Weight Converter: Kg, Pounds, Ounces & Stone
Convert between kilograms, grams, pounds, ounces, stone, tonnes, and US/UK tons, instantly and precisely, right in your browser.
How This Weight Converter Works
Weight and mass are measured in two parallel systems that rarely line up in round numbers: the metric system, based on kilograms and grams and used by nearly every country and every scientific field, and the imperial/US customary system, based on pounds, ounces, and stone, still common in the US and UK for everyday measurements like body weight, food packaging, and shipping.
This tool converts between both systems using precise, standard conversion factors, including larger units like the metric tonne (1,000 kg) and the US short ton and UK long ton, which differ from each other by about 12%, a common source of confusion in international shipping and freight documentation.
Enter a value, choose your source and target units, and see the result instantly alongside a full table showing that same weight expressed in every supported unit at once, useful for checking a recipe’s gram measurement against ounces, converting body weight between kg and lbs, or reconciling shipping weights across different regional standards.
What this tool does
How to use it
Enter your weight value
Type the number you want to convert.
Choose the from and to units
Select the unit your value is currently in, and the unit you want to convert it to.
Read the result
The converted value appears instantly, along with a full table across every supported unit.
Swap if needed
Use the swap button to quickly reverse the conversion direction.
FAQ: Weight Converter
Multiply the kilogram value by 2.20462 to get pounds (or divide by 0.45359237, the more precise factor this tool uses). For example, 70 kg equals approximately 154.3 lbs. This is one of the most common conversions for body weight, since many countries use kg while the US commonly uses lbs.
A stone is a traditional British unit of weight equal to exactly 14 pounds, still commonly used in the UK and Ireland for expressing body weight (for example, ’11 stone 4′ means 11 stone plus 4 additional pounds). One stone equals approximately 6.35 kg.
A US ton (short ton) equals 2,000 pounds (about 907.18 kg), while a UK ton (long ton) equals 2,240 pounds (about 1,016.05 kg), roughly 12% heavier. This distinction matters in international shipping, freight, and bulk commodity trading, where using the wrong ton definition can cause significant billing or weight-limit errors.
One ounce equals approximately 28.35 grams. This conversion is especially common in cooking and baking recipes, where US recipes often use ounces or cups while metric recipes specify grams, and precise baking in particular benefits from exact gram measurements rather than approximate volume units.
In everyday language and in this tool, weight and mass are used interchangeably, since on Earth’s surface they’re proportional and convert using the same standard factors. Technically, mass measures the amount of matter in an object (constant everywhere) while weight measures the force of gravity acting on that mass (which would differ on the Moon or in orbit), but standard units like kilograms and pounds are used for both in nearly all practical, non-scientific contexts.
The factors used here are the internationally defined exact conversion constants, 1 pound equals exactly 0.45359237 kg by international agreement, and every other imperial unit in this tool derives from that same exact pound definition, so results are accurate to full floating-point precision, not rounded estimates.