Speed of Light Calculator
Free calculate speed of light in vacuum, air, water, and other media. convert light speed between units and calculate using refractive index.
Input Parameters
Results
Select medium to calculate speed of light
Speed of Light Formula
Formula
v = c / n
Where:
- • v = speed in medium (m/s)
- • c = speed in vacuum (299,792,458 m/s)
- • n = refractive index
Common Values
- • Vacuum: 299,792,458 m/s
- • Air: ~299,700,000 m/s
- • Water: ~225,000,000 m/s
- • Glass: ~200,000,000 m/s
- • Diamond: ~124,000,000 m/s