# How to Calculate the Collector Current, Ic, of a Transistor

The collector current, Ic, of a transistor is the amplified output current of a bipolar junction transistor.

There are several ways to find the collector current, Ic, of a transistor. And it all depends on what information is already known about the transistor:

### 1st Way to Calculate Collector Current Ic

**Using Known Values**

If the base current, Ib, and β are known, then Ic can be computed by the following formula:

**Example**

If Ib=35μa and β=100, then Ic calculates out to be:

### 2nd Way to Calculate Collector Current Ic

**Using Known Values**

If the emitter current, Ie, and β are known, then Ic can be computed by the following formula:

**Example**

If Ie=4ma and β=150, then the value of Ic is computed to be:

### 3rd Way to Calculate Collector Current Ic

**Using Known Values**

If base current, Ib, and emitter current, Ie, are known, then Ic can be calculated by the formula:

**Example**

If Ie=4ma and Ib=30μa, then Ic calculates out to be:

Related Resources

How to Calculate the Base Current IB of a BJT Transistor

How to Calculate the Emitter Current IF of a BJT Transistor

How to Calculate β of a BJT Transistor

How to Calculate α of a BJT Transistor

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