Proton mass
Try it yourself:
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protonMass
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protonMass is the rest mass of a proton, commonly used in atomic, nuclear, and particle calculations. It is close to, but not equal to, the neutronMass and far larger than the electronMass.
Use it in SI mass calculations or convert through speedOfLight for rest energy. Atomic mass includes binding effects, so do not replace it blindly with atomicMass.
Enter protonMass on a calculator line to see its built-in value, or place the name inside a longer expression. Keep any displayed unit attached when converting or combining physical quantities, and check that every other value uses a compatible dimension.
The example above is editable, so you can replace surrounding values and test the constant in your own formula. Browse all constants to compare related values and notation.