I can run the precise math to give you the exact values you need.

), the internal switching thresholds typically create a natural log multiplier close to

Only works for the single-capacitor, one-inverter RC oscillator. Doesn’t cover crystal oscillators or multivibrators with two inverters.

f≈11.2⋅R⋅Cf is approximately equal to the fraction with numerator 1 and denominator 1.2 center dot cap R center dot cap C end-fraction

Before using the calculator, it is important to understand the circuit topology. To create an oscillator with the 74HC14, you use one of the six inverters on the chip in the following configuration: