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 | 0.1333 | 7.501 |
Pressure | mm mercury | Pa | 133.3 | 7.501E-03 |
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 |
Thermal diffusivity | ft^2/day | m^2/day | 0.09290304 | 10.7639104 |
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 |