Click buttons below to generate web url address for bookmarking and sharing current settings, or to quickly swap over selected units

**Pressure sensor products**

- TPSA Precision High Pressure Transducer
- DPS200 HVAC Differential Pressure Transmitter
- LMK 487 Submersible Ballast Tank and Draught Level Pressure Transmitter
- DMP331P Hygienic Flush Pressure Transmitter

Request info on pressure sensor products for your application.

Contents

## Related Tools

- Force and area to pressure converter
- Pressure and area to force converter
- Pressure to liquid level calculator
- Liquid level to pressure calculator

## User Guide

This converter and dynamic conversion scale will calculate the equivalent pressure value from one pressure measurement unit to another and generate a conversion table based on the selected units.

- Enter the value you want to convert in the upper input box.
- Select the corresponding units from the upper pull down options.
- Select the units to convert to, from the lower pull down options.
- The conversion will show in the lower text box.

You can use this converter to copy and paste values as well, after pasting a value, just click/touch one of the text boxes or select a unit to convert the value.

## Conversion Guide

Convert pressure units with the pressure unit converting tool, look up a conversion from the tables, identify a pressure unit and its group association with other pressure units, or find the relevant pressure conversion factor in pascals.

### Conversion Tables

Choose a look up table for a specific pressure conversion application.

- Tyre pressure conversion for cars, trucks, cycles, motorbikes or aircraft
- Barometric conversion for mbar, hPa, psi, inHg, mmHg & Torr
- Vacuum conversion for % vac, mbar, hPa, psi, inHg, mmHg & Torr
- Altitude to pressure conversion from feet or metres to mbar, psi, mmHg & inHg
- I/P & P/I conversion for current and pneumatic signal control instrumentation
- E/P & P/E conversion for voltage and pneumatic signal control instrumentation

**Pressure gauge products**

- LEX1 (Ei) High Accuracy Digital Pressure Gauge
- LEO Record (Ei) Capo Low Pressure Logger
- 20 bar digital pressure gauge with USB connection and PC logging
- Autoclave pressure sensor and display with 10 bar range

Request info on pressure gauge products for your application.

### Conversion Factors

The following list shows each pressure unit and its equivalent value converted into pascals (Pa). The pascal is the SI unit for measuring pressure.

#### Unique Conversion Factors

These units have an internationally agreed definition for the conversion factor, some have an exact value with very few digits, while others have a lot of digits and may vary very slightly between reference sources, depending on the level of precision used when calculating the values.

Symbol | Name | Pascals Value |
---|---|---|

bar | Bar | 100,000 |

psi, pfsi, lb/in², lbf/in² | Pounds Force Per Square Inch | 6894.75729316836 … |

mbar, mb, mbr | Millibar | 100 |

N/m² | Newton Per Square Metre | 1 |

Pa | Pascal | 1 |

hPa | Hectopascal | 100 |

kPa | Kilopascal | 1,000 |

MPa | Megapascal | 1,000,000 |

kg/cm², kgf/cm² | Kilogram Per Square Centimetre | 98,066.5 |

Torr | Torr | 133.322368421053 … |

mTorr | Millitorr | 0.133322368421053 … |

atm | Standard Atmosphere | 101,325 |

at | Technical Atmosphere | 98,066.5 |

dyn/cm², dyne/cm² | Dyne Per Square Centimetre | 0.1 |

oz/in², ozf/in² | Ounce Per Square Inch | 430.922330823023 … |

tsi, tfsi (uk, long) | Ton Per Square Inch (uk, long) | 15,444,256.3366971 … |

tsi, tfsi (usa, short) | Ton Per Square Inch (usa, short) | 13,789,514.5863367 … |

tsf, tfsf (usa, short) | Ton Per Square Foot (usa, short) | 95,760.5179606717 … |

psf, pfsf | Pounds Force Per Square Foot | 47.8802589803358 … |

g/cm², gf/cm² | Gram Per Square Centimetre | 98.0665 |

*N.B. Numbers which include […] on the end are rounded.*

#### Manometric Conversion Factors

The following units are known as manometric pressure units and are derived from the pressure exerted by a column of liquid under the acceleration of earth’s gravity. Each manometric pressure unit is shown with its equivalent value converted into pascals (Pa). The pascal is the SI unit for measuring pressure.

Since the pressure of the fluid column can vary with changes in liquid density and local gravity it is important to quantify these factors when using these units. The physical assumptions that these conversions factors are based can be found at the bottom of this section.

The use of manometric units is discouraged by national standard organisations because they do not precisely represent the true pressure and there are differing conventions used for the temperature and density of the liquid which can lead to variation in accuracy.

