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Conversion of measurements

Math Javascript

Type your value in the appropriate box, then press the Return key or Tab or click outside the box, and enjoy the results! Finetune the output by setting thousands separator, adjusting the significance, the number of digits following the dot, or comma, if you wish.

Historical development

Units of common measurement vary widely, from time to time, and place to place. Most units of measurement started as a reference to a physical object or concept. The foot was the length of a man's foot, the inch was the width of a man's thumb, an acre was the amount of land a man and two oxen could plow in a day, etc.

At first, most measurements were only approximations, but eventually many country's governments set each at a specific standard to make commerce possible and fair. Often, when people settled new lands, they used the names of old measurements, but set their own standards. Other times, similar sounding measurement names in different countries had greatly different values.

Some measurements were derived from other types of measurements, such as a barrel weight being the weight of a barrel of flour. Often, the same measurement had different values depending on the material being measured, such as a wine tun and a beer tun, or a hank of wool and a hank of cotton. These differences may seem odd today, but they made perfect sense to the people that used them.

A Frenchman first defined what he called the meter as one ten millionth of the distance from the North Pole to the equator along the Prime Meridian. It was later defined, in a more precise method, as the length of the path travelled by white light in vacuum during a time interval of 1/299.792.458 of a second.

The liter was originally defined as a cubic decimeter, and a kilogram was defined as a liter of pure water at a specified temperature. Later, the standard was changed such that a kilogram mass became the standard and the liter was derived as the volume of a kilogram of water. This has caused the liter to become slightly more than a cubic decimeter.

The International System of Standards (SI) was first proposed in France in the 17th century, but was not adopted by the authorities until 1795. The system defined that there was only one standard in each measurement type and each unit greater or less was a power of ten. This made conversions between units much simpler. During the 19th century, more and more countries made this system their standard, but notably not Great Britain or the United States of America. In 1965 Britain began changing to the metric system as a condition of membership in the European Common Market. The US government, recognizing the problems of international trade, officially made the metric system its standard in 1975, and is still getting used to it today.

Angle Measures

Angle
Mil
Second
Minute
Point
Gradient
Degree °
Radian
Circumference

Area Measures

Metric
Square millimeter mm²
Square centimeter cm²
Square decimeter dm²
Square meter
Are are
Hectare ha
Square kilometer km²
Imperial
Square inch in²
Square foot ft²
Square yard yrd²
Square rod
Rood
Acre acre
Square league
Square mile mile²
Other
Dunam

Energy Measures

Energy
Calory
Joule

Length Measures

Metric
Ångstrom Å
Nanometer mm
Micron mm
Millimeter mm
Centimeter cm
Decimeter dm
Meter m
Kilometer km
Fermi
Imperial
Line
Inch in
Hand
Link
Span
Foot ft
Cubit
Yard yd
Rod rd
Chain ch
Furlong fur
Mile mi
Mil mil
League
Nautical
Fathom
Short cable
Cable
Sea mile
Degree
Sea league
Circle
Astronomical
Light second
Light minute
Astronomical unit AU
Light year
Parsec
Old Russian
Verst
Kosaya sazhen
Sazhen
Sea sazhen
Makhovaya sazhen
Arshin
Ell
Vershok
Typographical
Point
Pica

Pressure Measures

Pressure
Pascal Pa
PSI
Bar bar
Atmosphere

Time Measures

Time
Shake
Millisecond ms.
Second sec.
Minute min.
Hour h.
Day
Week
Month
Year

Velocity Measures

Velocity
Knot knot
Kilometer per hour km/h

Volume Measures

Metric
Cubic milimeter ml³
Milliliter ml
Centiliter dl
Deciliter dl
Liter l
Decaliter dal
Hectoliter hl
Cubic meter
Imperial Liquid and Dry
Bushel bu
Peck pk
Gallon
Cubic inch in³
Quart qt
Pint pt
Gill gi
Minim min
Dry ounce fl oz
Dry dram fl dr
U.S. Liquid
Minim min
Fluid dram fl dr
Fluid ounce fl oz
Pint pt
Quart qt
Cubic inch in³
Gallon gal
Cubic foot ft³
Gill gi
Barrel
Cubic yard yd³
Acre foot
Old Russian Liquid
Vedro
Shtoff
Quart
Vine bottle
Vodka bottle
Charka
Shkalik (kosushka)
Old Russian Dry
Chetverik (mera)
Vedro
Garnetz
Cooking
Cup
Coffee spoon
Table spoon
Tea spoon

Weight Measures

Metric
Femtogram fg
Picogram pg
Nanogram ng
Microgram
Milligram mg
Centigram cg
Decigram dg
Gram g
Dekagram dag
Hectogram hg
Pound
Kilogram kg
Myriagram
Ton(ne) (megagram) t
Megaton(ne) (teragram)
Petagram
Exagram
Imperial
Grain
Chaldron chn
Pennyweight
Dram dram
Dram (apot.) drachme
Ounce oz
Pound (troy)
Pound
Mercantile pound
Stone
Quarter (US)
Quarter (UK)
Hundredweight (short)
Hundredweight (long)
Bale (US)
Bale (UK)
Short ton
Long ton
Chemistry
Electronvolt
Electron
Millimass unit
Atomic mass unit (1960)
Atomic mass unit (1973)
Atomic mass unit (1986)
Atomic mass unit (1998)
Avogram (Dalton)
Dyne
Crith
Technische Mass Einheit TME
German
Gran
Quente
Lot(h) L
Unze
Mark
Zentner
Last
Hebrew
Shekel
Tetradrachm
Mina
Talent
Japan
Momme
Tael, tahil
Kwan
Kin
Other
Carat ct
Carat (UK)
Carat (US <1913)
Scruple
Gros
Libra (Ancient Rome)
Libra (Italy)
Funt, funte (Russia)
Libra (Portugal, Spain)
Livre (France)
Flask
Jupiter
Format Layout
Separators
Significance
   
The layout options