Daily Unit Converter

Converter category

Pressure Converter

Convert between pascals, kilopascals, megapascals, bars, millibars, PSI, PSF, standard atmosphere, technical atmosphere, torr, mmHg, cmH₂O, inHg, and many other pressure units.

Universal Pressure Converter

About pressure conversions

Pressure conversions are essential in engineering, meteorology, medicine, automotive maintenance, and industrial processes. Our pressure converter covers SI units such as pascals, kilopascals, megapascals, and hectopascals, plus common units like bar, millibar, atmosphere, torr, and millimeters of mercury. It also includes Imperial units such as pounds per square inch, pounds per square foot, inches of mercury, and inches of water. Whether you are checking tire pressure, reading weather reports, calibrating equipment, or studying fluid mechanics, this converter provides accurate, standards-based results.

Most popular pressure conversions

Pascal to Pound per Square Inch

Converts pascal to pound per square inch for pressure.

Pound per Square Inch to Pascal

Converts pound per square inch to pascal for pressure.

Bar to Pound per Square Inch

Converts bar to pound per square inch for pressure.

Pound per Square Inch to Bar

Converts pound per square inch to bar for pressure.

Standard Atmosphere to Pascal

Converts standard atmosphere to pascal for pressure.

Pascal to Standard Atmosphere

Converts pascal to standard atmosphere for pressure.

Kilopascal to Pound per Square Inch

Converts kilopascal to pound per square inch for pressure.

Pound per Square Inch to Kilopascal

Converts pound per square inch to kilopascal for pressure.

Bar to Kilopascal

Converts bar to kilopascal for pressure.

Kilopascal to Bar

Converts kilopascal to bar for pressure.

Available units

Pascal (Pa)Kilopascal (kPa)Megapascal (MPa)Bar (bar)Millibar (mbar)Pound per Square Inch (psi)Pound per Square Foot (psf)Standard Atmosphere (atm)Technical Atmosphere (at)Torr (Torr)Millimeter of Mercury (mmHg)Centimeter of Water (cmH₂O)Inch of Mercury (inHg)Inch of Water (inH₂O)Exapascal (EPa)Petapascal (PPa)Terapascal (TPa)Gigapascal (GPa)Hectopascal (hPa)Decapascal (daPa)Decipascal (dPa)Centipascal (cPa)Millipascal (mPa)Micropascal (µPa)Nanopascal (nPa)Picopascal (pPa)Femtopascal (fPa)Attopascal (aPa)Newton per Square Meter (N/m²)Newton per Square Centimeter (N/cm²)Newton per Square Millimeter (N/mm²)Kilonewton per Square Meter (kN/m²)Microbar (µbar)Dyne per Square Centimeter (dyn/cm²)Kilogram per Square Meter (kg/m²)Kilogram-force per Square Centimeter (kgf/cm²)Kilogram-force per Square Millimeter (kgf/mm²)Gram-force per Square Centimeter (gf/cm²)Ton-force per Square Foot (US) (tonf/ft²)Ton-force per Square Inch (US) (tonf/in²)Ton-force per Square Foot (UK) (tonf UK/ft²)Ton-force per Square Inch (UK) (tonf UK/in²)Kip per Square Inch (ksi)Pound-force per Square Foot (lbf/ft²)Poundal per Square Foot (pdl/ft²)Centimeter of Mercury (cmHg)Millimeter of Mercury (0°C) (mmHg)Inch of Mercury (60°F) (inHg)Centimeter of Water (4°C) (cmH2O)Millimeter of Water (mmH2O)Inch of Water (4°C) (inH2O)Foot of Water (4°C) (ftH2O)Inch of Water (60°F) (inH2O60)Foot of Water (60°F) (ftH2O60)

Popular pressure conversions (2862 total)

Everyday & industrial pressure

Gram-force per Square Centimeter to Ton-force per Square Foot (UK)

Converts gram-force per square centimeter to ton-force per square foot (uk) for pressure.

