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`E = h*f`

Enter a value for all fields

The **Planck's Equation** calculator computes the energy of a photons based on their frequency (**f**) and Planck's Constant.

**INSTRUCTIONS: **Choose units and enter the following:

- (
**f**) Frequency

**Energy (E)**: The calculator returns the energy in Joules. However this can be automatically converted into other energy units via the pull-down menu.

Planck's theory asserted that energy was transferred in units known as quanta in the ratio employed in Plank's Equation. With this, one can calculate the energy of photons given their frequency. Plank's Equation is:

`E = h * f`

where:

- E is energy in Joules
- h is Planck's Constant
- f is the frequency

Note the following relations are also true:

where:

- E = energy of light
- f = frequency
- h = Planck's Constant
- c = Speed of Light in a vacuum

The formula in this calculators is derived from the above relationships.

The frequency of light (photons) ranges from approximately 1 kHz for plasma in space to 2.4 x 10^{23} Hz for gamma rays.