The PPM/PPB to Hz calculator allows you to convert frequency stability expressed in parts per million (PPM) or parts per billion (PPB) into real frequency variation in Hertz.
This tool is useful for RF engineers, technicians and electronic circuit enthusiasts who want to check the accuracy and stability of oscillators.
Formula used
Δf (Hz) = f × (stability / 10⁶)
Or :
f = oscillator frequency (Hz)
stability = frequency stability in PPM or PPB (1 PPB = 0.001 PPM)
Δf = frequency variation in Hertz
Explanation
This formula shows that the actual frequency variation is proportional to the oscillator frequency and its stability.
If stability is given in PPB, it is converted to PPM before calculation.
A higher value of PPM or frequency increases the variation Δf.
Calculation example
For a 10 MHz oscillator with 5 PPM stability:
Δf = 10,000,000 × (5 / 1,000,000) = 50 Hz
Minimum frequency = 10,000,000 − 50 = 9,999,950 Hz
Maximum frequency = 10,000,000 + 50 = 10,000,050 Hz
Benefits and Use
- Allows you to quickly calculate the frequency variation of an oscillator from its stability.
- Useful for designing and testing RF and microwave circuits.
- Helps predict tolerance margins in frequency-sensitive systems.
- Facilitates the evaluation of oscillator performance and comparison between components.
