Weight Converter

About 2.20462. The exact relationship runs the other way: a pound is exactly 0.45359237 kilograms, defined in 1959.

A US or short ton is 2,000 pounds; an imperial or long ton is 2,240. That is a 12% difference, and it catches shipping and freight calculations constantly.

Exactly 14. The stone is used for body weight in Britain and Ireland and almost nowhere else, which is why it appears on some scales and not others.

Exactly 1,000 kilograms, about 2,205 pounds. It sits between the US short ton and the imperial long ton, which is a further reason to state which ton is meant.

Strictly no — mass is the amount of matter and weight is the force gravity exerts on it. A bathroom scale measures force and reports mass, which works because gravity is nearly constant on Earth.

Sixteen avoirdupois ounces, which is the ordinary kind. Troy ounces, used for precious metals, are heavier and there are twelve to a troy pound — a genuinely different system.

In 2019, in terms of the Planck constant rather than a physical prototype. The platinum-iridium cylinder in Paris had been drifting relative to its copies, which is a poor property for a standard.

A unit for precious metals, about 31.1 grams against the ordinary avoirdupois ounce's 28.35. There are twelve to a troy pound, which makes it a genuinely separate system.

For gemstones, exactly 200 milligrams. For gold purity, karat is a different thing entirely — parts per twenty-four of pure gold — and the two are constantly confused.

One kilogram, near enough, at 4 °C. The relationship was the original definition of the kilogram and survives as a very close approximation.

112 pounds imperial and 100 pounds US, which is exactly the kind of divergence that makes the ton ambiguous too. Both are largely obsolete outside agriculture.

American recipes use volume, most others use weight. Weight is more accurate for dry ingredients, which is why professional baking uses it regardless of country.