How to use the photon energy calculator
Compute photon energy from wavelength or frequency. Enter frequency in the field above; the photon energy, photon energy, wavelength are computed instantly and plotted on the chart so you can see how the answer changes.
Formula
Variables
- f — Frequency (THz)
Worked example
With frequency = 600 THz, the calculator gives photon energy ≈ 2.481401 eV; photon energy ≈ 3.9756 × 10⁻¹⁹ J; wavelength ≈ 499.6541 nm.
Frequently asked questions
What is the formula for the photon energy calculation?
Photon energy (eV) = HPLANCK × f × 1e12 / QE. Photon energy (J) = HPLANCK × f × 1e12. Wavelength (nm) = CLIGHT / (f × 1e12) × 1e9. Here f is frequency (THz).
What inputs do I need for the photon energy calculator?
You need frequency in THz. Each field is pre-filled with a typical example so you can see how the result responds as you edit the numbers.
How do I use this calculator?
Type values into the input fields. Results and the chart update instantly. Use Reset to restore the example values, Copy results to paste them elsewhere, or Share to copy a link that preserves your inputs.
Is the result exact?
Calculations use standard formulas and double-precision arithmetic, then display about seven significant figures. Real-world measurements carry uncertainty, so treat results as estimates unless your inputs are exact.