How does the Timer N E555 Calculator work?

Astable: freq = 1.44 ÷ ((R1 + 2×R2) × C) Then: Monostable: pulse width = 1.1 × R × C Then: Select R and C values for desired frequency/width Then: Standard values: 1k-100k ohms, 10nF-100µF capacitors.

Can you give an example of how to use the Timer N E555 Calculator?

Example: Input R1=10k, R2=10k, C=100n gives a result of f=724Hz.

Is the Timer N E555 Calculator free to use?

Yes — completely free with no registration, download, or subscription required. All calculations happen instantly in your browser.

How accurate is the Timer N E555 Calculator?

Our Timer N E555 Calculator uses verified mathematical formulas and is accurate to multiple decimal places. Results are calculated in real-time using the same methods used by professionals.

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Timer N E555 Calculator

555 Timer Astable Frequency

R1 (Ω)

R2 (Ω)

C (µF)

Designs NE555 timer circuits in astable (oscillator) or monostable (pulse) mode. Generates precise timing for diverse applications.

Symbol	Name	Unit	Description
R1	R1 value	—	Variable used in the calculation
R2	R2 value	—	Variable used in the calculation
C	C value	—	Variable used in the calculation

Difficulty:intermediate

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Did You Know?

NE555 is over 50 years old, still ubiquitous; billions sold; design hasn't changed.

References

›NE555 Calculator

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Timer N E555 Calculator

555 Timer Astable Frequency

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555 Timer Astable Frequency