Units of Measurement List with unit name, physical (base/derived) quantity, check SI units to measure physical quantities. Units of measurement are standardized quantities used to express the magnitude of physical or derived quantities. These units provide a common language for scientists, engineers, and everyday people to communicate and make accurate measurements.

**What's in this list?**hide

There are various systems of units used around the world, but two of the most common ones are the International System of Units (SI) and the Imperial system.

## Units of Measurement List

Standard Unit of Measurement Physical (Base/Derived) Quantity Meter (m) Length/Distance Kilometer (km) Length/Distance Centimeter (cm) Length/Distance Millimeter (mm) Length/Distance Inch (in) Length/Distance Foot (ft) Length/Distance Yard (yd) Length/Distance Mile (mi) Length/Distance Nautical mile (nmi) Length/Distance Square meter (m²) Area Square kilometer (km²) Area Square centimeter (cm²) Area Square millimeter (mm²) Area Square inch (in²) Area Square foot (ft²) Area Acre (ac) Area Hectare (ha) Area Liter (L) or (l) Volume/Capacity Milliliter (mL) Volume/Capacity Cubic meter (m³) Volume/Capacity Cubic centimeter (cm³) or (cc) Volume/Capacity Cubic inch (in³) Volume/Capacity Gallon (gal) Volume/Capacity Quart (qt) Volume/Capacity Pint (pt) Volume/Capacity Fluid ounce (fl oz) Volume/Capacity Kilogram (kg) Weight/Mass Gram (g) Weight/Mass Milligram (mg) Weight/Mass Ton (metric ton or tonne, t) Weight/Mass Pound (lb) Weight/Mass Ounce (oz) Weight/Mass Second (s) Time Minute (min) Time Hour (h) Time Day (d) Time Week (wk) Time Month (mo) Time Year (yr) Time Celsius (°C) Temperature Fahrenheit (°F) Temperature Kelvin (K) Temperature Meters per second (m/s) Speed Kilometers per hour (km/h) Speed Miles per hour (mph) Speed Knot (nautical mile per hour) Speed Pascal (Pa) Pressure Atmosphere (atm) Pressure Bar (bar) Pressure Millimeter of mercury (mmHg) Pressure Pound per square inch (psi) Pressure Joule (J) Energy/Work Kilowatt-hour (kWh) Energy/Work Calorie (cal) Energy/Work British Thermal Unit (BTU) Energy/Work Watt (W) Power Kilowatt (kW) Power Horsepower (hp) Power Ampere (A) Electric Current Volt (V) Electric Voltage/Potential Difference Hertz (Hz) Frequency Bit (b) Data Storage Byte (B) Data Storage Kilobyte (KB) Data Storage Megabyte (MB) Data Storage Gigabyte (GB) Data Storage Terabyte (TB) Data Storage Petabyte (PB) Data Storage## What is a Physical Quantity

A physical quantity is a property of a material or system that can be quantified by measurement. A physical quantity can be expressed as a value, which is the algebraic multiplication of a numerical value and a unit of measurement. For example, the physical quantity mass, symbol m, can be quantified as m=n kg, where n is the numerical value and kg is the unit symbol (for kilogram).

### Base Quantities

Length, Time, Mass, Thermodyanamic temperature, Amount of substance, Electric Current and Luminous Intensity are base quantities.

### Derived Quantity

Derived quantities are those whose definitions are based on other physical quantities (base quantities). Some of the names of derived quantities are volume, area, wavelength, pressure, frequency among others.