All Conversion Factors

Name To convert from to multiply by divide by
Acceleration ft/sec² m/s² 0.3048 3.281
Area acre m² 4,047 0.0002471
Area ft² m² 0.09294 10.76
Area hectare m² 10,000 0.0001
Area in² m² 0.0006452 1550
Density g/cm³ kg/m³ 1,000 0.001
Density lbm/ft³ kg/m³ 16.02 0.06243
Density lbm/in³ kg/m³ 27,670 0.00003614
Density lb*s²/in³ kg/m³ 1.069E+07 9.357E-08
Density slug/ft³ kg/m³ 515.4 0.00194
Energy BTU J 1,055 .0009478
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 100,000 0.00001
Force lbf N 4.4484 0.2248
Force ozf N 0.2780 3.5968
Heat capacity BTU/lbm*°F J/kg*°C 4,188 .0002388
Heat transfer coefficient BTU/hr*ft²*°F W/m²*°C 5.6786 0.1761
Length AU m 1.496E+11 6.685E-12
Length ft m 0.3048 3.281
Length in m .0254 39.37
Length mile m 1,609 .0006214
Length Nautical mile m 1,853 .0005397
Length parsec m 3.085E+16 3.241E-17
Mass amu kg 1.661E-27 6.022E+26
Mass lbm kg 0.4535 2.205
Mass lb*s²/in kg 1,200 .005711
Mass slug kg 14.59 .06853
Mass flow rate lbm/hr kg/s .0001260 7,937
Mass flow rate lbm/sec kg/s 0.4535 2.205
Moment of inertia ft*lb*s² kg*m² 1.3557 0.7376
Moment of inertia in*lb*s² kg*m² 0.113 8.851
Moment of inertia oz*in*s² kg*m² 0.007062 141.60
Power BTU/hr W 0.2931 3.412
Power hp W 745.71 0.001341
Power tons of refrigeration W 3516 0.0002844
Pressure bar Pa 100,000 0.00001
Pressure dyne/cm² Pa 0.1 10
Pressure in. mercury Pa 3,377 0.0002961
Pressure in. water Pa 248.82 0.004019
Pressure kgf/cm² Pa 98,070 0.0000102
Pressure lbf/ft² Pa 47.89 0.02088
Pressure lbf/in² Pa 6,897 0.0001450
Pressure mbar Pa 100 0.01
Pressure microns mercury Pa 0.1333 7.501
Pressure mm mercury Pa 133.3 0.007501
Pressure std atm Pa 101,300 0.000009869
Specific heat BTU/lbm*°F J/kg*°C 4,186 0.0002389
Specific heat cal/g*°C J/kg*°C 4,186 .0002389
Temperature °F °C 0.556*(°F-32)  
Thermal conductivity BTU/hr*ft*°F W/m*°C 1.7307 0.5778
Thermal conductivity BTU*in/hr*ft²*°F W/m*°C 0.1442 6.934
Thermal conductivity cal/cm*s*°C W/m*°C 418.60 .002389
Thermal conductivity cal/ft*hr*°F W/m*°C 0.006867 145.62
Time day s 86,400 .00001157
Time sidereal year s 31,560,000 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 0.007062 141.61
Velocity ft/min m/s 0.005079 196.9
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/m² 0.001 1,000
Viscosity - absolute g/cm*s N*s/m² 0.1 10
Viscosity - absolute lbf/ft²*s N*s/m² 47.87 .02089
Viscosity - absolute lbm/ft*s N*s/m² 1.4881 0.672
Viscosity - kinematic centistoke m²/s 0.000001 1,000,000
Viscosity - kinematic ft²/sec m²/s 0.09294 10.76
Volume ft³ m³ 0.02831 35.3200
Volume in³ m³ 0.00001639 61,020
Volume liters m³ 0.001 1,000
Volume U.S. gallons m³ 0.003785 264.2
Volume flow rate ft³/min m³/s 0.0004719 2,119
Volume flow rate U.S. gallons/min m³/s 0.00006309 15,850