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Pressure Converter

Instantly convert pressure between pascals, kPa, MPa, bar, psi, atmospheres, torr, mercury and water-column units.

Use a comma or period as the decimal separator; do not use thousands separators.

All units

SI and bar

Use as target unit: Micropascal
Micropascal (µPa)
100,000,000,000
Use as target unit: Millipascal
Millipascal (mPa)
100,000,000
Use as target unit: Pascal
Pascal (Pa)
To
100,000
Use as target unit: Hectopascal
Hectopascal (hPa)
1,000
Use as target unit: Millibar
Millibar (mbar)
1,000
Use as target unit: Kilopascal
Kilopascal (kPa)
100
Use as target unit: Bar
Bar (bar)
From
1
Use as target unit: Megapascal
Megapascal (MPa)
0.1

Atmospheres and technical units

Use as target unit: Technical Atmosphere
Technical Atmosphere (at)
1.01972
Use as target unit: Kilogram-force per square centimetre
Kilogram-force per square centimetre (kgf/cm²)
1.01972
Use as target unit: Standard Atmosphere
Standard Atmosphere (atm)
0.986923

Mercury and vacuum

Use as target unit: Millitorr
Millitorr (mTorr)
750,062
Use as target unit: Torr
Torr (Torr)
750.062
Use as target unit: Millimetre of Mercury
Millimetre of Mercury (mmHg)
750.062
Use as target unit: Inch of Mercury
Inch of Mercury (inHg)
29.53

Water column

Use as target unit: Millimetre of Water
Millimetre of Water (mmH₂O)
10,197.2
Use as target unit: Centimetre of Water
Centimetre of Water (cmH₂O)
1,019.72
Use as target unit: Inch of Water
Inch of Water (inH₂O)
401.463

Imperial and US customary

Use as target unit: Pound-force per Square Foot
Pound-force per Square Foot (psf)
2,088.54
Use as target unit: Pound-force per Square Inch
Pound-force per Square Inch (psi)
14.5038
Use as target unit: Kilopound-force per Square Inch
Kilopound-force per Square Inch (ksi)
0.0145038
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Good to know

The pressure converter converts directly in your browser between SI/bar, atmospheres and technical units, Anglo-American units, mercury/vacuum units, and water column. All results are calculated via a common Pascal base, with transparent definitions such as 1 bar = 100,000 Pa and 1 atm = 101,325 Pa.

Typical searches include bar to psi, pascal to bar, and convert tire pressure. Calculation runs locally in the browser. Important: the unit alone does not distinguish between absolute, relative, and differential pressure — the tool keeps the reference type unchanged and does not, for example, automatically convert bar(g) to bar(a). Torr and mmHg are also nearly but not exactly identical.

Typical use cases

Convert tire pressure and everyday values

Convert bar to psi or pascal to bar, for example for tire pressure, household appliances, or simple technical specifications.

Convert technical pressure figures with the correct reference

Check on data sheets and system specifications whether absolute, relative, or differential pressure is meant before converting the unit — the tool doesn't change the reference type automatically.

Convert vacuum and mercury units

Convert Torr or mmHg into other pressure units, for example for lab, vacuum, or older medical readings.

Tips for better results

Don't confuse reference type with the unit

The unit alone doesn't say whether it's absolute, relative, or differential pressure — the tool doesn't, for example, automatically convert bar(g) to bar(a).

Don't treat Torr and mmHg as exactly identical

Both units are nearly but not exactly the same size — for high-precision applications, it's worth checking the exact definitions.

How it works

Step by step

  1. 1

    Enter value and source unit

    Enter the pressure value and choose the source unit from one of the five groups.

  2. 2

    Choose the target unit

    Choose the target unit, even from a different group.

  3. 3

    Copy the result or swap units

    Copy one or all results, or swap the source and target unit for the next conversion.

Features

Five unit groups

SI and bar, atmospheres and technical units, Anglo-American, mercury and vacuum, and water column.

Local conversion

Calculation happens directly in the browser, without transmission to a server.

Transparent definitions and reference-type notice

Shows exact conversion definitions and explicitly notes that the reference type stays unchanged.

Frequently asked questions

Does the tool convert between absolute and relative pressure?

No. The tool keeps the reference type unchanged; the unit alone does not distinguish between absolute, relative, and differential pressure.

Are Torr and mmHg identical?

Nearly, but not exactly — the two units differ by a very small amount.

Are my inputs uploaded?

No. Conversion runs entirely locally in the browser.

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