Converter Tools
Pressure Converter
Convert pressure between psi, bar, kPa, MPa, atm, mmHg, inHg, Torr, mbar, hPa, psf, and more. Exact factors, instant results in your browser.
Quick conversions
From unit
SI
Pascal, kilopascal, megapascal, hectopascal
Metric
Bar, millibar, kgf/cm^2
Atmospheric and mercury / water
atm, Torr, mmHg, inHg, mmH2O, inH2O
Imperial / US
psi, ksi, psf
Decimal places
Show units
SI results
Pa is the SI base unit. 1 kPa is 1000 Pa. 1 MPa is 1000 kPa. 1 hPa equals 1 millibar.
Converted
Pascal
220632.2334 Pa
SI base unit. One newton per square meter. Used in physics and engineering specs.
Converted
Kilopascal
220.6322 kPa
Standard everyday SI unit for tire pressure, sphygmomanometers, and HVAC outside the US.
Converted
Megapascal
0.2206 MPa
Materials science, hydraulic systems, geomechanics. 1 MPa equals about 145 psi.
Converted
Hectopascal
2206.3223 hPa
Meteorology default. 1 hPa equals 1 millibar exactly. Sea-level average is about 1013 hPa.
Metric results
1 bar equals exactly 100 kPa, close to one standard atmosphere. kgf/cm^2 is a technical atmosphere still used on some gauges.
Converted
Bar
2.2063 bar
Used in automotive, diving, and industrial gauges. 1 bar is exactly 100 kPa, close to 1 atm.
Converted
Millibar
2206.3223 mbar
Same as hPa. Used by weather services and altimeters. 1013.25 mbar is standard sea level.
Converted
Kilogram-force per cm^2
2.2498 kgf/cm2
Technical atmosphere variant common in Asia and on older gauges. Very close to 1 bar.
Atmospheric, mercury and water
1 atm is defined as exactly 101325 Pa. 1 Torr is 1/760 atm. 1 mmHg uses the conventional value 133.322387415 Pa.
Converted
Standard atmosphere
2.1775 atm
Standard atmosphere defined as exactly 101325 Pa. Used as a reference in chemistry and diving.
Converted
Torr
1654.8778 Torr
1/760 of a standard atmosphere. Used in vacuum systems. Almost identical to mmHg.
Converted
Millimeters of mercury
1654.8776 mmHg
Blood pressure unit. Conventional value 133.322387415 Pa. Normal BP: 120/80 mmHg.
Converted
Inches of mercury
65.1527 inHg
Aviation altimeter setting and US barometers. Standard sea level is 29.92 inHg.
Converted
Millimeters of water
22498.2265 mmH2O
Low-pressure HVAC, manometers, and CPAP machines. 1 cmH2O equals 10 mmH2O.
Converted
Inches of water
885.757 inH2O
HVAC duct static pressure in the US. Often abbreviated WC for water column.
Imperial / US results
1 psi equals 6894.757 Pa. 1 ksi is 1000 psi. 1 psi equals 144 psf because 1 ft^2 is 144 in^2.
Source
Pounds per square inch
32 psi
US default for tire pressure, plumbing, and air tools. 14.504 psi equals 1 bar.
Converted
Kilopounds per square inch
0.032 ksi
1000 psi. Used in US materials engineering (steel yield strength, etc.).
Converted
Pounds per square foot
4608 psf
US structural engineering. Wind load, floor live load. 1 psi equals 144 psf.
Common conversions, in plain English
- 1 psi is about 6.895 kPa, so 32 psi is roughly 220.6 kPa or 2.206 bar.
- 1 bar is exactly 100 kPa and equals 14.5038 psi.
- 1 atm is exactly 101.325 kPa, or 14.696 psi, or 760 mmHg, or 29.921 inHg.
- 1 mmHg is about 0.1333 kPa, so a 120/80 mmHg blood pressure reading is roughly 16.0/10.7 kPa.
- 1 inHg is about 33.864 hPa, so the 29.92 inHg standard sea-level altimeter setting equals 1013.25 hPa.
- 1 Torr is essentially 1 mmHg (both are about 133.322 Pa) and is the default unit in vacuum systems.
Common reference pressures
Tap any value to load it as pascals. Every unit updates instantly.
How to use
- Type a pressure value in the input box. You can also paste a value with a unit, like 32 psi or 1013 hPa.
- Pick the unit your value is in from the From unit grid. Source cards in the results are highlighted in blue.
- Read the equivalent value in every other unit on the cards below. Use the Show units toggle to narrow the grid to SI / metric or imperial only.
- Adjust Decimal places if you need a rounder or more precise result, then tap Copy on any card to copy that reading.
- Use the Quick conversions row for one-tap psi-to-bar, kPa-to-psi, atm-to-bar, mmHg-to-kPa, and other popular pairs, or pick a Common reference pressure to start from a real-world example.
About this tool
Pressure Converter switches a value between every common pressure unit at once. Type a number, pick the unit it is in, and read the equivalent in pascal (Pa), kilopascal (kPa), megapascal (MPa), hectopascal (hPa), bar, millibar, kilogram-force per cm^2, atmosphere (atm), Torr, millimeters of mercury (mmHg), inches of mercury (inHg), millimeters of water (mmH2O), inches of water (inH2O), pounds per square inch (psi), kilopounds per square inch (ksi), and pounds per square foot (psf). Every factor is the exact value or the standard conventional value used by the SI, NIST, and IUPAC: 1 atm is 101325 Pa by definition, 1 bar is exactly 100 kPa, 1 psi is 6894.757293168 Pa, 1 mmHg is 133.322387415 Pa, 1 Torr is 101325/760 Pa, and so on. Conversions go through pascals as the canonical base, which is the standard way to avoid rounding chains and makes the math easy to audit. Quick presets cover the most-searched conversion pairs (psi to bar, bar to psi, kPa to psi, atm to bar, mmHg to kPa, inHg to hPa, Torr to Pa). Real-world reference points let you load typical values with one tap: standard sea-level atmosphere, car and bicycle tire pressures, normal systolic and diastolic blood pressure, scuba depths, household water main pressure, hurricane lows, Mars surface pressure, and steel yield strength. You can switch the source unit any time and the displayed value updates so a swap does not silently change the underlying reading. The unit filter limits the output grid to SI / metric or US / imperial when you only care about one system, and the decimal-places control rounds for human reading without losing precision. Useful for tire pressure (psi to kPa is a real recurring problem), HVAC duct static (inH2O to Pa), diving and barometry (bar to atm), aviation altimeter settings (inHg to hPa), vacuum work (Torr and mbar), medical readings (mmHg and kPa for blood pressure), automotive turbo and oil pressure, materials engineering (ksi to MPa), and meteorology (hPa, inHg, mbar). All math runs in your browser. Nothing is uploaded.
Free to use. Works in your browser. No signup, no login.
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