555 Timer Astable Calculator
Frequency, period, duty cycle and high/low times for a 555 timer in astable mode.
How to use the 555 Timer Astable Calculator
- Enter or select: R1, R2, C.
- The results (Frequency, Period, High time, Low time, Duty cycle) are calculated instantly as you type.
- Use “Copy link” to share the calculation with the same input values.
Formula
- t_high = ln2·(R1 + R2)·C
- t_low = ln2·R2·C
- f = 1.44/((R1 + 2R2)C)