PPM Calculator

Oscillators and other frequency control devices specify their frequency variation in units of parts per million (ppm). Use the calculators below to convert between ppm and Hz. The equation for this relationship is,

eqn_ppm

where ppm is the peak variation (expressed as +/-), f is the center frequency (in Hz), df is the peak frequency variation (in Hz), and 106 is 1000000 (e.g. one million). Enter numbers below as integers, decimals, or use scientific notation (for example, enter 1500 as 1500, 1.5e3, or 1.5E3).

Convert ppm to Hz

Enter f (Hz)
Enter ppm (+/-)
Calculate   Reset  
Variation, +/- df (Hz)
Min Frequency (Hz)
Max Frequency (Hz)
Max - Min Period (sec)
 

For example, 100 ppm of 100 MHz represents a variation in frequency of 10 kHz. The maximum and minimum frequencies are therefore 100.01 and 99.99 MHz, respectively. The change in period between these two frequencies is 2 ps (that is, 1/99.99MHz - 1/100.01MHz).

Convert Hz to ppm

Enter f (Hz)
Enter max or min f (Hz)
Calculate   Reset  
Variation, +/- df (Hz)
ppm (+/-)
ppb (+/-) = 1000×ppm
Max - Min Period (sec)
 

For example, if a center frequency varies from 100 MHz to 100.01 MHz, this 10 kHz frequency variation represents 100 ppm.