555 Timer Frequency Calculator Astable

Calculate Frequency

This simple 555 timer calculator is for the astable circuit. It will find the frequency in hertz, and period T in seconds. You must enter the values of the capacitor C and resistors R1 and R2. The capacitor value must be in farads, and the resistor values in ohms.

1 µF0.000001 F
1 nF0.000000001 F
1 pF0.000000000001 F

Find Frequency

R1 (Ω):


R2 (Ω):


Capacitance (F):


Period (seconds):


Frequency (Hz):




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