Engineering Unit Conversions

Temperature | Length | Weight | Pressure | Density
Thermal Conductivity | Coefficient of Linear Thermal Expansion

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Temperature
Enter a number in either field, then click outside the text box.

°Fahrenheit    ó    °Celsius

°Celsius    ó    °Kelvin

for reference, -40 °F = -40 °C
in size, 1 ° C is equal to 1.8 °F
Absolute Zero = -459.4 °F = -273 °C = 0 °K


Length
Enter a number in either field, then click outside the text box.

inches    ó    mm

feet    ó    meters

1 meter = 39.37 inches = 3.281 feet
1 foot = 0.3058 meters = 30.58 cm = 305.8 mm
1 inch = 2.54 cm = 25.4 mm
.001 inch = 1 mil = 0.0254 mm = 25.4 microns (or µm)
.001 mm = 1 micron (or µm) = 10,000 Angstroms
1 mile = 5280 feet = 1609.4 meters


Weight
Enter a number in either field, then click outside the text box.

pounds    ó    kilograms

1 pound = 0.4545 kilogram
1 kilogram = 2.20 pounds
1 gram = 0.0352 ounces = 0.0022 pounds


Pressure (Force/Area)
Enter a number in either field, then click outside the text box.

X 10³ psi    ó    MPa

X 10³ psi    ó    kg/cm²

1 psi = 1 pound per square inch = 6895 Pa (Pascal)
1 kpsi = 1 X 10³ psi = 6895 KPa = 6.9 MPa
1 MPa = 1 X 10³ KPa = 1 X 10⁶ Pa
1 kpsi = 70.03 kg/cm² (kilograms per square centimeter)
1 Pa = 1 Newton per square meter
.98 MPa = 10.0 kg/cm²   or   1 MPa = 10.20 kg/cm²
1 atm = 14.7 psi = 101,325 Pascals = 760 mm Hg = 760 torr


Density
Enter a number in either field, then click outside the text box.

lb/in³    ó    g/cm³

1 lb/in³ = 27.67 g/cm³
Specific Gravity = ratio of density of material to density of water
(therefore, SpG of water = 1.00 by definition)
materials with density < 1.00 will float on water
materials with density > 1.00 will sink in water


Thermal Conductivity
Enter a number in either field, then click outside the text box.

BTU-in/ft²-hr-°F    ó    X 10^{- 4} cal-cm/cm²-sec-°C

BTU-in/ft²-hr-°F    ó    W/m-°C

1 BTU-in/ft²-hr-°F = 3.445 X 10^{- 4} cal-cm/cm²-sec-°C
1 cal-cm/cm²-sec-°C = 2902.92 BTU-in/ft²-hr-°F
1 W/m-°K = 6.933 BTU-in/ft²-hr-°F
1 BTU-in/ft²-hr-°F = 0.144 W/m-°K
(higher number = better conductor = poorer insulator)


Coefficient of Linear Thermal Expansion (CLTE)
Enter a number in either field, then click outside the text box.

in/in-°F    ó    mm/mm-°C

Linear Dimensional Change = CLTE times Temperature Change (in degrees)
(higher CLTE = material expands and contracts more with temperature changes)
NOTE: CLTE's are VERY small numbers that are usually expressed
in negative powers of 10. For example, 1 X 10^{- 5} = 0.00001 = 10 ppm
1 X 10^-6 = 0.000001 = 1 ppm (part per million)

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