# 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.

Measurement TypeConversion FactorsReverse Conversion Factors
Length1mm = 0.03937in1in = 25.4mm
Area1mm² = 0.00155in²
1in2 = 645.16mm²
Volume

1mm³ = 61.02 x 10-6

1 litre = 1 x 106mm³

1in3 = 16387mm³

1ml = 1cm³

Force and Mass

1N = 0.101972kgf

1kgf = 9.80665N

1kg = 2.2046lb

1lbf = 4.4482N

1N = 0.2248lbf

1lb = 0.4536kg

Torque

1Nm = 8.8507lbfin

1Nm = 141.612ozfin

1Nm = 10197.16gfcm

1lbfin = 0.1130Nm

1ozin = 0.00706Nm

Power

1kW = 1.360PS (metric PS)

1kW = 1.341hp

1hp = 0.7457kW
Moment of Inertia

1kgm² = 54674.75ozins²

1gcm² = 5.467 x 10-3ozin²

1kgm² = 23.73lbft²

1ozins² = 18.29 x 10-6kgm²

1ozin² = 182.9gcm²

1lb.ft² = 0.0421kgm²

Pressure and Stress

1N/m² = 145 x 10-6lbf/in²

1N/m² = 64.75 x 10-6tonf/in²

1lbf/in² = 6.895 x 10³N/m²

1tonf/in² = 15.44 x 106N/m²

Temperature

°C = (°F-32)*5/9

K = °C+273.15

°F = (°C*9/5)+32

°R = °F+459.67

Angles