555 Monostable Circuit Calculator

The 555 timer is capable of being used in astable and monostable circuits. In a monostable circuit, the output voltage becomes high for a set duration once a falling edge is detected on the trigger pin (pin 2).

555 monostable output

The Output Pulse Width (T) is calculated with the following formula

T = 1.1 * R * C

Enter any two known values and press "Calculate" to solve for the others.

Seconds (s)
Click "Calculate" to update the fields with orange borders.