Natural unit of momentum = 2.730 924 534 46 × 10⁻²² kg·m·s⁻¹

Name: Natural unit of momentum — CODATA 2022 value
Creator: NIST

Value: 2.730 924 534 46 × 10⁻²²
Unit: kg·m·s⁻¹
Uncertainty: 0.000 000 000 85 × 10⁻²²
Copy-ready: 2.73092453446e-22

The natural unit of momentum in the system where ℏ, c and the electron mass equal 1.

Used in relativistic quantum mechanics; multiply a result in natural units by this value to get the momentum in SI.

The same quantity, other ways NIST lists it

Quantity (NIST name)	Value	Unit	Uncertainty
Natural unit of momentum in MeV/c	0.510 998 950 69	MeV/c	0.000 000 000 16

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

Natural units and Planck units

Planck length Planck mass Planck temperature Planck time Natural unit of momentum Natural unit of time

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UsePhysics. "Natural unit of momentum — 2.730 924 534 46 × 10−22 kg·m·s⁻¹." UsePhysics.com. https://usephysics.com/reference/natural-unit-of-momentum. Value from the 2022 CODATA adjustment (NIST). Accessed [date].