Weight Converter
Use this weight converter to switch between mg, g, kg, oz, lbs, stones, and metric tons instantly. Real-time results as you type.
About Weight Converter
The Weight Converter tool provides instant, real-time conversion between seven common mass and weight units - milligrams, grams, kilograms, ounces, pounds, stones, and metric tons. Just pick your units, type a number, and get an accurate result immediately.
How It Works
Select a source unit and a target unit from the dropdown menus, enter your value, and the result appears as you type. The swap button reverses the conversion direction without clearing your input, making it easy to compare values in both directions.
Precise Conversion Factors
The converter uses exact conversion factors recognized by international standards. One kilogram is defined as exactly 2.20462 pounds, one ounce as exactly 28.3495 grams, and one stone as exactly 14 pounds. Internal calculations use full floating-point precision before rounding the display, so even large values remain accurate. For a quick kg-to-lbs lookup, you can also use the dedicated kg to lbs converter.
Metric and Imperial Systems
Weight and mass units are split between the metric system used by most of the world and the imperial system used primarily in the United States, United Kingdom, and a handful of other countries. This converter bridges both systems and also includes the stone, which is still widely used in the UK for body weight. Need to convert lengths too? The length converter works the same way.
All processing occurs in your browser with no server calls. The tool loads once and works fully offline.
Frequently Asked Questions
What weight units are supported?
The converter handles milligrams (mg), grams (g), kilograms (kg), ounces (oz), pounds (lbs), stones (st), and metric tons (t). Choose any combination of source and target unit to get an instant result.
What is the difference between mass and weight?
In everyday language the two terms are used interchangeably. Scientifically, mass is the amount of matter in an object (measured in kilograms), while weight is the force exerted on that mass by gravity (measured in newtons). This converter treats the values as mass, which is the standard for all listed units.
How many pounds are in a stone?
One stone equals exactly 14 pounds. The stone is commonly used in the United Kingdom and Ireland for expressing body weight. This converter handles stone-to-pound and stone-to-kilogram conversions seamlessly.
Does the tool convert as I type?
Yes. The result updates in real time with every keystroke so you can experiment with different values without pressing a button. A swap control lets you reverse the source and target units instantly.