Wavelength & Frequency Calculator
Convert between wavelength and frequency of light (c = fλ). This free online science & engineering calculator runs entirely in your browser — no signup, no data sent anywhere.
Inputs
Results
How It Works (Formula & Method)
For electromagnetic waves, speed = frequency × wavelength, with c ≈ 2.998×10⁸ m/s in a vacuum. So frequency = c ÷ wavelength and vice-versa. Photon energy is E = h·f, using Planck's constant h = 6.626×10⁻³⁴ J·s, shown here in electronvolts.
Worked Example
Below is a worked example using the calculator's default values. The same numbers are pre-filled in the form above so you can press Calculate and see the result without typing anything.
Inputs used:
- Value: 500
- Input Type: wavelength_nm
With these inputs, the calculator computes the metrics shown in the Results panel. Change any value and press Calculate again to see how the result responds — the live widget and the chart both update instantly.
Frequently Asked Questions
What does the Wavelength & Frequency Calculator compute?
The Wavelength & Frequency Calculator takes 2 input values and returns 3 results. Convert between the wavelength and frequency of electromagnetic radiation using c = fλ, and get the photon energy.
Is my data sent to a server?
No. The Wavelength & Frequency Calculator runs entirely in your browser using static JavaScript. Your inputs are never transmitted to CalculatorHive or any third party, and nothing is stored after you close the page.
Is this calculator free to use?
Yes. Every calculator on CalculatorHive is completely free. There is no signup, no paywall, and no usage limit. The site is supported by display advertising and affiliate partnerships, which are clearly labeled.
How accurate is the result?
The math is mathematically exact for the inputs you provide. Real-world accuracy depends on how accurately your inputs reflect the real situation — defaults are typical values, not guarantees.