Weight units span an enormous range, from milligrams for dosages to long tons for freight, and the troy system used for precious metals adds yet another wrinkle. This converter handles all 12 units in one tool.
How to use this weight converter
- Enter a value and select your From unit.
- Select your To unit.
- Read the converted result instantly, or tap Swap Units to reverse the direction.
What this weight converter covers
This tool spans 12 weight and mass units across the metric system (milligrams to metric tons), imperial/US customary units (grains to long tons), and the troy ounce and troy pound used specifically for precious metals like gold and silver.
Why troy weight is different
Troy ounces and troy pounds, despite sharing a name with the everyday avoirdupois ounce and pound, are actually heavier: a troy ounce is about 31.1 grams versus an avoirdupois ounce’s roughly 28.35 grams. This distinction matters most when pricing precious metals, gold and silver prices are quoted per troy ounce, so converting a troy weight using the standard avoirdupois ounce definition would produce an incorrect result.
Short tons, long tons, and metric tons aren’t the same
A US short ton is 2,000 lb, an imperial (long) ton is 2,240 lb, and a metric ton (tonne) is 1,000 kg, roughly 2,204.6 lb. These three “ton” units are close enough to cause real confusion in freight, shipping, and industrial contexts, always confirm which ton definition a source is using before treating the figures as interchangeable.
Frequently asked questions
Why is a troy ounce different from a regular ounce?
A troy ounce (used for precious metals like gold and silver) is about 31.1 grams, heavier than a standard avoirdupois ounce’s roughly 28.35 grams, despite sharing the same name. Always use troy ounces when converting precious metal weights.
What’s the difference between a US ton, a long ton, and a metric ton?
A US short ton is 2,000 lb, a UK/imperial long ton is 2,240 lb, and a metric ton (tonne) is 1,000 kg (about 2,204.6 lb). All three are commonly just called “tons,” so confirm which definition applies before comparing figures.
