What does the Pressure Units Converter do?

It converts a pressure value from one unit to another (e.g. Pa, bar, psi, atm, Torr) using a consistent internal reference so conversions are accurate.

Which pressure units are supported?

Supported units typically include Pascal (Pa), kilopascal (kPa), bar, millibar, atmosphere (atm), psi, Torr, mmHg, inHg, and others.

How do I use the converter?

Enter a numeric pressure value, select the “from” unit and the “to” unit, and the tool immediately shows the converted result.

What is the internal reference unit?

Converters like this often use Pascal (Pa) as the internal base unit and then convert to/from it for other units.

Is it precise enough for engineering use?

Yes — the converter handles exact conversion factors and supports a wide range of units, so it’s suitable for engineering, scientific, and everyday tasks.

Converter for All Pressure Units

Select conversion direction

101325 Pa

1 atm

Value

101325 Pa = 1 atm

This pressure converter converts values between common metric, imperial and specialized pressure units with accuracy suitable for engineering, laboratory work and everyday use. Results are computed via pascals as the canonical base so conversions remain consistent and precise.

Table of Contents

What the pressure converter does

Converts pressure between a wide range of units including pascal, kilopascal, megapascal, bar, millibar, atmosphere, torr, millimeter mercury, psi and more.
Simple workflow: choose the input column, choose the output column, then type a number or use the slider to explore values.
Instant results update as you type so you see conversions without delay.
Left visual gauge is fixed for easy comparison of common baseline values, right gauge scales to the output magnitude for clear presentation.
Input supports decimals and scientific notation so very large or very small pressures are handled without loss of precision.

Supported units and common uses

Code	Unit	Typical use
Pa	Pascals	Science and engineering
kPa	Kilopascals	Climate control and automation
MPa	Megapascals	Materials testing and hydraulics
hPa	Hectopascals	Meteorology and weather reports
mbar	Millibars	Weather stations and charts
bar	Bar	Industrial systems and pumps
atm	Atmospheres	Reference and laboratory work
torr	Torr	Vacuum measurement
mmHg	Millimeters of mercury	Medicine and barometers
psi	Pounds per square inch	Automotive and pneumatics
inHg	Inches of mercury	Aviation and barometry
inH2O	Inches of water	HVAC and ventilation
cmH2O	Centimeters of water	Medical devices and breathing systems
kgf/cm²	Kilogram-force per square centimeter	Legacy specifications and technical manuals
ksi	Ksi	Material strength and structural engineering

All conversions use pascals as the base unit. Multiply the input value by the unit factor to get pascals. Then divide by the target unit factor to get the output value. This two step approach guarantees consistent results across any chain of conversions.

Conversion coefficients to pascal

Unit	Factor to Pa	Example
Pa	1	1 Pa equals 1 Pa
kPa	1 000	1 kPa equals 1 000 Pa
MPa	1 000 000	1 MPa equals 1 000 000 Pa
hPa	100	1 hPa equals 100 Pa
mbar	100	1 mbar equals 100 Pa
bar	100 000	1 bar equals 100 000 Pa
atm	101 325	1 atm equals 101 325 Pa
torr	133.322	1 torr equals approximately 133.322 Pa
mmHg	133.322	1 mmHg equals approximately 133.322 Pa
psi	6 894.757	1 psi equals approximately 6 894.757 Pa
inHg	3 386.389	1 inHg equals approximately 3 386.389 Pa
inH2O	249.082	1 inH2O equals approximately 249.082 Pa
cmH2O	98.0665	1 cmH2O equals approximately 98.0665 Pa
kgf_cm2	98 066.5	1 kgf per cm squared equals approximately 98 066.5 Pa
ksi	6 894 757.293	1 ksi equals 1 000 psi which is approximately 6.8948 times ten to the sixth Pa

Quick formulas and practical examples

Keep internal calculations unrounded and only round numbers for display. That avoids accumulation of rounding error when converting between several units.

120 000 Pa converts to about 1.185 atm
85 kPa converts to about 12.33 psi
0.9 bar converts to 90 000 Pa which is about 13.06 psi
745 mmHg converts to about 99 330 Pa
60 psi converts to about 413 685 Pa which is about 4.137 bar

To convert a pressure difference to a liquid column height use the relation p equals rho times g times h. Here rho is liquid density, g is local gravity, and h is column height. This shows why readings from liquid column manometers depend on temperature and fluid composition. When converting millimeters or inches water to pascals make sure the reference fluid is specified.

Convertertation Pressure Units

Best practices and application tips

For weather and atmospheric data use hectopascal or millibar.
For hydraulic systems prefer kilopascal and megapascal.
For HVAC and ventilation prefer inch water or centimeter water for small differential pressures.
When exchanging values between systems always transmit the canonical value in pascals together with the unit label.
When accuracy matters, log raw values, measurement time, sensor serial number and last calibration date to enable later verification and correction.

Common questions

How do I switch conversion direction

Choose the input unit in the left column and the output unit in the right column. The active buttons highlight and conversion happens automatically.

Can I enter scientific notation and decimals

Yes. The input accepts decimal values and scientific notation for very large or very small pressures.

How accurate are the results

All calculations use pascals with standard coefficients. Display output may be rounded for readability, but the result line contains the unrounded numeric value for copying into calculations.

📊 Use this pressure converter for quick reliable conversions, for checking sensor readings and for preparing specifications. For laboratory and critical engineering tasks prefer pascals as the canonical unit to avoid ambiguity and accumulation of rounding error.