Standard acceleration of gravity = 9.806 65 m·s⁻²

Name: Standard acceleration of gravity (gn) — CODATA 2022 value
Creator: NIST

Symbol: gn
Value: 9.806 65
Unit: m·s⁻²
Uncertainty: exact (by definition)
Copy-ready: 9.80665

A conventional agreed value, not a measurement: real surface gravity runs from about 9.78 m·s⁻² at the equator to about 9.83 m·s⁻² at the poles.

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

Calculators that use gn

Newton's Second Law Acceleration Projectile Motion Free Fall Free Fall From Time Terminal Velocity Tension Atwood Machine Incline Tension Two-Rope Tension Impact Force Horizontal Projectile Potential Energy

Universal constants

Reduced Planck constant Newtonian constant of gravitation Standard acceleration of gravity Vacuum electric permittivity Vacuum magnetic permeability Characteristic impedance of vacuum

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UsePhysics. "Standard acceleration of gravity — 9.806 65 m·s⁻²." UsePhysics.com. https://usephysics.com/reference/standard-gravity. Value from the 2022 CODATA adjustment (NIST). Accessed [date].