555 Timer Calculator
Calculate 555 timer circuits — astable oscillator frequency, duty cycle, and monostable pulse width with component design, circuit diagrams, and waveform preview
Component Values
10 kΩ
47 kΩ
Astable Circuit
Output Waveform
555 Timer Formulas
Astable (Free-Running)
t_high = 0.693 × (R1 + R2) × Ct_low = 0.693 × R2 × Cf = 1.44 / ((R1 + 2×R2) × C)D = (R1 + R2) / (R1 + 2×R2) × 100%Monostable (One-Shot)
t = 1.1 × R × CWhere R is in ohms and C is in farads. The 0.693 constant is ln(2) and 1.1 constant is approximately ln(3).
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