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• Same convertor page with unit choices ordered by size... • | |||||

## Measurement Unit Converter |
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Instructions: Enter a number in the left-hand text box in any of the sections, and click on a unit in the left ("from") and/or right ("to") list boxes. A new result appears in the right-hand text box whenever the input value (left-hand box) or either of the unit selections is changed. "NaN" in the right-hand box means the input value is "Not a Number." Use the "Jump to" links above the section headings to navigate to the sections for different measurement types. Conversion is done using JavaScript floating-point math and the most accurate factors I could find. Certain results will have obvious (but very small) inaccuracies. For unit info, please see the dictionary of Units of Measurement at UNC. For currency conversions, please try Yahoo Finance or Bloomberg.com. |
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Please select the number of decimal places shown in results: |
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Jump to: Length | Area | Weight | Volume | Energy/Work | Force | Power | Pressure | Prefixes | |||||

## Temperature Conversion |
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The Rankine scale (proposed in 1859 by the
Scottish physicist William J. M. Rankine) has the same degree
units as Fahrenheit, but with zero = absolute zero. The Reaumur
scale (invented in 1730 by French naturalist René Antoine Ferchault de Reaumur)
has 0 = the freezing point of H |
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## Length / Distance Conversion |
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Note: in survey measure, a square link = 1/100,000
acre, so a link = 0.66 foot. An engineer's link = 1 foot.
The span (arbitrarily) used here is nine inches and the cubit 18
inches. The enormous Hubble unit (one billion light years or
306.595 megaparsecs) is not included here due to size constraints.
FYI, one hubble = about 9.4605 |
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## Area Conversion |
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Note: There are many other old units of land area, such as the South Asian 'bigha' (~.33 acre), the English 'bovate' (~15 ac.) and 'hide' (about 120 ac.), the Dutch 'bunder' (now 1 hectare), the Spanish 'cabellaria' (about 40 ha.), the Irish 'colpa/collop' (~.6555 ha.) and acre (~1.6 English ac.), the Russian 'dessiatina' (1.0925 ha.), the Middle-Eastern 'dunum' (~.1 ha.), the North African 'feddan' (~.42 ha.), the old French 'journal' (~.3-.45 ha.), the Swedish 'tunnland' (~.493 ha.) and numerous others. |
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## Weight Conversion |
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Jump to: Temperature | Length | Area | Weight | Energy/Work | Force | Pressure | Power | Prefixes | |||||

## Volume Conversion |
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Apoth.: Apothecaries' | Avdp.: Avoirdupois | Brit.: British | Imp.: Imperial | Ship.: Shipping | Sur.: Survey |
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Note: U.S. and state legal definitions of a 'barrel' range from 31 to 42 gallons. 'Liter' is actually a special name for the cubic decimeter. |
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## Energy/Work Conversion |
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Note: BTU=British Thermal Unit. A watt is simply a joule per second. Calories/Kcal are the "IT" standard of 1956. |
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## Force Conversion |
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Note: The pound force (lbf) unit represents the force exerted by Earth gravity on a mass of one pound. The poundal is defined as a force which accelerates a one-pound mass at the rate of one foot per second. |
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## Power Conversion |
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Note: The metric horsepower is known in France as the "Cheval Vapeur" (CV) and in Germany as the "pferdestärke". The horsepower, btw, was defined by James Watt as 550 lbf/sec. |
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## Pressure Conversion |
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Jump to: Temperature | Length | Area | Weight | Volume | Energy/Work | Force | Power | |||||

## Metric-System Prefixes |

Prefix | Abbr. | Meaning | Prefix | Abbr. | Meaning |

yotta | Y | 10^{24} (septillion) |
yocto | y | 1/10^{24} |

zetta | Z | 10^{21} (sextillion) |
zepto | z | 1/10^{21} |

exa | E | 10^{18} (quintillion) |
atto | a | 1/10^{18} |

peta | P | 10^{15} (quadrillion) |
femto | f | 1/10^{15} |

tera | T | 10^{12} (trillion) |
pico | p | 1/10^{12} |

giga | G | 10^{9} (billion) |
nano | n | 1/10^{9} |

mega | M | 10^{6} (million) |
micro | µ | 1/10^{6} |

kilo | k | 1000 | milli | m | 1/1000 |

hecto | h | 100 | centi | c | 1/100 |

deka | da | 10 | deci | d | 1/10 |

(Most conversion factors are from the tables
at the U.S. National Institute of
Standards and Technology.)Please see UNC Prof. Russ Rowlett's Dictionary
of Units of Measurement for comprehensive(!!) info on
measurement units & systems and links to many related sites. |