Gram-force per Square Centimeter to Ton-force per Square Inch (UK)

Converts gram-force per square centimeter to ton-force per square inch (uk) for pressure.

Gram-force per Square Centimeter to Kip per Square Inch

Converts gram-force per square centimeter to kip per square inch for pressure.

Gram-force per Square Centimeter to Pound-force per Square Foot

Converts gram-force per square centimeter to pound-force per square foot for pressure.

Gram-force per Square Centimeter to Poundal per Square Foot

Converts gram-force per square centimeter to poundal per square foot for pressure.

Gram-force per Square Centimeter to Centimeter of Mercury

Converts gram-force per square centimeter to centimeter of mercury for pressure.

Gram-force per Square Centimeter to Millimeter of Mercury (0°C)

Converts gram-force per square centimeter to millimeter of mercury (0°c) for pressure.

Gram-force per Square Centimeter to Inch of Mercury (60°F)

Converts gram-force per square centimeter to inch of mercury (60°f) for pressure.

Gram-force per Square Centimeter to Centimeter of Water (4°C)

Converts gram-force per square centimeter to centimeter of water (4°c) for pressure.

Gram-force per Square Centimeter to Millimeter of Water

Converts gram-force per square centimeter to millimeter of water for pressure.

Gram-force per Square Centimeter to Inch of Water (4°C)

Converts gram-force per square centimeter to inch of water (4°c) for pressure.

Gram-force per Square Centimeter to Foot of Water (4°C)

Converts gram-force per square centimeter to foot of water (4°c) for pressure.

Gram-force per Square Centimeter to Inch of Water (60°F)

Converts gram-force per square centimeter to inch of water (60°f) for pressure.

Gram-force per Square Centimeter to Foot of Water (60°F)

Converts gram-force per square centimeter to foot of water (60°f) for pressure.

Ton-force per Square Foot (US) to Pascal

Converts ton-force per square foot (us) to pascal for pressure.

Ton-force per Square Foot (US) to Kilopascal

Converts ton-force per square foot (us) to kilopascal for pressure.

Ton-force per Square Foot (US) to Megapascal

Converts ton-force per square foot (us) to megapascal for pressure.

Ton-force per Square Foot (US) to Bar

Converts ton-force per square foot (us) to bar for pressure.

Ton-force per Square Foot (US) to Millibar

Converts ton-force per square foot (us) to millibar for pressure.

Ton-force per Square Foot (US) to Pound per Square Inch

Converts ton-force per square foot (us) to pound per square inch for pressure.

Ton-force per Square Foot (US) to Pound per Square Foot

Converts ton-force per square foot (us) to pound per square foot for pressure.

Ton-force per Square Foot (US) to Standard Atmosphere

Converts ton-force per square foot (us) to standard atmosphere for pressure.

Ton-force per Square Foot (US) to Technical Atmosphere

Converts ton-force per square foot (us) to technical atmosphere for pressure.

Ton-force per Square Foot (US) to Torr

Converts ton-force per square foot (us) to torr for pressure.

Ton-force per Square Foot (US) to Millimeter of Mercury

Converts ton-force per square foot (us) to millimeter of mercury for pressure.

Ton-force per Square Foot (US) to Centimeter of Water

Converts ton-force per square foot (us) to centimeter of water for pressure.

Ton-force per Square Foot (US) to Inch of Mercury

Converts ton-force per square foot (us) to inch of mercury for pressure.

Ton-force per Square Foot (US) to Inch of Water

Converts ton-force per square foot (us) to inch of water for pressure.

Ton-force per Square Foot (US) to Exapascal

Converts ton-force per square foot (us) to exapascal for pressure.

Ton-force per Square Foot (US) to Petapascal

Converts ton-force per square foot (us) to petapascal for pressure.

Ton-force per Square Foot (US) to Terapascal

Converts ton-force per square foot (us) to terapascal for pressure.

Ton-force per Square Foot (US) to Gigapascal

Converts ton-force per square foot (us) to gigapascal for pressure.

Ton-force per Square Foot (US) to Hectopascal

Converts ton-force per square foot (us) to hectopascal for pressure.

