IC 555 Astable Timer Calculator

Online calculator assists in determining the time-out value (delay) of the IC 555 timer

This online calculator assists in determining the time-out value (delay) of the IC 555 timer in an astable mode circuit, based on the given resistance and capacitance values. It enables you to calculate the precise timing parameters for your circuit configuration.

Resistance
R1
Resistance
R2
Capacitance
C
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    7 Number of calculations

    • 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,