Weight Converter
Convert between milligrams, grams, kilograms, tonnes, ounces and pounds instantly — free and private.
From weighing ingredients in the kitchen to calculating shipping freight, this weight converter handles metric and imperial mass units with laboratory-grade factors. It uses the exact avoirdupois definitions, so a pound is always 0.45359237 kilograms. Enter a value once and watch the precise result update live as you type.
Uses exact avoirdupois definitions (1 lb = 0.45359237 kg).
How to use the Weight Converter
- Type the weight you want to convert in the value box.
- Pick the starting unit in the From list and the target unit in the To list.
- The converted result appears instantly below — change any field to recalculate.
Weight Converter — FAQs
How accurate is this weight converter?
It uses the exact international avoirdupois definitions: 1 pound equals 0.45359237 kilograms and 1 ounce equals 28.349523125 grams. Results are computed with full floating-point precision and rounded only for display, making it reliable for cooking, postage, fitness tracking and schoolwork.
Can I convert pounds to kilograms and vice versa?
Yes. Choose pound as the From unit and kilogram as the To unit, or the other way around. The conversion is instant and exact, so 150 pounds becomes 68.0389 kilograms. It is ideal for gym logs, recipes from abroad and international shipping quotes.
What is the difference between a tonne and a ton?
This tool uses the metric tonne, which equals exactly 1,000 kilograms. The US short ton is 907.1847 kilograms and the UK long ton is 1,016.0469 kilograms. For freight and vehicle specifications, always confirm which ton your document means before converting.
Is my data uploaded anywhere?
Your data never leaves your device. This converter runs entirely in your browser using JavaScript, so nothing is uploaded, stored, shared or tracked. It works offline too, and you can use it as often as you like with complete confidence.