To use the calculator, place your cursor in the desired unit field and write a number.The calculator will automatically convert your number and display the result in the other unit fields. If needed use the dot "." as the decimal separator.
Use the overview below to better understand the meaning and history of the different weight units.

Gigabar (100,000,000,000,000 Pa)
The bar is a metric unit of pressure, but is not approved as part of the International System of Units (SI). It is defined as exactly equal to 100,000 Pa, which is slightly less than the current average atmospheric pressure on Earth at sea level. One Gigabar is equal to 1,000,000,000 bar.

Terapascal (1,000,000,000,000 Pa)
The pascal (symbol: Pa) is the SI derived unit of pressure used to quantify internal pressure, stress, Young's modulus and ultimate tensile strength. It is defined as one newton per square metre. It is named after the French polymath Blaise Pascal. One Terrapascal is equal to 1,000,000,000,000 pascal.

Megabar (100,000,000,000 Pa)
The bar is a metric unit of pressure, but is not approved as part of the International System of Units (SI). It is defined as exactly equal to 100,000 Pa, which is slightly less than the current average atmospheric pressure on Earth at sea level. One Megabar is equal to 1,000,000 bar.

Gigapascal (1,000,000,000 Pa)
The pascal (symbol: Pa) is the SI derived unit of pressure used to quantify internal pressure, stress, Young's modulus and ultimate tensile strength. It is defined as one newton per square metre. It is named after the French polymath Blaise Pascal. One Gigapascal is equal to 1,000,000,000 pascal.

Kilobar (100,000,000 Pa)
The bar is a metric unit of pressure, but is not approved as part of the International System of Units (SI). It is defined as exactly equal to 100,000 Pa, which is slightly less than the current average atmospheric pressure on Earth at sea level. One Kilobar is equal to 1,000 bar.

Short ton per square inch (13,789,514.56 Pa)
A short ton per (square inch) is the unit of pressure.

Long ton per square inch (13,679,326.44 Pa)
A long ton per (square foot) is the unit of pressure.

Kip per square inch (6894757.28 Pa)
A kip per (square inch) is the unit of pressure.

Megapascal (1,000,000 Pa)
The pascal (symbol: Pa) is the SI derived unit of pressure used to quantify internal pressure, stress, Young's modulus and ultimate tensile strength. It is defined as one newton per square metre. It is named after the French polymath Blaise Pascal. One Megapascal is equal to 1,000,000 pascal.

Newton per square millimeter (1,000,000 Pa)
The pascal (symbol: Pa) is the SI derived unit of pressure used to quantify internal pressure, stress, Young's modulus and ultimate tensile strength. It is defined as one newton per square metre. It is named after the French polymath Blaise Pascal. One Newton per square millimeter is equal to 1,000,000 Newton per square meter.

Atmosphere (101,325 Pa)
The standard atmosphere (symbol: atm) is a unit of pressure defined as 101325 Pa (1.01325 bar). It is sometimes used as a reference or standard pressure. It was originally defined as the pressure exerted by 760 mm of mercury at 0 °C and standard gravity (g = 9.80665 m/s2). It was used as a reference condition for physical and chemical properties, and was implicit in the definition of the Centigrade (later Celsius) scale of temperature by defining 100 °C as being the boiling point of water at this pressure. In 1954, the 10th Conférence Générale des Poids et Mesures (CGPM) adopted standard atmosphere for general use and affirmed its definition of being precisely equal to 1013250 dynes per square centimetre (101325 Pa).

Atmosphere technical (101,325 Pa)
The technical atmosphere (symbol: at) is a nonSI unit of pressure equal to one kilogramforce per square centimeter.

Bar (100,000 Pa)
The bar is a metric unit of pressure, but is not approved as part of the International System of Units (SI). It is defined as exactly equal to 100,000 Pa, which is slightly less than the current average atmospheric pressure on Earth at sea level. The bar and the millibar were introduced by the Norwegian meteorologist Vilhelm Bjerknes, who was a founder of the modern practice of weather forecasting. The International Bureau of Weights and Measures (BIPM) lists the bar as one of the "nonSI units should have the freedom to use", but has declined to include it among the "NonSI units accepted for use with the SI". The bar has been legally recognised in countries of the European Union since 2004. The US National Institute of Standards and Technology (NIST) deprecates its use except for "limited use in meteorology" and lists it as one of several units that "must not be introduced in fields where they are not presently used". The International Astronomical Union (IAU) also lists it under "NonSI units and symbols whose continued use is deprecated".

Short ton per square feet (95,760.52 Pa)
A short ton per (square foot) is the unit of pressure.

Long ton per square feet (94,995.32 Pa)
A long ton per (square foot) is the unit of pressure.

Kip per square foot (47880.26 Pa)
A kip per (square foot) is the unit of pressure.

Foot of Mercury (40,636.664 Pa)
A foot of mercury is the unit of pressure.

Tonne per square meter (9,806.65 Pa)
A tonne per (square meter) is the unit of pressure.

Pound per square inch (6894.76 Pa)
The pound per square inch or, more accurately, poundforce per square inch (symbol: lbf/in2; abbreviation: psi) is a unit of pressure or of stress based on avoirdupois units. It is the pressure resulting from a force of one poundforce applied to an area of one square inch. In SI units, 1 psi is approximately equal to 6895 N/m2.

