Last Updated: April 13, 2026
Wavelength & Frequency Calculator
Free wavelength and frequency calculator. Convert between wavelength, frequency, and energy for EM waves.
Wavelength
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Frequency
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Photon Energy
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Band
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📐 How We Calculate — Learn about our calculation methodology, data sources, and quality standards.
Frequently Asked Questions
What is the relationship?
c = f × λ (speed of light = frequency × wavelength). For EM waves, c ≈ 3 × 10⁸ m/s.
What is photon energy?
E = hf where h is Planck's constant. Higher frequency = higher energy.
What is visible light range?
Wavelengths from ~380nm (violet) to ~700nm (red), frequencies ~430-790 THz.