555 Astable Calculator
![](https://u7u4x2b3.rocketcdn.me/wp-content/uploads/2023/12/555astable-scaled-e1703198075111.webp)
Use this calculator to find out the time period, capacitor, or resistor values needed to make a 555 astable oscillator.
Be careful when calculating for the passives, as some combinations are physically impossible (you will get negative resistances)!
Solve For: | ||
Time Period | ||
C1 | ||
R1 | ||
R2 | ||
Result | Ready! | |
Frequency | N/A | |
Duty Cycle | N/A | |
On Time | N/A | |
Off Time | N/A | |
T = 0.693 \times C_1 \times (R_1 + 2 R_2)