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...

Velocity is a measure of how fast something moves and in what direction. In basic problems, it is of...

Acceleration measures how quickly velocity changes over time. It can be positive (speeding up), nega...

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...

UTC stands for Coordinated Universal Time. It is the primary time standard by which the world regula...

The newton-meter (symbol: Nm) is the SI unit of torque. It represents a force of one newton applied ...

A foot-pound (symbol: ft·lb) is a unit of torque in the imperial and US customary systems. It repres...

An inch-pound (symbol: in·lb) is a unit of torque equal to one twelfth of a foot-pound. It is used f...

A kilogram-force meter (symbol: kgf·m) is a unit of torque representing a force of one kilogram-forc...

The volt (symbol: V) is the SI unit of electric potential difference (voltage). It is defined as the...

A millivolt (symbol: mV) is one thousandth of a volt (0.001 V). Millivolts are used when measuring v...

A kilovolt (symbol: kV) is one thousand volts. Kilovolts are used to describe high-voltage systems w...

TDEE stands for Total Daily Energy Expenditure. It represents the total number of calories your body...

BMR stands for Basal Metabolic Rate. It is the number of calories your body burns at complete rest t...

Macronutrients (or macros) are nutrients required by the body in large amounts. The three main macro...

Body fat percentage is the proportion of your total body weight that is made up of fat mass, as oppo...

Compound interest is interest calculated on the initial principal plus all accumulated interest from...

A fraction represents a part of a whole. It consists of a numerator (the top number, representing pa...