Ton-force per Square Foot (US) to Decapascal

Converts ton-force per square foot (us) to decapascal for pressure.

Ton-force per Square Foot (US) to Decipascal

Converts ton-force per square foot (us) to decipascal for pressure.

Ton-force per Square Foot (US) to Centipascal

Converts ton-force per square foot (us) to centipascal for pressure.

Ton-force per Square Foot (US) to Millipascal

Converts ton-force per square foot (us) to millipascal for pressure.

Ton-force per Square Foot (US) to Micropascal

Converts ton-force per square foot (us) to micropascal for pressure.

Ton-force per Square Foot (US) to Nanopascal

Converts ton-force per square foot (us) to nanopascal for pressure.

Ton-force per Square Foot (US) to Picopascal

Converts ton-force per square foot (us) to picopascal for pressure.

Ton-force per Square Foot (US) to Femtopascal

Converts ton-force per square foot (us) to femtopascal for pressure.

Ton-force per Square Foot (US) to Attopascal

Converts ton-force per square foot (us) to attopascal for pressure.

Ton-force per Square Foot (US) to Newton per Square Meter

Converts ton-force per square foot (us) to newton per square meter for pressure.

Ton-force per Square Foot (US) to Newton per Square Centimeter

Converts ton-force per square foot (us) to newton per square centimeter for pressure.

Ton-force per Square Foot (US) to Newton per Square Millimeter

Converts ton-force per square foot (us) to newton per square millimeter for pressure.

Ton-force per Square Foot (US) to Kilonewton per Square Meter

Converts ton-force per square foot (us) to kilonewton per square meter for pressure.

Ton-force per Square Foot (US) to Microbar

Converts ton-force per square foot (us) to microbar for pressure.

Ton-force per Square Foot (US) to Dyne per Square Centimeter

Converts ton-force per square foot (us) to dyne per square centimeter for pressure.

Ton-force per Square Foot (US) to Kilogram per Square Meter

Converts ton-force per square foot (us) to kilogram per square meter for pressure.

Ton-force per Square Foot (US) to Kilogram-force per Square Centimeter

Converts ton-force per square foot (us) to kilogram-force per square centimeter for pressure.

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Unit definitions

Pascal (Pa)

The pascal is the SI unit of pressure, defined as one newton per square meter.

Origin: Named after Blaise Pascal, French mathematician and physicist.

Current use: Scientific research, Engineering, Meteorology

Kilopascal (kPa)

A kilopascal is 1000 pascals. Used in engineering and construction.

Origin: Metric prefix kilo- denotes 1000.

Current use: Tire pressure (Europe), Engineering stress, Building codes

Megapascal (MPa)

A megapascal is 1 million pascals or about 145 psi. Used for high-pressure applications.

Origin: Metric prefix mega- denotes 1 million.

Current use: Materials testing, Hydraulic systems, Rock mechanics

Bar (bar)

A bar is 100,000 pascals, close to standard atmospheric pressure (1 atm = 1.01325 bar).

Origin: Introduced by British physicist Napier Shaw in 1909.

Current use: Meteorology, Diving, Industrial hydraulics

Millibar (mbar)

A millibar is 100 pascals. Standard unit in meteorology for atmospheric pressure.

Origin: Widely used in weather forecasting and meteorology.

Current use: Weather forecasting, Altimetry, Aviation

Pound per Square Inch (psi)

PSI is pressure from one pound-force applied to one square inch. 1 psi ≈ 6895 Pa.

Origin: Part of the Imperial/US customary system for pressure measurement.

Current use: Tire pressure, Hydraulic systems, Industrial processes

Pound per Square Foot (psf)

PSF is pressure from one pound-force on one square foot. 1 psf ≈ 47.88 Pa.

Origin: Imperial pressure unit used in US construction and engineering.

Current use: Building design (US), Wind load calculations, Floor loading

Standard Atmosphere (atm)

Standard atmosphere is defined as exactly 101,325 Pa, the average sea-level pressure.

