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555 Timer Modes Monostable vs Astable Operation with Interactive Calculator

Posted by

Ekostra Electronics

September 12, 2025

On September 12, 2025

555 Timer Calculator

Calculate values for Astable and Monostable modes

Configuration

Select Mode:

Resistor R1:

Example: 1kΩ for typical circuits

Resistor R2:

Example: 1kΩ for typical circuits

Capacitor C:

Example: 10μF for typical circuits

Output Unit:

Results

Period: -

Frequency: -

Duty Cycle: -

Time High: -

Time Low: -

Astable Mode Equations:
Frequency = 1.44 / ((R₁ + 2R₂) × C)
Duty Cycle = (R₁ + R₂) / (R₁ + 2R₂) × 100%
t_high = 0.693 × (R₁ + R₂) × C
t_low = 0.693 × R₂ × C

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Configuration

Results