`C^2 = 931.46 (MeV) / u`

931.46

The Speed of Light Squared (C²) is 931.46 mega electron volts (MeV) per atomic mass units (u).  This constant is often used in Einstein's famous E = mc² formula to convert mass into energy.  

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Mass-Energy-Light Calculators

• E = m•c² (mass/energy equivalent)
• m = E/c² (mass from energy)
• E = m•γ•c² (mass/energy equivalent not at rest)
• E = h•ν (Quantum Energy)
• p = m•γ•v (Relativistic Momentum)
• c (Speed of light) = 2.99792458E8 m/s
• c² (Speed of Light Squared) = 931.46 MeV/u
• Lorentz factor (`gamma`)
• KE ≈ m(1+v²/(2c²)-1)c² (Relativistic Kinetic Energy)