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Online Calculator
555 astable timer calculator
Enter R₁, R₂, and C to estimate the behavior of a 555 timer in classic astable mode.
Classic astable 555 timer model with two resistors and a capacitor.
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Local processing
The values are processed directly in your browser.
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Frequently asked questions
What does it calculate?
Frequency, period, high time, low time, and duty cycle.
What formula do you use for times?
tALTO≈0,693(R₁+R₂)C and tBAJO≈0,693R₂C.
Is this an ideal model?
Yes.
What units does it use?
Enter values in ohms and microfarads.