Origin: Defined at the 10th CGPM in 1954.

Current use: Aerospace, Diving, Laboratory standards

Technical Atmosphere (at)

Technical atmosphere is pressure from 1 kgf on 1 cm². About 0.968 atm.

Origin: Used in engineering, particularly in Europe.

Current use: Engineering, Hydraulics, Old Soviet standards

Torr (Torr)

A torr is 1/760 of an atmosphere, nearly equal to 1 mmHg.

Origin: Named after Evangelista Torricelli, inventor of the barometer.

Current use: Vacuum technology, Medical vacuum, Laboratory work

Millimeter of Mercury (mmHg)

mmHg is pressure from 1mm of mercury column. Standard medical unit for blood pressure.

Origin: Derived from mercury barometer measurements.

Current use: Blood pressure, Medical equipment, Vacuum gauges

Centimeter of Water (cmH₂O)

cmH₂O is pressure from a 1 cm water column. About 98 Pa.

Origin: Used in medical equipment and respiration.

Current use: Medical ventilators, Respiratory devices, Plumbing

Inch of Mercury (inHg)

Inch of mercury is pressure from a 1-inch column of mercury. Used in aviation and weather.

Origin: Based on mercury barometer readings.

Current use: Aviation altimeters, Weather reporting, Vacuum gauges

Inch of Water (inH₂O)

Inch of water is pressure from a 1-inch water column. Used for low-pressure measurements.

Origin: Used in plumbing and HVAC applications.

Current use: HVAC, Plumbing, Medical devices

Exapascal (EPa)

1 quintillion pascals. Planetary scale.

Origin: Metric prefix exa- = 10^18.

Current use: Planetary science, Geophysics, Astrophysics

Petapascal (PPa)

Quadrillion pascals. Deep earth.

Origin: Metric prefix peta- = 10^15.

Current use: Geophysics, Deep earth, Research

Terapascal (TPa)

Trillion pascals. Industrial.

Origin: Metric prefix tera- = 10^12.

Current use: Metal forming, Industrial processes, Research

Gigapascal (GPa)

Million atmospheres. Geology.

Origin: Metric prefix giga- = 10^9.

Current use: Geology, Material science, Diamonds

Hectopascal (hPa)

100 pascals. Used for atmospheric pressure.

Origin: Meteorology standard.

Current use: Weather forecasting, Aviation, Meteorology

Decapascal (daPa)

10 pascals. Small pressure.

Origin: Metric prefix deca-.

Current use: Labs, Research

Decipascal (dPa)

0.1 pascal. Very small pressure.

Origin: Metric prefix deci-.

Current use: Acoustics, Labs

Centipascal (cPa)

0.01 pascal. Tiny pressure.

Origin: Metric prefix centi-.

Current use: Research, Microfluidics

Millipascal (mPa)

0.001 pascal. Very small.

Origin: Metric prefix milli-.

Current use: Microelectronics, Labs

Micropascal (µPa)

One millionth of a pascal.

Origin: Metric prefix micro-.

Current use: Acoustics, Seismology

Nanopascal (nPa)

One billionth of a pascal.

Origin: Metric prefix nano-.

Current use: Quantum research, Advanced physics

Picopascal (pPa)

One trillionth of a pascal.

Origin: Metric prefix pico-.

Current use: Ultralow pressure, Research

Femtopascal (fPa)

One quadrillionth of a pascal.

Origin: Metric prefix femto-.

Current use: Advanced research

Attopascal (aPa)

One quintillionth of a pascal.

Origin: Metric prefix atto-.

Current use: Fundamental physics

Newton per Square Meter (N/m²)

Same as pascal. SI pressure unit.

Origin: SI definition.

Current use: Science, Engineering

Newton per Square Centimeter (N/cm²)

10,000 pascals. 0.1 bar.

Origin: Engineering.

Current use: Materials testing, Manufacturing

Newton per Square Millimeter (N/mm²)

1 MPa. High pressure.

Origin: Engineering.

Current use: Metal forming, High pressure

Kilonewton per Square Meter (kN/m²)

1 kPa. Moderate pressure.

