Last updated: April 2026
The Weight Converter transforms measurements between 7 commonly used weight and mass units: milligrams, grams, kilograms, metric tons, ounces, pounds, and stones. Pick your starting unit, type a value, and see every other unit calculated instantly. This is the tool you reach for when converting recipe ingredients between grams and ounces, tracking your weight in kilograms versus pounds for fitness apps, calculating shipping weights for international packages, or doing chemistry homework with metric mass units. The main conversion result is highlighted at the top, and below it a full table shows all other unit conversions simultaneously. Each result has a dedicated copy button. The converter uses precise conversion factors and supports both very large and very small values.
Choose the weight unit you are converting from using the From dropdown. Options include milligrams, grams, kilograms, metric tons, ounces, pounds, and stones.
Type the value you want to convert. The tool accepts decimals and handles both tiny values (like milligrams for supplements) and large values (like metric tons for shipping).
Choose the unit to convert to using the To dropdown. The converted result appears highlighted in the box to the right of your input.
Below the main result, a grid displays your weight in every other available unit. Each conversion has its own copy button.
Weight Converter is the fastest way to convert between weight units online. Key advantages include 7 unit options, complete conversion tables, wide range support, and one-click copy.
One kilogram equals approximately 2.20462 pounds. One pound equals approximately 0.453592 kilograms. A quick mental shortcut for rough estimates: multiply kilograms by 2.2 to get pounds, or divide pounds by 2.2 to get kilograms.
One ounce equals approximately 28.3495 grams. This conversion comes up constantly in cooking when following recipes from different countries. American recipes typically use ounces and cups, while European and Asian recipes use grams. Having this converter handy in the kitchen saves time and improves accuracy.
A stone is a unit of weight equal to 14 pounds or approximately 6.35 kilograms. It is commonly used in the United Kingdom and Ireland for measuring body weight. When someone in the UK says they weigh '11 stone', that means 154 pounds or about 70 kilograms.
Mass measures the amount of matter in an object and is constant regardless of location (measured in kilograms). Weight is the force of gravity on that mass and changes with gravitational pull (measured in newtons). On Earth's surface, we use weight and mass interchangeably in everyday language. A person with 70 kg of mass weighs about 686 newtons on Earth but only 113 newtons on the Moon.
Yes. This converter handles milligrams and shows results in scientific notation for very small conversions. For example, 500 milligrams converts to 0.5 grams, 0.0005 kilograms, 0.017637 ounces, and so on. This is useful for pharmaceutical dosages, supplement measurements, and laboratory work.