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Convert Frequency and Number per Time
Examples: a heart beats 75 times in one minute. It then has a frequency of 1.25 Hertz.
Alternating current has a frequency of 50 Hertz. So it changes its polarity 2000 times in 40 seconds.
Hz = hertz, kHz = kilohertz, MHz = megahertz, s = seconds, min = minutes, h = hours
1 Hz = 1/s = 60/min = 3600/h
1kHz = 1000 Hz, 1 MHz = 1000 kHz = 1000000 Hz
Physics commonly uses SI units. Here is a calculator to convert units.