555 Timer Calculator
Calculate timing values for 555 timer circuits
Timer Calculator
Configure component values for your 555 timer circuit
555 Timer Reference
How 555 timer circuits work
Astable Mode Formulas:
- Frequency: f = 1.44/((R₁ + 2R₂) × C)
- Period: T = 0.693 × (R₁ + 2R₂) × C
- Duty Cycle: (R₁ + R₂)/(R₁ + 2R₂) × 100%
Monostable Mode Formula:
- Pulse Width: T = 1.1 × R × C
Common Applications:
- LED flashers and oscillators
- PWM generation for motor control
- Timing delays and pulse generation
- Tone generators and alarm circuits
The 555 timer IC is one of the most versatile integrated circuits ever created, with billions manufactured since its invention in 1971.
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