Weight Calculator

A simple app allows you to convert between units of weight.

Grams to Kilograms
Grams to Milligrams
Grams to Ounces
Grams to Pounds
Kilograms to Grams
Kilograms to Milligrams
Kilograms to Ounces
Kilograms to Pounds
Kilograms to Tons
Milligrams to Grams
Milligrams to Kilograms
Milligrams to Micrograms
Micrograms to Milligrams
Ounces to Grams
Ounces to Kilograms
Ounces to Pounds
Pounds to Grams
Pounds to Kilograms
Pounds to Ounces
Pounds to Stones
Pounds to Tons
Stones to Pounds
Tons to Kilograms
Tons to Pounds


In modern scientific usage, weight and mass are fundamentally different quantities: mass is an "extrinsic" (extensive) property of matter, whereas weight is a force that results from the action of gravity on matter: it measures how strongly the force of gravity pulls on that matter. However, in most practical everyday situations the word "weight" is used when, strictly, "mass" is meant.

The distinction between mass and weight is unimportant for many practical purposes because the strength of gravity does not vary too much on the surface of the Earth. In a uniform gravitational field, the gravitational force exerted on an object (its weight) is directly proportional to its mass. For example, object A weighs 10 times as much as object B, so therefore the mass of object A is 10 times greater than that of object B. This means that an object's mass can be measured indirectly by its weight, and so, for everyday purposes, weighing (using a weighing scale) is an entirely acceptable way of measuring mass. Similarly, a balance measures mass indirectly by comparing the weight of the measured item to that of an object(s) of known mass. Since the measured item and the comparison mass are in virtually the same location, so experiencing the same gravitational field, the effect of varying gravity does not affect the comparison or the resulting measurement.