Basic Conversion Factors

Selecting the ideal components for your application will often involve calculating certain values. The table below contains a selection of useful conversion factors.

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Measurement Type	Conversion Factors	Reverse Conversion Factors
Length	1mm = 0.03937in	1in = 25.4mm
Area	1mm² = 0.00155in²	1in2 = 645.16mm²
Volume	1mm³ = 61.02 x 10-61 litre = 1 x 106mm³	1in3 = 16387mm³1ml = 1cm³
Force and Mass	1N = 0.101972kgf1kgf = 9.80665N1kg = 2.2046lb	1lbf = 4.4482N1N = 0.2248lbf1lb = 0.4536kg
Torque	1Nm = 8.8507lbfin1Nm = 141.612ozfin1Nm = 10197.16gfcm	1lbfin = 0.1130Nm1ozin = 0.00706Nm
Power	1kW = 1.360PS (metric PS)1kW = 1.341hp	1hp = 0.7457kW
Moment of Inertia	1kgm² = 54674.75ozins²1gcm² = 5.467 x 10-3ozin²1kgm² = 23.73lbft²	1ozins² = 18.29 x 10-6kgm²1ozin² = 182.9gcm²1lb.ft² = 0.0421kgm²
Pressure and Stress	1N/m² = 145 x 10-6lbf/in²1N/m² = 64.75 x 10-6tonf/in²	1lbf/in² = 6.895 x 10³N/m²1tonf/in² = 15.44 x 106N/m²
Temperature	°C = (°F-32)*5/9K = °C+273.15	°F = (°C*9/5)+32°R = °F+459.67
Angles	1rad = 57.3 degrees1mrad = 3.438 arcmins	1 degree = 0.0175 rad1 arcmin = 0.291 mrads