Unit Converters

The Metric System and the Imperial System of Measurement

Before looking into the different types of measurements in detail, it's essential to differentiate between the other unit systems used by people depending on where they're in the world.
The Metric system is the most common unit system, which is widely used in lots of countries around the world. Popular metric units include metres, kilograms, litres, and more.
The Imperial system, also known as British Imperial, is another unit system prevalent in the United Kingdom. Foot, gallon, and stone are all Imperial units.

Standardization of measurement units

Measurements most commonly use the International System of Units (SI) to compare with other objects. The system defines seven fundamental units - kilogram, metre, candela, second, ampere, kelvin, and mole.

SI base units

• ampere (symbol: A) – unit of electric current
• kelvin (symbol: K) – unit of temperature
• second (symbol: s) – unit of time
• meter (symbol: m) – unit of length
• kilogram (symbol: kg) – unit of mass
• candela (symbol: cd) – unit of luminous intensity
• mole (symbol: mol) – unit reflecting amount of a substance

Metric prefixes

Everyday use metric prefixes