Origin: Engineering.

Current use: Geotechnical, Construction

Microbar (µbar)

0.1 pascal. CGS pressure.

Origin: CGS system.

Current use: Acoustics, Meteorology

Dyne per Square Centimeter (dyn/cm²)

CGS pressure = 0.1 Pa. Barye.

Origin: French CGS unit.

Current use: Physics, CGS system

Kilogram per Square Meter (kg/m²)

Pressure from 1 kg/m². 9.8 Pa.

Origin: Simple pressure.

Current use: HVAC, Clean rooms

Kilogram-force per Square Centimeter (kgf/cm²)

Technical atmosphere ≈ 1 bar.

Origin: European engineering.

Current use: German engineering, Old standards

Kilogram-force per Square Millimeter (kgf/mm²)

Very high pressure ≈ 100 atm.

Origin: High pressure.

Current use: Mining, High pressure research

Gram-force per Square Centimeter (gf/cm²)

Small pressure = 98 Pa.

Origin: Small scale.

Current use: Labs, Surface science

Ton-force per Square Foot (US) (tonf/ft²)

High US structural pressure.

Origin: Heavy construction.

Current use: US foundations, Bridges, Heavy loads

Ton-force per Square Inch (US) (tonf/in²)

Very high pressure.

Origin: Heavy engineering.

Current use: Well logging, Mining, Oil

Ton-force per Square Foot (UK) (tonf UK/ft²)

UK structural pressure.

Origin: British engineering.

Current use: UK construction, Foundations

Ton-force per Square Inch (UK) (tonf UK/in²)

Very high UK pressure.

Origin: British heavy.

Current use: UK mining, Oil

Kip per Square Inch (ksi)

1000 psi. Steel strength.

Origin: US structural.

Current use: Steel design, US construction, Materials

Pound-force per Square Foot (lbf/ft²)

47.9 Pa. Floor loading.

Origin: US building.

Current use: US floor loads, Wind load

Poundal per Square Foot (pdl/ft²)

Small Imperial pressure.

Origin: FPS system.

Current use: US physics, Education

Centimeter of Mercury (cmHg)

High pressure blood pressure.

Origin: Medical.

Current use: Blood pressure, Medical, Labs

Millimeter of Mercury (0°C) (mmHg)

Standard blood pressure mmHg.

Origin: Medical standard.

Current use: Blood pressure, Vacuum, Medical

Inch of Mercury (60°F) (inHg)

US weather pressure.

Origin: US meteorology.

Current use: US weather, Aviation (US)

Centimeter of Water (4°C) (cmH2O)

Small pressure unit.

Origin: Medical.

Current use: IV pressure, Medical devices

Millimeter of Water (mmH2O)

Very small pressure.

Origin: Clean rooms.

Current use: Clean rooms, HVAC, Labs

Inch of Water (4°C) (inH2O)

Small Imperial pressure.

Origin: US low pressure.

Current use: US HVAC, Fans

Foot of Water (4°C) (ftH2O)

Moderate Imperial pressure.

Origin: US water.

Current use: Water pressure, Diving

Inch of Water (60°F) (inH2O60)

US standard low pressure.

Origin: US industry.

Current use: US gas pressure, Ventilation

Foot of Water (60°F) (ftH2O60)

US water pressure.

Origin: US water.

Current use: US water systems, Diving

Common uses for pressure conversions

Pressure conversions are used for tire inflation, weather forecasting, blood pressure monitors, HVAC systems, hydraulics, scuba diving, and laboratory work.

Frequently asked questions about pressure

How many pascals are in 1 atmosphere?+

1 standard atmosphere equals 101,325 pascals.

What is the difference between psi and bar?+

PSI stands for pounds per square inch and is common in the US. Bar is a metric unit: 1 bar equals 100,000 pascals, or about 14.5 psi.

Which pressure units does this converter support?+

It supports SI, metric, Imperial, and specialized pressure units used in science, medicine, weather, and industry — over 50 in total.