Weight Converter
Convert between metric and imperial weight units instantly — milligrams, grams, kilograms, metric tons, ounces, pounds, stones, and US tons.
About Weight Converter
Our free Weight Converter makes it easy to convert between metric and imperial weight units. Whether you're following a recipe from another country, calculating shipping weights, tracking fitness goals, or working on a science project, this tool provides instant and accurate conversions.
The converter supports all common weight units: milligrams (mg), grams (g), kilograms (kg), and metric tons (t) in the metric system, plus ounces (oz), pounds (lb), stones (st), and US tons (short tons) in the imperial system. Enter your value, select the source and target units, and get your result immediately.
The conversion factors are based on internationally accepted standards: 1 pound = 0.45359237 kg exactly, 1 ounce = 28.349523125 g, 1 stone = 14 pounds = 6.35029318 kg, and 1 US short ton = 2000 pounds = 907.18474 kg. All calculations are performed in your browser for instant results.
Frequently Asked Questions
Q How many grams are in a pound?
There are approximately 453.592 grams in one pound. The exact conversion factor is 1 pound = 453.59237 grams, as defined by the international yard and pound agreement of 1959. To convert pounds to grams, multiply by 453.592. To convert grams to pounds, divide by 453.592.
Q What is the difference between a metric ton and a US ton?
A metric ton (tonne) equals 1,000 kilograms or approximately 2,204.62 pounds. A US ton (short ton) equals 2,000 pounds or approximately 907.185 kilograms. There's also a British long ton which equals 2,240 pounds or approximately 1,016.047 kilograms. The metric ton is the most widely used internationally.
Q What is a stone and where is it used?
A stone is a unit of weight equal to 14 pounds or approximately 6.35 kilograms. It's primarily used in the United Kingdom and Ireland for expressing body weight — for example, a person might say they weigh "11 stone 4 pounds" (158 pounds). The stone is not commonly used in the United States or in metric countries.