Why weight units vary so much by region
Kilograms are the standard scientific and medical unit worldwide, but everyday usage still varies: pounds dominate casual conversation in the United States, stone is common for body weight in the UK, and grams are used for smaller quantities almost everywhere, including cooking and nutrition labels.
This converter runs every unit through kilograms as a common base, so converting directly between any two units — say, stone to pounds — stays accurate and consistent.