Weight Converter
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Stones & Pounds
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Understanding Weight and Mass Units
Weight measurement is essential in cooking, shipping, science, medicine, and countless daily activities. The metric system uses milligrams, grams, kilograms, and metric tons, with each unit differing by a factor of 1,000. The kilogram is the SI base unit of mass, originally defined by a physical platinum-iridium cylinder kept in France, and now defined by the Planck constant since 2019.
The imperial and US customary systems use ounces, pounds, and tons. One pound equals exactly 0.45359237 kilograms by international agreement. There are 16 ounces in a pound and 2,000 pounds in a US (short) ton. The stone, equal to 14 pounds, remains popular in the UK and Ireland for stating personal body weight. This converter displays stones in the traditional format of X stone Y pounds for convenience.
When working with weight conversions, be aware that a metric ton (1,000 kg) is approximately 10% heavier than a US short ton (907.185 kg). There is also a long ton (2,240 lbs), historically used in British shipping but now largely obsolete. This converter covers the eight most commonly needed weight units, converting any input value to all other units simultaneously for quick comparison and reference.
Frequently Asked Questions
How many pounds are in a kilogram?
One kilogram equals approximately 2.20462 pounds. To convert kilograms to pounds, multiply by 2.20462. To convert pounds to kilograms, divide by 2.20462 or multiply by 0.453592.
What is a stone and how is it used?
A stone is a unit of weight equal to 14 pounds (approximately 6.35 kg). It is commonly used in the UK and Ireland for measuring body weight. For example, a person weighing 154 lbs would be 11 stone 0 lbs.
What is the difference between a metric ton and a US ton?
A metric ton (tonne) equals 1,000 kilograms or approximately 2,204.62 pounds. A US ton (short ton) equals 2,000 pounds or approximately 907.185 kilograms. The metric ton is about 10% heavier than a US ton.
Is weight the same as mass?
Technically, mass and weight are different. Mass measures the amount of matter in an object (in kilograms), while weight measures the gravitational force on that object (in newtons). However, in everyday usage, the terms are used interchangeably, and this converter treats them equivalently on Earth's surface.