Inch of Mercury (3,386.39 Pa)
Inch of mercury (inHg and ″Hg) is a unit of measurement for pressure. It is still used for barometric pressure in weather reports, refrigeration and aviation in the United States. It is the pressure exerted by a column of mercury of 1 inch (25.4 mm) in height at the standard acceleration of gravity.

Foot of Water (2,989.0669 Pa)
A foot of water is the unit of pressure.

Kilopascal (1,000 Pa)
The pascal (symbol: Pa) is the SI derived unit of pressure used to quantify internal pressure, stress, Young's modulus and ultimate tensile strength. It is defined as one newton per square metre. It is named after the French polymath Blaise Pascal. One Kilopascal is equal to 1,000 pascal.

Pieze (1,000 Pa)
The pièze is the unit of pressure in the metre–tonne–second system of units (mts system), used, e.g., in the former Soviet Union 1933–1955. It is defined as one sthène per square metre. The symbol is pz.

Inch of Water (249.09 Pa)
Inches of water, inches of water gauge (iwg or in.w.g.), inches water column (inch wc or just wc), inAq, Aq, or inH2O is a nonSI unit for pressure. The units are conventionally used for measurement of certain pressure differentials such as small pressure differences across an orifice, or in a pipeline or shaft. Inches of water can be converted to a pressure unit using the formula for pressure head.

Torr (133.32 Pa)
The torr (symbol: Torr) is a unit of pressure based on an absolute scale, now defined as exactly 1/760 of a standard atmosphere (101.325 kPa). Thus one torr is exactly 101325/760 pascals (≈ 133.32 Pa).

Millibar (100 Pa)
The bar is a metric unit of pressure, but is not approved as part of the International System of Units (SI). It is defined as exactly equal to 100,000 Pa, which is slightly less than the current average atmospheric pressure on Earth at sea level. The bar and the millibar were introduced by the Norwegian meteorologist Vilhelm Bjerknes, who was a founder of the modern practice of weather forecasting. The International Bureau of Weights and Measures (BIPM) lists the bar as one of the "nonSI units should have the freedom to use", but has declined to include it among the "NonSI units accepted for use with the SI". The bar has been legally recognised in countries of the European Union since 2004. The US National Institute of Standards and Technology (NIST) deprecates its use except for "limited use in meteorology" and lists it as one of several units that "must not be introduced in fields where they are not presently used". The International Astronomical Union (IAU) also lists it under "NonSI units and symbols whose continued use is deprecated". One Millibar is equal to 0.001 bar.

Pound per square feet (47.88 Pa)
A pound per (square foot) is the unit of pressure.

Newton per square meter (1 Pa)
The pascal (symbol: Pa) is the SI derived unit of pressure used to quantify internal pressure, stress, Young's modulus and ultimate tensile strength. It is defined as one newton per square metre. It is named after the French polymath Blaise Pascal.

Pascal (1 Pa)
The pascal (symbol: Pa) is the SI derived unit of pressure used to quantify internal pressure, stress, Young's modulus and ultimate tensile strength. It is defined as one newton per square metre. It is named after the French polymath Blaise Pascal. The pascal (Pa) or kilopascal (kPa) as a unit of pressure measurement is widely used throughout the world and has largely replaced the pounds per square inch (psi) unit, except in some countries that still use the imperial measurement system or the US customary system, including the United States. Geophysicists use the gigapascal (GPa) in measuring or calculating tectonic stresses and pressures within the Earth. Medical elastography measures tissue stiffness noninvasively with ultrasound or magnetic resonance imaging, and often displays the Young's modulus or shear modulus of tissue in kilopascals.

Barye (0.1 Pa)
The barye (symbol: Ba), or sometimes barad, barrie, bary, baryd, baryed, or barie, is the centimetre–gram–second (CGS) unit of pressure. It is equal to 1 dyne per square centimetre.

Dyne per square centimeter (0.1 Pa)
The dyne (symbol dyn, from Greek δύναμις, dynamis, meaning power, force) is a derived unit of force specified in the centimetre–gram–second (CGS) system of units, a predecessor of the modern SI.

Microbar (0.1 Pa)
The bar is a metric unit of pressure, but is not approved as part of the International System of Units (SI). It is defined as exactly equal to 100,000 Pa, which is slightly less than the current average atmospheric pressure on Earth at sea level. The bar and the millibar were introduced by the Norwegian meteorologist Vilhelm Bjerknes, who was a founder of the modern practice of weather forecasting. The International Bureau of Weights and Measures (BIPM) lists the bar as one of the "nonSI units should have the freedom to use", but has declined to include it among the "NonSI units accepted for use with the SI". The bar has been legally recognised in countries of the European Union since 2004. The US National Institute of Standards and Technology (NIST) deprecates its use except for "limited use in meteorology" and lists it as one of several units that "must not be introduced in fields where they are not presently used". The International Astronomical Union (IAU) also lists it under "NonSI units and symbols whose continued use is deprecated". One Microbar is equal to 0.000001 bar.

Millipascal (0.001 Pa)
The pascal (symbol: Pa) is the SI derived unit of pressure used to quantify internal pressure, stress, Young's modulus and ultimate tensile strength. It is defined as one newton per square metre. It is named after the French polymath Blaise Pascal. One Millipascal is equal to 0.001 pascal.