Molar gas constant = 8.314 462 618... J·mol⁻¹·K⁻¹

Name: Molar gas constant (R) — CODATA 2022 value
Creator: NIST

Symbol: R
Value: 8.314 462 618...
Unit: J·mol⁻¹·K⁻¹
Uncertainty: exact (by definition)
Copy-ready: 8.314462618

NAk. The R in pV = nRT; exact since 2019 because both factors are exact.

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

Calculators that use R

Ideal Gas Law

Thermodynamic and chemical constants

Molar gas constant Faraday constant Stefan–Boltzmann constant Wien wavelength displacement law constant Molar volume of an ideal gas (273.15 K, 101.325 kPa)

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UsePhysics. "Molar gas constant — 8.314 462 618... J·mol⁻¹·K⁻¹." UsePhysics.com. https://usephysics.com/reference/molar-gas-constant. Value from the 2022 CODATA adjustment (NIST). Accessed [date].