Weight Converter

A weight converter changes a mass from one unit to another across the metric and imperial systems, so you do not have to memorize factors or worry about which way to multiply. This free tool covers the units that come up in everyday life and work: grams and kilograms on the metric side; ounces, pounds, and stones on the imperial side; and short (US), long (UK), and metric tons for larger quantities. Enter a value, choose the unit you have and the unit you want, and the answer appears instantly. Strictly speaking, weight and mass are different physical quantities, but in everyday use people convert what a scale reads, and those readings follow exact internationally agreed definitions. The pound is defined as exactly 0.45359237 kilograms, which makes one kilogram about 2.20462 pounds and one ounce about 28.3495 grams. A stone is exactly 14 pounds (about 6.35 kg), a figure still used for body weight in the UK and Ireland. The various tons are a common source of confusion: a US short ton is 2,000 pounds (about 907 kg), a UK long ton is 2,240 pounds (about 1,016 kg), and a metric tonne is exactly 1,000 kg. This converter keeps them distinct so you do not mix them up. Typical uses include tracking body weight across kg, pounds, and stones, scaling recipes between grams and ounces, checking luggage or shipping limits, and reading labels in an unfamiliar system. Everything runs locally in your browser, so it is fast, private, and works offline.