Math & Science
Wavelength Frequency Calculator
Convert between wavelength, frequency, and energy
Formulas and edge cases are reviewed against authoritative references before publication. For methodology, editorial standards, or corrections, use the links below.
Frequently asked questions
What is the EM spectrum?
Radio < Microwave < IR < Visible < UV < X-ray < Gamma, in order of increasing frequency/energy.
What is visible light range?
Approximately 380-700 nm wavelength, or 430-770 THz frequency.
Why use eV for energy?
Electronvolt is convenient for photon energies. 1 eV = 1.6×10⁻¹⁹ J.
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About this tool
Inputs
- Input
- Value
- Unit
- Wavelength
- Frequency
- Energy
- Radio
- Microwave
- Infrared
- Visible
- Ultraviolet
- X-ray
- Gamma
Results
- Wavelength
- Frequency
- Energy
- Radiation Type
The Wavelength Frequency Calculator is built for anyone who needs a quick, reliable answer. Enter your numbers and let the formula do the heavy lifting. Provide input, value, unit, wavelength, frequency, energy, radio, microwave, infrared, visible, ultraviolet, x-ray and gamma to get started. The tool derives wavelength, frequency, energy and other key metrics from your entries. Precision matters: rounding at intermediate steps can introduce errors that compound in multi-step calculations.
People frequently need to convert between wavelength, frequency, and energy but lack a quick way to do it — this tool fills that gap. Radio < Microwave < IR < Visible < UV < X-ray < Gamma, in order of increasing frequency/energy. When in doubt, estimate the answer first so you have a sanity check for the exact result. Run the calculation with your best- case and worst-case assumptions to bracket the likely outcome. The result follows directly from the formula — no approximations or shortcuts are involved. Many practical problems — from engineering to daily budgets — reduce to straightforward arithmetic once you identify the right formula.