Deutsche Version 
Fill out the gray box above and click at the calculation bar of the respective column.
Frequency means oscillations (cycles) per second in Hz = hertz = 1/s.
1 second = 1 s = 1000 ms  1 ms = 0.001 s  1 µs = 0.000001 s
cps = cycles per second
To use the calculator, simply enter a value. The calculator works in both directions of the ↔ sign. 
Oszilloscope: Input of the boxes (Div.) and timebase (Y) give the frequency.
Formula for period (cycle duration) T
Physical value  symbol  unit  abbreviation  formula 
Cycle duration  T = 1 / f  second  s  T = λ / c 
Frequency  f = 1 / T  hertz  Hz = 1/s  f = c / λ 
Wavelength  λ  meter  m  λ = c / f 
Wave speed  c  meter per second  m/s  c = λ × f 

Time conversion  As time goes by
Formulas and equations for frequency and wavelength
The formula for frequency is: f (frequency) = 1 / T (period). f = c / λ = wave speed c (m/s) / wavelength λ (m). The formula for time is: T (period) = 1 / f (frequency). The formula for wavelength is λ (m) = c / f λ = c / f = wave speed c (m/s) / frequency f (Hz). The unit hertz (Hz) was once called cps = cycles per second. 
Choose: Speed of sound in air at a temperature of 20°C: c = 343 m/s or speed of radio waves and light in a vacuum: c = 299,792,458 m/s. The propagation speed of electrical signals via optical fiber is about 9/10 the speed of light, that is ≈ 270,000 km/s. The propagation speed of electrical signals via copper cables is about 2/3 the speed of light, that is ≈ 200,000 km/s. Speed of sound c = 343 m/s also equates to 1235 km/h, 767 mph, 1125 ft/s. 
The Angular Frequency is ω = 2π × f
Given is the equation: y = 50 sin (5000 t) Determine the frequency and the amplitude. Answer: The amplitude is 50 and ω = 5000. So the frequency is f = 1/T = ω / 2 π = 795.77 Hz. 
To use the calculator, simply enter a value. The calculator works in both directions of the ↔ sign. 
Conversion: Frequency to wavelength and vice versa
In physics and electrical engineering for the sinusoidal process is often used the angular frequency ω instead of the frequency f. The speed or frequency of revolution is a size at  preferably mechanical  rotating movements indicating the frequency of revolutions. For example, it is an essential feature for engines. It will be given in 1/min, as revolutions per minute, or as in rpm. 
The y axis shows the sound pressure p (sound pressure amplitude). If the graph shows at the x axis the time t, we see the period T = 1 / f. If the graph shows at the x axis the distance d, we see the wavelength λ. The largest deflection or elongation is referred to as amplitude a. 
The amplitude has absolutely nothing to do with the frequency ... also nothing with the wavelength. 
Waves may be graphed as a function of time or distance. A single frequency
wave will appear as a sine wave (sinosoid) in either case. From the distance
graph the wavelength may be determined. From the time graph, the period
and frequency can be obtained. From both together, the wave speed can be
determined. Source: http://hyperphysics.phyastr.gsu.edu/hbase/sound/wavplt.html 
In acoustics an expression for a sine wave is written in the form y = A sin (2 π f T + φ). Where ω = 2 π f and A is the amplitude and where f is the frequency of the wave measured in hertz. Comparing the mathematical form y = A sin (B T + φ): With this acoustical form we see that  B  = 2 π f. Hence we have the frequency f =  B  / 2 π and the period T = 2 π /  B  = 1 / f. 
Overtones, partials and harmonics from fundamental frequency Keyboard, frequencies = Naming of musical notes, piano keys Frequency domain of musical instruments and voices 
SI multiples for hertz (Hz)  
Value  Symbol  Name  Value  Symbol  Name  
10^{−1} Hz  dHz  decihertz  10^{1} Hz  daHz  decahertz  
10^{−2} Hz  cHz  centihertz  10^{2} Hz  hHz  hectohertz  
10^{−3} Hz  mHz  millihertz  10^{3} Hz  kHz  kilohertz  
10^{−6} Hz  µHz  microhertz  10^{6} Hz  MHz  megahertz  
10^{−9} Hz  nHz  nanohertz  10^{9} Hz  GHz  gigahertz  
10^{−12} Hz  pHz  picohertz  10^{12} Hz  THz  terahertz  
10^{−15} Hz  fHz  femtohertz  10^{15} Hz  PHz  petahertz  
10^{−18} Hz  aHz  attohertz  10^{18} Hz  EHz  exahertz  
10^{−21} Hz  zHz  zeptohertz  10^{21} Hz  ZHz  zettahertz  
10^{−24} Hz  yHz  yoctohertz  10^{24} Hz  YHz  yottahertz  
Common prefixed units are in bold face. 
A typical question: What is the relationship between wavelength, temperature, and frequency?
Explain the relationship between distance, time, and frequency in determining
wavelength or: What is the equation with frequency, distance, and time? Speed = distance / time Speed = wavelength × frequency therefore Wavelength × frequency = distance / time therefore Wavelength = distance / (time × frequency) 
Masterclock calculator (clock rate)
To use the calculator, simply enter a value. The calculator works in both directions of the ↔ sign. 
Calculator with reference frequency
For downward tuning the reference frequency and piano tuning can be changed.
100 cent is equivalent to a semitone (halftone).
Note names: English and German System by comparison
Calculations of Harmonics from Fundamental Frequency
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