In order to calculate wavelength, you first want to determine the speed of light in meters per seconds, which is 299,792,458 m/s. Then you want to find out what the frequency of the
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1. Find out the frequency of the wave you are trying to measure. Whether you're dealing with microwaves or light rays, frequency is often indicated in hertz, megahertz or kilohertz.
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1 Know the formula for calculating wavelength. To find the wavelength of a wave, you just have to divide the wave's speed by its frequency. The formula for calculating wavelength
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frequency = Speed of light/ wavelength.
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