Triton mass = 5.007 356 7512 × 10⁻²⁷ kg

Name: Triton mass — CODATA 2022 value
Creator: NIST

Value: 5.007 356 7512 × 10⁻²⁷
Unit: kg
Uncertainty: 0.000 000 0016 × 10⁻²⁷
Copy-ready: 5.0073567512e-27

Rest mass of the triton — the nucleus of tritium, one proton and two neutrons.

Used to compute reaction energies, decay kinematics and binding energies. The lines below give the same mass in kilograms, atomic mass units (u), as an energy (mc², in J and MeV) and per mole, plus its ratio to other particles — all from the same CODATA adjustment, so they agree with each other.

The same quantity, other ways NIST lists it

Quantity (NIST name)	Value	Unit	Uncertainty
Triton-electron mass ratio	5496.921 535 51	(dimensionless)	0.000 000 21
Triton mass energy equivalent	4.500 387 8119 × 10⁻¹⁰	J	0.000 000 0014 × 10⁻¹⁰
Triton mass energy equivalent in MeV	2808.921 136 68	MeV	0.000 000 88
Triton mass in u	3.015 500 715 97	u	0.000 000 000 10
Triton molar mass	3.015 500 719 13 × 10⁻³	kg·mol⁻¹	0.000 000 000 94 × 10⁻³
Triton-proton mass ratio	2.993 717 034 03	(dimensionless)	0.000 000 000 10
Triton relative atomic mass	3.015 500 715 97	(dimensionless)	0.000 000 000 10

NIST, Fundamental Physical Constants — Complete Listing (2022 CODATA adjustment), retrieved 2026-07-26.

Particle masses

Alpha particle mass Deuteron mass Helion mass Muon mass Tau mass Triton mass

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