Measurement Unit Converter

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. 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. Results are rounded as you choose using the radio buttons below. For unit info, see the dictionary of Units of Measurement at UNC. For currency conversions, please try Yahoo Finance or Bloomberg.com.

Please select the number of decimal places shown in results:

Temperature Conversion

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Note: For temperatures only, results are rounded to two decimal places. 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 H₂O and 80 = the boiling point.

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 yottameters.

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.

Weight Conversion

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Volume Conversion

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Apoth.: Apothecaries’ | Avdp.: Avoirdupois | Brit.: British | Imp.: Imperial | Ship.: Shipping | Sur.: Survey

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.

Energy 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.

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.

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.

Pressure Conversion

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Metric-System Prefixes