radian (rad)

Document v1 · published by Koskamo · updated 2026-10-05

The radian (symbol rad) is a named SI derived unit of plane angle, per the BIPM SI Reference Point.

Name: radian
Symbol: rad
Unit type: Named SI derived unit
Quantity kind: plane angle
Expressed in base SI units: m m⁻¹
Defining resolution: https://si-digital-framework.org/bodies/CGPM#CGPM11-Res12
SI prefix restriction: false

Source and provenance

Original source: si-digital-framework.org
Published on Koskamo by: Koskamo
Citation version: Document v1
Reuse: BIPM SI Reference Point (si-digital-framework.org), the SI defining constants, base and derived units, and prefixes; CC BY 3.0 IGO

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Version history

Published by Koskamo2026-10-05
Version 1