Deuteron mass = 3.343 583 7768 × 10⁻²⁷ kg

Name: Deuteron mass — CODATA 2022 value
Creator: NIST

Value: 3.343 583 7768 × 10⁻²⁷
Unit: kg
Uncertainty: 0.000 000 0010 × 10⁻²⁷
Copy-ready: 3.3435837768e-27

Rest mass of the deuteron — the nucleus of deuterium (heavy hydrogen), one proton bound to one neutron.

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
Deuteron-electron mass ratio	3670.482 967 655	(dimensionless)	0.000 000 063
Deuteron mass energy equivalent	3.005 063 234 91 × 10⁻¹⁰	J	0.000 000 000 94 × 10⁻¹⁰
Deuteron mass energy equivalent in MeV	1875.612 945 00	MeV	0.000 000 58
Deuteron mass in u	2.013 553 212 544	u	0.000 000 000 015
Deuteron molar mass	2.013 553 214 66 × 10⁻³	kg·mol⁻¹	0.000 000 000 63 × 10⁻³
Deuteron-proton mass ratio	1.999 007 501 2699	(dimensionless)	0.000 000 000 0084
Deuteron relative atomic mass	2.013 553 212 544	(dimensionless)	0.000 000 000 015

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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