SI Derived Units

Name: SI Derived Units
Creator: staticdata.dev
License: https://opensource.org/licenses/MIT

A complete reference of the 22 coherent SI derived units that carry special names and symbols, as defined by the Bureau International des Poids et Mesures (BIPM) in the 9th edition of the SI Brochure (2019). Each record includes the unit name, symbol, the physical quantity it measures, and its expression in terms of SI base units (metre, kilogram, second, ampere, kelvin, mole, candela). Covers mechanical, electromagnetic, photometric, and radiological quantities from the hertz and newton through to the katal.

v1.0.0 MIT 22 records Updated 2026-10-05 stable Source: BIPM SI Brochure, 9th edition (2019)

Quick fetch

Stable URL. CORS-enabled. No auth.

bash

curl https://staticdata.dev/v1/si-derived-units.json

Or use as a typed import: import { siDerivedUnits } from "https://staticdata.dev/v1/si-derived-units.ts"

Formats

JSON 2.7 KB

/v1/si-derived-units.json

Open

min: 2.0 KB · /v1/si-derived-units.min.json
CSV 1.0 KB

/v1/si-derived-units.csv

Open
TypeScript 2.9 KB

/v1/si-derived-units.ts

export const siDerivedUnits

type SiDerivedUnit = (typeof siDerivedUnits)[number]

Open

Schema

Each record in the dataset has the following shape.

Schema
Field	Type	Description	Example
name	string	Full name of the derived unit	newton
symbol	string	Official SI symbol for the unit	N
quantity	string	Physical quantity or quantities measured	force
expression	string	Expression in SI base units	kg·m·s⁻²

Preview

First 10 records.

Data preview
name	symbol	quantity	expression
hertz	Hz	frequency	s⁻¹
radian	rad	plane angle	m/m
steradian	sr	solid angle	m²/m²
newton	N	force	kg·m·s⁻²
pascal	Pa	pressure, stress	kg·m⁻¹·s⁻²
joule	J	energy, work, heat	kg·m²·s⁻²
watt	W	power, radiant flux	kg·m²·s⁻³
coulomb	C	electric charge	A·s
volt	V	electric potential, voltage, emf	kg·m²·s⁻³·A⁻¹
farad	F	capacitance	kg⁻¹·m⁻²·s⁴·A²

Showing 10 of 22. View full data: JSON · CSV

Fetch examples

Drop-in snippets in five languages.

curl

curl -sSL https://staticdata.dev/v1/si-derived-units.json | jq '.[0]'

JavaScript

import type { SiDerivedUnit } from "https://staticdata.dev/v1/si-derived-units.ts";

const res = await fetch("https://staticdata.dev/v1/si-derived-units.min.json");
if (!res.ok) throw new Error(`Fetch failed: ${res.status}`);
const siDerivedUnits: SiDerivedUnit[] = await res.json();
console.log(siDerivedUnits[0]);

Python

import urllib.request, json

with urllib.request.urlopen("https://staticdata.dev/v1/si-derived-units.min.json") as r:
    siDerivedUnits = json.load(r)

print(siDerivedUnits[0])

package main

import (
	"encoding/json"
	"fmt"
	"net/http"
)

func main() {
	resp, err := http.Get("https://staticdata.dev/v1/si-derived-units.min.json")
	if err != nil { panic(err) }
	defer resp.Body.Close()

	var data []map[string]any
	if err := json.NewDecoder(resp.Body).Decode(&data); err != nil {
		panic(err)
	}
	fmt.Println(data[0])
}

Rust

use serde_json::Value;

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let body = ureq::get("https://staticdata.dev/v1/si-derived-units.min.json").call()?.into_string()?;
    let data: Vec<Value> = serde_json::from_str(&body)?;
    println!("{:?}", data.first());
    Ok(())
}

Sources and methodology

The International System of Units (SI) defines seven base units and a larger set of derived units formed by combining them. Among these, 22 derived units have been given special names and symbols by the General Conference on Weights and Measures (CGPM). This dataset enumerates all 22, as specified in Table 4 of the 9th edition of the SI Brochure published by the Bureau International des Poids et Mesures (BIPM) in 2019.

Each record provides the unit’s name, its official symbol (using Unicode superscripts for exponents and the middle dot for multiplication), the physical quantity or quantities it represents, and its expression in terms of the seven SI base units. Where a derived unit is dimensionless (radian, steradian) the expression reflects the cancellation of identical base-unit dimensions. The degree Celsius is listed with an expression of K because its magnitude equals one kelvin; it differs only in offset.

This dataset is suitable for unit-conversion libraries, physics simulations, scientific documentation tools, and educational applications. The data is stable — the 22 named derived units have not changed since the 2019 SI revision — but consumers should note that the BIPM may add new named units in future CGPM resolutions.

Versioning

URLs under /v1/ are stable: field names and types will not change in a way that breaks consumers. Values can be corrected or records added when the upstream source changes; schema-incompatible updates ship under a new version path. See the si-derived-units changelog for this dataset's history.