MMA fighters sometimes lose 10+ kg between weigh-in and competition through dehydration — competing at weights 10–15% above their weight class. Here's how combat sport weight classes work, the physiology and risks of extreme weight cutting, regulatory responses, and how powerlifting handles weight classes differently.
A troy ounce (31.1g) is 9.7% heavier than an everyday ounce (28.35g) — and all precious metal pricing uses the troy system. Here's how gold prices work per gram and per tola, the three weight systems compared, and why karat means two completely different things.
Learn weight unit conversions including the troy ounce vs regular ounce difference, the UK stone unit, US vs UK vs metric tonnes, and how to convert body weight, luggage limits, and precious metals accurately.
Learn how weight units from milligrams to maunds relate to each other — including troy ounces, tolas, and stones — with real examples for gold, cooking, shipping, and body weight.
