Transistor Switch Saturation Calculator

Rc (Collector resistor) (KΩ) 
VP (Positive Voltage) (V)
Beta(min) (Current gain) amplification factor, current gain
VBE (Base to emitter drop) Base-emitter voltage drop (V)

Rb (Base resistor) (KΩ) 

To saturate with the load current, the base current must be Ib = Ic/Beta. Transistors have different gains, so we want to use the lowest value of Beta to ensure saturation.

Rb= (VP-VBE)/Ib= (VP-VBE)*amplification factor/Ic= (VP-VBE)*amplification factor*Rc/VP