Real-time bidirectional conversion between light speed, frequency, and wavelength. Free online tool for physics, engineering, and education.
Constant: 299,792,458 m/s in vacuum
This free online Light Speed Calculator provides instant conversions between the speed of light, frequency, and wavelength. Designed for students, educators, engineers, and physics enthusiasts, it performs real-time bidirectional calculations using the fundamental equation:
c = f × λ
Where: c = speed of light, f = frequency, λ = wavelength
Understanding the relationship between light speed, frequency, and wavelength is fundamental to many scientific and engineering disciplines. This tool helps with:
The speed of light in a vacuum is a fundamental physical constant denoted as 'c', approximately 299,792,458 meters per second. This is the fastest speed at which energy, matter, and information can travel through space.
Frequency (f) can be calculated from wavelength (λ) using the formula: f = c / λ, where c is the speed of light. For example, a wavelength of 500 nm (5 × 10⁻⁷ m) corresponds to a frequency of approximately 5.996 × 10¹⁴ Hz.
The calculator supports multiple units for convenience:
This calculator uses the fundamental relationship between light speed, frequency, and wavelength, which applies to all electromagnetic radiation (radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, gamma rays). The calculations assume propagation in a vacuum. For other media, the speed of light is slower, which would affect the calculations.
Yes! This calculator is fully responsive and works on all devices including smartphones, tablets, laptops, and desktop computers. The interface is touch-friendly and optimized for all screen sizes.