Multiply kilograms by 2.20462 to get pounds. For example, 70 kg equals approximately 154.3 lbs. To go the other way, divide pounds by 2.20462 (or multiply by 0.453592) to get kilograms.

A stone is a unit of weight equal to 14 pounds (approximately 6.35 kg), used primarily in the United Kingdom and Ireland for describing body weight. It is not part of the SI system, so scientific and medical contexts worldwide use kilograms instead.

Mass measures the amount of matter in an object (in kilograms or pounds-mass) and does not change with gravity. Weight is the gravitational force on that mass and varies slightly with location on Earth. In everyday use the terms are used interchangeably, but in physics they are distinct.

One avoirdupois ounce equals exactly 28.3495 grams. There are 16 ounces in one pound and 453.592 grams in one pound. The troy ounce used for precious metals is heavier at 31.1035 grams.

Metric units (grams, kilograms, tonnes) are used in science, medicine, and most countries worldwide, offering a simple base-10 system. Imperial units (ounces, pounds, stones, tons) remain common in everyday life in the US, UK, and a few other countries. For global communication and precision, metric is preferred.