Energy to Frequency Converter
Switch between energy units and frequency values for photons, waves, and quantum calculations. Updates live as you type.
Quick Conversion
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Spectrum Visualization
Energy vs. frequency across electromagnetic spectrum. Current value marked in green.
Popular Examples
| Energy | Frequency | Application |
|---|---|---|
| 1.96 eV | 4.74 × 1014 Hz | Red laser |
| 2.48 eV | 5.99 × 1014 Hz | Green light |
| 0.123 eV | 2.98 × 1013 Hz | IR sensor |
| 12.4 keV | 3.00 × 1018 Hz | X-ray imaging |
| 1240 eV | 3.00 × 1017 Hz | UV light |
Conversion Formula
Core Equation: \( E = h \nu \) where \( h = 4.135667662 \times 10^{-15} \) eV·s (Planck’s constant).
Steps:
- Input energy \( E \) in selected unit (e.g., eV).
- Convert to eV if needed: J → eV (\( \div 1.602 \times 10^{-19} \)), keV → eV (\( \times 1000 \)).
- Compute \( \nu = \frac{E}{h} \) in Hz.
- Scale to output unit (e.g., THz = Hz / 1012).
For wavenumber: \( \nu = c \times \tilde{\nu} \) with \( c = 3 \times 10^{10} \) cm/s.
Common Questions
Why use eV for photon energy?
Electronvolts match atomic scales in spectroscopy and quantum mechanics.
Does this work for waves beyond light?
Yes, applies to any electromagnetic or matter wave via de Broglie relation.
How accurate is Planck’s constant here?
Uses CODATA 2018 value to 9 decimals for lab precision.
Wavenumber to frequency?
Multiplies by speed of light in cm/s for direct conversion.
Visible light range?
1.65–3.1 eV covers 400–750 nm wavelengths fully.
Reverse: frequency to energy?
Swap button handles it instantly.
Units for radio waves?
Low eV like 10-6 eV yield MHz/GHz.
Gamma rays?
MeV+ energies give PHz+ frequencies.
References
Reusch, W. Chemistry Conversion Factors. Michigan State University, https://www2.chemistry.msu.edu/faculty/reusch/virttxtjml/cnvcalc.htm (Accessed 2025).
Omni Calculator. Photon Energy Calculator, https://www.omnicalculator.com/physics/photon-energy (Accessed 2025).
HEASARC. Energy to Frequency Converter, NASA Goddard, https://heasarc.gsfc.nasa.gov/cgi-bin/Tools/energyconv/energyConv.pl (Accessed 2025).