How to Calculate β (Beta) of a Transistor

Beta of a transistor

β (beta), the gain or amplification factor of a transistor, normally is given when solving a circuit equation. However, if it is not given, it can be calculated if the currents, Ib (the base current) and either Ie ( the emitter current) or Ic (the collector current) are known.

If Ib and Ic are known, then β can be calculated by the formula:


How to calculate beta from Ic

If Ib and Ie are known, then β can be calculate by the formula:


calculating beta from ie emitter current

Example

If Ic=6ma and Ib=30μa, then:

calculating beta from collector and base current example


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