Weight Converter

Convert between weight and mass units — ounces, pounds, stone, kilograms, grams, and tons.

Grams are the internal pivot. Your entry is scaled into grams using its own unit's factor — 28.3495 for the avoirdupois ounce, 453.592 for the pound, 6350.29 for the stone, 907,185 for the US ton and a flat million for the metric tonne — and then divided back out across seven columns. The input list and the output table are deliberately not symmetrical: US Tons appears among the units you can enter but has no column of its own, so a tonnage figure comes back expressed in metric tonnes and kilograms rather than in the short ton you started from. Watch which unit the answer you need actually lives in. The default entry of 150 pounds lands on 68.0388 kilograms and 10.7143 stone, that last one being the reason the column exists at all — British and Irish body weight is quoted nowhere else. Precious metals are the main trap. The ounce here is the avoirdupois grocery ounce, not the troy ounce used for gold and silver, and no troy unit or pennyweight is offered. There is also no gravity anywhere in the arithmetic, so nothing yields newtons or pounds-force; every figure describes quantity of matter, unchanged by where you weigh it.