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Informal conversion of common measuring units often needs to be done without calculator or computer. This article is an informal listing of some quick and dirty conversions between the Imperial system, the U.S. customary system and the SI. When people say "a foot long" or "ten kilometers from here", they rarely mean ".3048 m" or "6.21571 miles". This article is about post-1824 Imperial units, please see also English unit, U.S. customary unit or Avoirdupois. ...
The U.S. customary units, commonly known in the United States as English units or standard units, are the non-metric units of measurement that are currently used in the U.S., in some cases alongside the metric system of units. ...
The International System of Units (abbreviated SI from the French phrase, Système International dUnités) is the most widely used system of units. ...
These are all rough approximations; for more accurate information, see Conversion of units. This article lists conversion factors between a number of units of measurement. ...
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A kilometre (American spelling: kilometer, symbol: km) is a unit of length equal to 1000 metres (from the Greek words khilia = thousand and metro = count/measure). ...
A mile is any of several units of distance, or, in physics terminology, of length. ...
A nautical mile is a unit of distance, or length, as physical scientists like to call it. ...
A minute of arc, arcminute, or MOA is a unit of angular measurement, equal to one sixtieth (1/60) of one degree. ...
A second of arc or arcsecond is a unit of angular measurement which comprises one-sixtieth of an arcminute, or 1/3600 of a degree of arc or 1/1296000 ≈ 7. ...
The metre, symbol: m, is the basic unit of distance (or of length, in the parlance of the physical sciences) in the International System of Units. ...
Length Length: | 5 cm | ≈ 2 inches (in.) | | 2.5 cm | ≈ 1 in. | | 10 cm | ≈ 4 in. | | 30 cm | ≈ 1 foot (ft.) | | 1 m | ≈ 3 1/3 ft | ≈ 3 ft. | = 1 yard | | 200 m | ≈ 1 furlong | | 1.6 km | ≈ 1 mile | | 5 km | ≈ 3 miles | | 8 km | ≈ 5 miles | A centimetre (American spelling: centimeter, symbol: cm) is an SI unit of length. ...
Mid-19th century tool for converting between different standards of the inch An inch is an Imperial unit of length. ...
The metre, symbol: m, is the basic unit of distance (or of length, in the parlance of the physical sciences) in the International System of Units. ...
This article is about the unit of measure known as the yard. ...
A kilometre (American spelling: kilometer, symbol: km) is a unit of length equal to 1000 metres (from the Greek words khilia = thousand and metro = count/measure). ...
A mile is any of several units of distance, or, in physics terminology, of length. ...
Area Area: | 1 m² | ≈ 10 ft² | | 4000 m² | ≈ 1 acre | | 2 ha | ≈ 5 acres | | 1 km² | ≈ 250 acres | | 5 km² | ≈ 2 square miles |
Volume Volume: | 1 L | ≈ 1 3/4 Imperial pints | | 1 Imperial pint | ≈ 570 ml | ≈ 600 ml | | 4.5 L | ≈ 1 Imperial gallon | | 1 L | ≈ 2 U.S. wet pints | | 4 L | ≈ 1 U.S. wet gallon | | 6 US gallons | ≈ 5 Imperial gallons | | 1 fluid ounce | ≈ 30 ml | | 160 L | ≈ 1 U.S. barrel | The litre (or liter in US) is a metric unit of volume. ...
The pint is a unit of volume. ...
The gallon is a unit of volume used for measuring liquids (as well as dry matter). ...
Mass Mass: | 30 g | ≈ 1 ounce (oz.) | | 200 g | ≈ 7 oz. | | ½ kg | ≈ 1 pound (lb.) | | 1 kg | ≈ 2 lb. | | 50 kg | ≈ 1 long hundredweight (cwt.) | ≈ 1.1 short hundred weight | ≈ 1 short hundred weight | | 1 t | ≈ 1 long ton | ≈ 1.1 short ton | ≈ 1 short ton | Officially the pound is the name for at least three different units of mass: The pound (avoirdupois). ...
The international prototype, made of platinum-iridium, which is kept at the BIPM under conditions specified by the 1st CGPM in 1889. ...
Hundred weight or hundredweight is a unit of measurement for mass in both the system of measurement used in the United Kingdom and Ireland (and previously throughout the British Commonwealth), and in the system used in the United States. ...
A long ton is the name used in the US for the unit called the ton in the avoirdupois or Imperial system of measurements, as used (alongside the metric system) in the United Kingdom and to some extent in other Commonwealth countries. ...
The short ton is a unit of mass equal to 907. ...
Velocity Velocity: | 1 km/h | ≈ 0.3 m/s | ≈ 1 foot per second (ft/s) | | 2 km/h | ≈ ½ m/s | ≈ 1 knot | | 3 km/h | ≈ 1 m/s | ≈ 2 miles per hour (mph) | Kilometre per hour (American spelling: kilometer per hour) is a unit of both speed (scalar) and velocity (vector). ...
Metre per second (U.S. spelling: meter per second) is an SI derived unit of both speed (scalar) and velocity (vector), defined by distance in metres divided by time in seconds. ...
A knot is a non SI unit of speed equal to one nautical mile per hour. ...
Force In physics, the newton (symbol: N) is the SI unit of force, named after Sir Isaac Newton in recognition of his work on classical mechanics. ...
The poundal is a non-SI unit of force. ...
The pound-force is a non-SI unit of force or weight (properly abbreviated lbf or lbf). The pound-force is equal to a mass of one pound multiplied by the standard acceleration due to gravity on Earth (which is defined as exactly 9. ...
Pressure Pressure: | 1 bar = 1000 hPa | ≈ 1 atm | ≈ 15 psi | | 4 mbar = 4 hPa | ≈ 3 torr | = 3 mmHg | | 100 mbar = 10 kPa | ≈ 3 inch mercury | The bar is a measurement unit of pressure, equal to 1,000,000 dynes per square centimetre (baryes), or 100,000 newtons per square metre (pascals). ...
The pascal (symbol Pa) is the SI unit of pressure. ...
Psi has multiple meanings: Psi (Ψ ψ) is a letter of the Greek alphabet. ...
The torr is a unit of pressure. ...
Energy The joule (symbol J, also called newton meter, watt second, or coulomb volt) is the SI unit of energy and work. ...
A calorie refers to a non-SI unit of energy. ...
The British thermal unit (BTU or Btu) is a non-metric unit of energy, used in the United States and, to a lesser extent, the UK (where it is generally only used for heating systems). ...
Power The watt (symbol: W) is the SI derived unit for power. ...
The horsepower (hp) is the name of several non-metric units of power. ...
Temperature - Fahrenheit to Celsius -- subtract 30 and divide by 2
- Celsius to Fahrenheit -- multiply by 2 add 25
Fahrenheit is a temperature scale named after the German physicist Gabriel Fahrenheit (1686–1736), who proposed it in 1724. ...
The degree Celsius (°C) is a unit of temperature named after the Swedish astronomer Anders Celsius (1701–1744), who first proposed a similar system in 1742. ...
More accurate conversions The following conversions can be done in your head with a little practice and are good to about 1%: - A meter is 10% more than a yard
- A liter is 5% more than a U.S. quart
- A kilogram is 10% more than two pounds
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