kJ/kg
Heat of vaporization Hydrogen 451.90 kJ/kg
Heat of vaporization Methane 577.40 kJ/kg
Heat of vaporization Neon 87.03 kJ/kg
Heat of vaporization Nitrogen 199.20 kJ/kg
Heat of vaporization Water (100 C) 2258 kJ/kg
Heat transfer coef. Air v = 0 m/s 5.6000 W/ C m^2
Heat transfer coef. Air v = 3.4 m/s 18.90 W/ C m^2
Heat transfer coef. Air v = 6.7 m/s 38.00 W/ C m^2
Kinematic viscosity Air (101 kPa) 1.800E-05 m^2/s
Kinematic viscosity Dow Corning 200 (350cSt) 1.121E-07 m^2/s
Kinematic viscosity Water (0 C) 1.753E-06 m^2/s
Poisson's ratio Aluminum 2024-T3 0.3300
Poisson's ratio Aluminum 6061-T6 0.3300
Poisson's ratio Aluminum 7079-&6 0.3300
Poisson's ratio Beryllium QMV 0.0300
Poisson's ratio Borosilicate Ohara E6 0.1950
Poisson's ratio Borosilicate Tempax 0.2200
Poisson's ratio Copper - pure
Poisson's ratio Gold - pure 0.4200
Poisson's ratio Lead - pure 0.4200
Poisson's ratio Magnesium AZ31B-H24 0.3500
Poisson's ratio Magnesium HK31A-H24 0.3500
Poisson's ratio Molybdenum - wrought 0.3200
Poisson's ratio Nickel - pure
Poisson's ratio Platinum 0.3900
Poisson's ratio Silver - pure 0.3700
Poisson's ratio Steel AISI 304 0.2900
Poisson's ratio Steel AISI C1020 0.2900
Poisson's ratio Tantalum 0.3500
Poisson's ratio Titanium B 120VCA 0.3000
Poisson's ratio Tungsten 0.2800
Thermal expansion coefficient Aluminum 2024-T3 22.68 microns/m C
Thermal expansion coefficient Aluminum 6061-T6 24.30 microns/m C
Thermal expansion coefficient Aluminum 7079-T6 24.66 microns/m C
Thermal expansion coefficient Beryllium QMV 14.94 microns/m C
Thermal expansion coefficient Borosilicate E6 -30 to +70C 2.8000 microns/m C
Thermal expansion coefficient Copper - pure 16.56 microns/m C
Thermal expansion coefficient Gold - pure 4.39 microns/m C
Thermal expansion coefficient Lead - pure 52.74 microns/m C
Thermal expansion coefficient Magnesium AZ31V-H24 26.10 microns/m C
Thermal expansion coefficient Magnesium HK31A-H24 25.20 microns/m C
Thermal expansion coefficient Molybvdenum - wrought 5.4000 microns/m C
Thermal expansion coefficient Nickel - pure 12.96 microns/m C
Thermal expansion coefficient Platinum 9.0000 microns/m C
Thermal expansion coefficient SiC Alpha 4.0000 microns/m C
Thermal expansion coefficient SiC sintered KT 5.0000 microns/m C
Thermal expansion coefficient Silver - pure 19.80 microns/m C
Thermal expansion coefficient Steel AISI 304 17.82 microns/m C
Thermal expansion coefficient Steel AISI C1020 11.34 microns/m C
Thermal expansion coefficient Tantalum 6.4800 microns/m C
Thermal expansion coefficient Titanium B 120VCA 9.3600 microns/m C
Thermal expansion coefficient Tungsten 4.5000 microns/m C
Viscosity Air (0 C,101 kPa) 1.708E-05 N s/m^2
Viscosity Carbon dioxide (0 C,101 kPa) 1.390E-05 N s/m^2
Viscosity Helium (0 C,101 kPa) 1.860E-05 N s/m^2
Viscosity Hydrogen (0 C,101 kPa) 8.345E-06 N s/m^2
Viscosity Methane (0 C,101 kPa) 1.026E-05 N s/m^2
Viscosity Nitrogen (0 C,101 kPa) 1.660E-05 N s/m^2
Viscosity Oxygen (0 C,101 kPa) 1.919E-05 N s/m^2
Viscosity Benzene (0 C) 9.121E-04 N s/m^2
Viscosity Carbon tetrachloride (0 C) 1.346E-03 N s/m^2
Viscosity Glycerin (0 C) 12.07 N s/m^2
Viscosity Kerosene (0 C) 2.959E-03 N s/m^2
Viscosity Mercury (0 C) 1.685E-03 N s/m^2
Viscosity Oil - light machine (0 C) 0.3534 N s/m^2
Viscosity Water (0 C) 1.753E-03 N s/m^2

Physical constants

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This is a short list of physical constants in SI units.

Avogadro's number N 6.02E+23 mole^-1
Boltzmann constant k 1.381E-23 J/ K
Electric charge e 1.602E-19 coul
Gas constant R 8.3145 J/ K mole
Gravitation G 6.672E-11 N m^2/kg^2
Mass electron 9.11E-31 kg
Mass proton 1.67E-27 kg
Mass neuton 1.68E-27 kg
Mass alpha-particle 6.64E-27 kg
Plank's h 6.626E-34 J s
Plank's hc 1.986E-25 J m
Plank's hc/k 1.439E-02 m C
Radiation constant hc^2 5.955E-17 W m^2
Speed of light c 2.998E+08 m/s
Stefan-Boltzmann sigma 5.6705E-08 W/m^2 K^4

Astronomical constants

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This is a short list of astronomical constants in SI units.

Acceleration Sea level 9.8067 m/s^2
Luminosity Sun 3.826E+26 J/s
Mass Sun 1.989E+30 kg
Mass Earth 5.976E+24 kg
Pressure Sea level 1.013E+05 Pa
Radius Earth 6.371E+06 m
Radius Sun 6.970E+08 m
Velocity Earth's orbital 2.978E+04 m/s

Other tables

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  • NASA Constants and Equations for Calculations
  • WebElements Periodic Table 
    • Date created: 9/26/95

Last modified: 04/05/98

Copyright © 1995, 1996, 1997, 1998 Walter A. Siegmund

Walter A. Siegmund