Unit Tools

Reaumur

Temperature scale with 0°Re as water freezing point and 80°Re as boiling point.

Rankine

Absolute temperature scale based on Fahrenheit degrees.

Kelvin

Absolute temperature scale with 0 K as absolute zero.

Fahrenheit

Temperature scale where water freezes at 32°F and boils at 212°F.

Celsius

Metric temperature scale with 0°C as water freezing point.

Light-Year

The distance light travels in one year; used for astronomical distances.

Astronomical Unit

The average distance between the Earth and the Sun, approximately 149.6 million kilometers.

Furlong

An old unit of length equal to about 201.168 meters.

Nautical Mile

A unit used in maritime and aviation, equal to approximately 1852 meters.

Inch

An imperial unit equal to 1/12 of a foot.

Foot

An imperial unit equal to 0.3048 meters.

Yard

An imperial unit equal to 0.9144 meters.

Mile

An imperial unit equal to approximately 1.609 kilometers.

Nanometer

One billionth of a meter; used to measure atomic-scale distances.

Micrometer

One millionth of a meter; used for microscopic measurements.

Millimeter

One thousandth of a meter; used for precise measurements.

Centimeter

One hundredth of a meter; used for small measurements.

Kilometer

1000 meters; used for measuring long distances.

Meter

The SI base unit for length.

Long Ton

A British ton equal to 2240 pounds.

Short Ton

An imperial ton equal to 2000 pounds.

Stone

An imperial unit equal to 14 pounds, often used for body weight in the UK.

Tonne

Also known as a metric ton; equals 1000 kilograms.

Ounce

An imperial unit equal to 1/16 of a pound.

Pound

An imperial unit equal to 0.453592 kilograms.

Milligram

One thousandth of a gram.

Gram

One thousandth of a kilogram.

Kilogram

The SI base unit for mass.

BTU per hour

A unit of power used mainly for heating and cooling.

Horsepower

A unit of power roughly equal to 745.7 watts.

Gigawatt

One billion watts; used for massive power generation.

Megawatt

One million watts; used for very high power outputs.

Kilowatt

1000 watts; used for measuring larger power outputs.

Watt

The SI unit of power; one joule per second.

Arcsecond

1/60 of an arcminute; 1/3600 of a degree.

Arcminute

1/60 of a degree.

Gradian

A metric unit of angle where a right angle equals 100 gradians.

Degree

A unit of angle equal to 1/360 of a full circle.

Radian

The SI unit for measuring angles; the angle subtended by an arc equal in length to the radius of the circle.

inHg

Inches of mercury, used primarily in the United States for atmospheric pressure.

mmHg

Millimeters of mercury, used in blood pressure and atmospheric pressure measurements.

Torr

Approximately 1/760 of an atmosphere.

Atmosphere

Standard atmospheric pressure at sea level, approximately 101,325 pascals.

PSI

Pounds per square inch; an imperial unit for pressure.

Bar

Equal to 100,000 pascals.

Kilopascal

1000 pascals.

Pascal

The SI unit for pressure; one newton per square meter.

Knot

A nautical unit of speed equal to one nautical mile per hour.

Mile/hour

An imperial unit for speed; widely used in the United States.

Kilometer/hour

Common unit for speed in transportation; equals about 0.27778 m/s.

Meter/second

The SI unit for speed; measures the distance covered in one second.

Square inch

A small imperial unit of area, equal to 1/144 of a square foot.

Square yard

An imperial unit equal to 9 square feet.

Hectare

A metric unit equal to 10,000 square meters.

Acre

A unit of area equal to 43,560 square feet, often used in agriculture.

Square mile

An imperial unit used for large area measurements.

Square foot

An imperial unit of area; used in real estate and construction in the US.

Square kilometer

A larger unit of area equal to 1,000,000 square meters.

Square meter

The SI unit for area measurement.

BTU

British Thermal Unit; used primarily in heating and cooling to quantify energy.

Electronvolt

A very small unit of energy used in atomic and particle physics; approximately 1.602×10⁻¹⁹ joules.

Kilowatt-hour

1000 watt-hours; the typical unit for household electricity consumption.

Watt-hour

A unit of energy representing one watt of power expended for one hour.

Kilocalorie

Also known as the food calorie; equal to 1000 small calories.

Calorie

A unit of energy often used in food energy; approximately 4.184 joules.

Kilojoule

1000 joules.

Joule

The SI unit of energy; the work done when applying a force of one newton over one meter.

Exabyte

Approximately 1024 petabytes; used in global-scale data analysis.

Petabyte

Approximately 1024 terabytes; used in data centers and cloud storage.

Terabyte

Approximately 1024 gigabytes; used for large-scale storage.

Gigabyte

Approximately 1024 megabytes; widely used for computer storage.

Megabyte

Approximately 1024 kilobytes; used for larger files.

Kilobyte

Approximately 1024 bytes; used for small files.

Byte

The basic unit of digital data, composed of 8 bits.

Imperial Gallon

The British imperial unit of volume.

US Pint

Half of a US quart.

US Quart

A quarter of a US gallon.

US Gallon

A US customary unit of volume.

Cubic Foot

An imperial unit of volume used in construction.

Cubic Inch

An imperial unit of volume.

Cubic Centimeter

Equivalent to a milliliter; often used in medical and scientific contexts.

Milliliter

One thousandth of a liter; used for very small volumes.

Liter

One thousandth of a cubic meter; commonly used for liquids.

Cubic Meter

The SI unit for volume.

Decade

Ten years.

Year

Approximately 365.25 days.

Month

Approximately 30.44 days on average.

Week

Seven days.

Day

Twenty-four hours.

Hour

Sixty minutes.

Minute

Sixty seconds.

Microsecond

One millionth of a second.

Millisecond

One thousandth of a second.

Second

The SI base unit of time.

Gigahertz

One billion hertz.

Megahertz

One million hertz.

Kilohertz

1000 hertz.

Hertz

The SI unit for frequency; one cycle per second.

Tbps

Terabits per second; 1,000,000,000,000 bits per second.

Gbps

Gigabits per second; 1,000,000,000 bits per second.

Mbps

Megabits per second; 1,000,000 bits per second.

kbps

Kilobits per second; 1000 bits per second.

bps

Bits per second; the basic unit for data transmission speed.

lb/ft³

Pounds per cubic foot; an imperial unit for density.

g/cm³

Grams per cubic centimeter; equivalent to 1000 kg/m³.

kg/m³

The SI unit for density; mass per unit volume.

Dyne

A unit of force in the CGS system; equal to 10⁻⁵ newtons.

Pound-force

An imperial unit of force; approximately equal to 4.44822 newtons.

Kilonewton

1000 newtons.

Newton

The SI unit of force; defined as the force needed to accelerate one kilogram at one meter per second squared.

Pound-foot

An imperial unit of torque; the torque produced by a one-pound force acting at a one-foot distance.

Kilogram-force meter

A unit of torque representing the force of one kilogram acting at a one-meter distance.

Newton-meter

The SI unit for torque; represents the moment of force.

Foot-candle

An imperial unit for illuminance; approximately equal to 10.7639 lux.

Lux

The SI unit for illuminance; measures lumens per square meter.