Unit & Measurement Glossary

The meter (symbol: m) is the base unit of length in the International System of Units (SI). It is de...

A kilometer (symbol: km) is a unit of length equal to 1,000 meters. It is the standard unit for meas...

A centimeter (symbol: cm) is a unit of length equal to one hundredth of a meter (0.01 m). It is wide...

A mile (symbol: mi or m) is a unit of length in the imperial and US customary systems, equal to exac...

A foot (symbol: ft, plural: feet) is a unit of length in the imperial and US customary systems, equa...

An inch (symbol: in or ″) is a unit of length in the imperial and US customary systems, equal to exa...

The kilogram (symbol: kg) is the base unit of mass in the International System of Units (SI). Since ...

A gram (symbol: g) is a unit of mass equal to one thousandth of a kilogram (0.001 kg). It is widely ...

A pound (symbol: lb or lbs) is a unit of mass in the imperial and US customary systems, equal to exa...

An ounce (symbol: oz) is a unit of mass in the imperial and US customary systems. The avoirdupois ou...

Celsius (symbol: °C), also known as centigrade, is a temperature scale used in the metric system. It...

Fahrenheit (symbol: °F) is a temperature scale proposed by physicist Daniel Gabriel Fahrenheit in 17...

A square meter (symbol: m²) is the SI unit of area. It is defined as the area of a square whose side...

A square foot (symbol: ft²) is a unit of area in the imperial and US customary systems. It is the ar...

An acre is a unit of land area in the imperial and US customary systems. One acre equals 43,560 squa...

A hectare (symbol: ha) is a unit of area in the metric system equal to 10,000 square meters, or a sq...

A liter (symbol: L or l) is a metric unit of volume equal to 1,000 milliliters or one cubic decimete...

A milliliter (symbol: ml or mL) is a metric unit of volume equal to one thousandth of a liter (0.001...

A gallon is a unit of volume in both the imperial and US customary systems, though they differ sligh...

A cup is a unit of volume used primarily in cooking and baking. The US customary cup equals 236.588 ...

A tablespoon (symbol: tbsp or T) is a unit of volume used in cooking. The US tablespoon equals 14.78...

A teaspoon (symbol: tsp or t) is a unit of volume used in cooking. The US teaspoon equals approximat...

A kilometer per hour (symbol: km/h or kph) is a unit of speed expressing the number of kilometers tr...

A mile per hour (symbol: mph) is a unit of speed expressing the number of miles traveled in one hour...

A byte is the fundamental unit of digital information storage. It consists of 8 bits and can represe...

A kilobyte (symbol: KB) is a unit of digital information equal to 1,024 bytes (2¹⁰). It is used to m...

A megabyte (symbol: MB) is a unit of digital information equal to 1,024 kilobytes or 1,048,576 bytes...

A gigabyte (symbol: GB) is a unit of digital information equal to 1,024 megabytes or approximately o...

A terabyte (symbol: TB) is a unit of digital information equal to 1,024 gigabytes or approximately o...

The second (symbol: s) is the base unit of time in the International System of Units (SI). It is for...

A minute is a unit of time equal to 60 seconds. It is one of the most commonly used units in everyda...

An hour is a unit of time equal to 60 minutes or 3,600 seconds. It is the standard unit for scheduli...

A day is a unit of time equal to 24 hours, 1,440 minutes, or 86,400 seconds. It corresponds to one c...

A week is a unit of time equal to 7 days or 168 hours. It is the standard unit for scheduling in mos...

A year is a unit of time equal to approximately 365.25 days, representing one orbit of the Earth aro...