The stability of a crystal oscillator reflects how much its output frequency varies due to factors like temperature, voltage, current, aging, and environmental conditions. Manufacturers specify this parameter in datasheets using ±Hz or ppm (parts per million).

For example, if an oscillator has 100 ppm stability at 100 MHz, the frequency may shift by 10 kHz. This means the actual frequency could range from 99.99 MHz to 100.01 MHz.

This calculator simplifies converting frequency stability from Hz to ppm, making it easier for engineers to assess timing precision. This is crucial in communications, navigation, and signal processing, where even minor frequency shifts can impact synchronization and performance. Understanding ppm ensures optimal oscillator selection and stable system operation.