Kilogram
Embed This Widget
Add the script tag and a data attribute to embed this widget.
Embed via iframe for maximum compatibility.
<iframe src="https://unitfyi.com/iframe/glossary/kilogram/" width="420" height="400" frameborder="0" style="border:0;border-radius:10px;max-width:100%" loading="lazy"></iframe>Paste this URL in WordPress, Medium, or any oEmbed-compatible platform.
https://unitfyi.com/glossary/kilogram/Add a dynamic SVG badge to your README or docs.
[](https://unitfyi.com/glossary/kilogram/)Use the native HTML custom element.
Definition
The SI base unit of mass, defined by the Planck constant.
Explanation
Until 2019, the kilogram was defined by a physical artifact — the International Prototype of the Kilogram (IPK) stored in Paris. It is now defined through the Planck constant.
RELATED CONVERSIONS
RELATED ARTICLES
From milligrams to metric tons, this guide covers every major weight and mass unit with exact conversion factors, real-world examples, and a clear explanation of why weight and mass are not the same thing.
Temperature Scales Explained: Celsius, Fahrenheit, and KelvinA complete guide to the four temperature scales in scientific and everyday use—Celsius, Fahrenheit, Kelvin, and Rankine—including their history, conversion formulas, and where they intersect.
Power Units Guide: Watts, Horsepower, and BTU/HourPower is the rate of energy transfer — how fast work is done. This guide covers watts, kilowatts, megawatts, horsepower, and BTU/hour with real-world context from light bulbs to power plants.
RELATED TERMS
Meter
The SI base unit of length, defined as the distance light travels in 1/299,792,458 of a second.
Second
The SI base unit of time, defined by the cesium-133 atom.
Kelvin
The SI base unit of temperature, starting at absolute zero.
Ampere
The SI base unit of electric current.
International System of Units (SI)
The modern metric system of measurement, accepted worldwide for scientific and commercial use.