IC 555 Astable Timer Calculator

Online calculator which helps to calculate the time out value (delay) of the IC 555 timer in astable mode circuit from the resistance and capacitance values.

Find Time Out / Delay in Astable Circuit

Sec
Sec
Sec
Hz
%
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Formula:

T1 = 0.7(R1+R2)*C
T2 = 0.7*R1*C
T = 0.7(R1+R2)*C
F = 1.45 / ((R1+2R2)*C)
D =0.1-((0.1*R2) / (R1+(2R2)));
Where, T1 = High Period, T2 = Low Period, T = Total Period, F = Frequency, D = Duty,

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