Photon Energy Table: Photon energy by Wavelength
Reference table of photon energy for Photon Energy across a range of wavelength values — exact, engine-computed figures you can read off at a glance.
Photon Energy Calculator
Verified formula Updated Jun 2026 Private — runs on your device
Verified formula
Private
Photon energy
2.4797
- Energy (×10⁻¹⁹ J)
- 3.9730
For general information only — not financial, tax, legal or medical advice. Verify before you rely on it.
How to use the Photon Energy Calculator
The Photon Energy Calculator works out your photon energy, along with 1 related figure in an instant. Enter wavelength and the result updates as you type — it is free, needs no sign-up, and runs entirely in your browser so your figures stay private.
- Enter the wavelength.
- Read off your photon energy, together with energy (×10⁻¹⁹ j) — the calculator updates automatically, with no button to press.
Formula
The Photon Energy Calculator uses the formula:
Photon energy = 6.62607015e-34 × 2.998e8 ÷ (Wavelength × 1e-9) ÷ 1.602176634e-19
Worked example
For example, with wavelength of 500 nm, the photon energy is 2.4797.
| Wavelength | 500 nm |
|---|
| Photon energy | 2.4797 |
|---|---|
| Energy (×10⁻¹⁹ J) | 3.9730 |
Results are estimates for educational use, not professional advice.
Frequently asked questions
Energy = Planck's constant × speed of light ÷ wavelength. A 500 nm green photon carries about 2.48 eV.
Photon energies are tiny in joules, so electronvolts give more readable numbers for light and atomic physics.
Yes. Energy is inversely proportional to wavelength, so blue and ultraviolet light carry more energy than red.
Enter the wavelength in nanometres. Visible light runs from roughly 380 nm (violet) to 750 nm (red).
Enter the wavelength. Read off your photon energy, together with energy (×10⁻¹⁹ j) — the calculator updates automatically, with no button to press.
Related guides
How to Calculate Photon Energy: Formula, Steps & Examples
Learn how to calculate Photon Energy — the formula explained step by step, with worked examples and a free calculator to check your answer.