Symbol | Name | Pascals Value |
---|---|---|

mmH2O, mmWG, mmWC | Millimetres of Water | 9.80665 |

cmH2O, cmWG, cmWC | Centimetres of Water | 98.0665 |

mH2O, mWG, mWC | Metres of Water | 9,806.65 |

inH2O, inWG, inWC | Inches of Water | 249.08891 |

ftH2O, ftWG, ftWC | Feet of Water | 2,989.06692 |

mmHg | Millimetres of Mercury | 133.322387415 |

cmHg | Centimetres of Mercury | 1,333.22387415 |

inHg | Inches of Mercury | 3,386.388640341 |

µHg, µmHg | Microns of Mercury | 0.133322387415 |

The above manometric pressure units assume the following in their derivation and although they are not physical constants they have been accepted as popular conventions and are used universally:

- Standard acceleration due to gravity of 9.80665 m/s²
- Density of pure water at 4 deg C is 1000 kg/m³
- Density of mercury at 0 deg C is 13,595.1 kg/m³

**Pressure data logger products**

- High Pressure Data Logger with a 1500 bar range
- 100 mbar g low range air pressure gauge and logger with G1/4 male fitting
- DM01-500-HD High Range Digital Pressure Gauge
- Water system peak demand pressure and flow data logger

Request info on pressure data logger products for your application.

#### Pascal SI Metric Prefix Pressure Units

These pressure units belong to the SI measurement system where the pascal is derived from the SI units by the following formulas: 1 kg·m^{-1}·s^{-2} ⇒ 1 N·m^{-2} ⇒ 1 Pa.

- yoctopascal (yPa) – 1 x 10
^{-24}Pa - zeptopascal (zPa) – 1 x 10
^{-21}Pa - attopascal (aPa) – 1 x 10
^{-18}Pa - femtopascal (fPa) – 1 x 10
^{-15}Pa - picopascal (pPa) – 1 x 10
^{-12}Pa - nanopascal (nPa) – 1 x 10
^{-9}Pa - micropascal (µPa) – 0.000001 Pa
- millipascal (mPa) – 0.001 Pa
- centipascal (cPa) – 0.01 Pa
- decipascal (dPa) – 0.1 Pa
- pascal (Pa) – 1 Pa
- decapascal (daPa) – 10 Pa
- hectopascal (hPa) – 100 Pa
- kilopascal (kPa) – 1,000 Pa
- megapascal (MPa) – 1,000,000 Pa
- gigapascal (GPa) – 1 x 10
^{+9}Pa - terapascal (TPa) – 1 x 10
^{+12}Pa - petapascal (PPa) – 1 x 10
^{+15}Pa - exapascal (EPa) – 1 x 10
^{+18}Pa - zettapascal (ZPa) – 1 x 10
^{+21}Pa - yottapascal (YPa) – 1 x 10
^{+24}Pa

**Pascal pressure measurement products**

- Low Range USB Pressure Sensors
- 1kPa diff pressure transducer for building air ventilation monitoring
- Low Pressure Range Intrinsically Safe Pressure Transmitters
- DPS200 HVAC Differential Pressure Transmitter

Request info on pascal pressure measurement products for your application.

#### Bar Metric Prefix Pressure Units

These pressure units which belong to the metric unit system where the bar is defined as being exactly equal to 100,000 pascals.

- yoctobar (ybar) – 1 x 10
^{-19}Pa - zeptobar (zbar) – 1 x 10
^{-16}Pa - attobar (abar) – 1 x 10
^{-13}Pa - femtobar (fbar) – 1 x 10
^{-10}Pa - picobar (pbar) – 1 x 10
^{-7}Pa - nanobar (nbar) – 1 x 10
^{-4}Pa - microbar (µbar) – 0.1 Pa
- millibar (mbar) – 100 Pa
- centibar (cbar) – 1,000 Pa
- decibar (dbar) – 10,000 Pa
- bar (bar) – 100,000 Pa
- decabar (dabar) – 1,000,000 Pa
- hectobar (hbar) – 10,000,000 Pa
- kilobar (kbar) – 1 x 10
^{+8}Pa - megabar (Mbar) – 1 x 10
^{+11}Pa - gigabar (Gbar) – 1 x 10
^{+14}Pa - terabar (Tbar) – 1 x 10
^{+17}Pa - petabar (Pbar) – 1 x 10
^{+20}Pa - exabar (Ebar) – 1 x 10
^{+23}Pa - zettabar (Zbar) – 1 x 10
^{+26}Pa - yottabar (Ybar) – 1 x 10
^{+29}Pa

#### Torr Metric Prefix Pressure Units

These pressure units are defined as being exactly equal to 1/760 of one standard atmosphere (101,325 Pa), which can be easily incorporated into calculations simply as 101325/760 Pa which is approximately equal to 133.322 pascals.

- yoctotorr (yTorr) – 1.33322368421053 x 10
^{-22}Pa - zeptotorr (zTorr) – 1.33322368421053 x 10
^{-19}Pa - attotorr (aTorr) – 1.33322368421053 x 10
^{-16}Pa - femtotorr (fTorr) – 1.33322368421053 x 10
^{-13}Pa - picotorr (pTorr) – 1.33322368421053 x 10
^{-10}Pa - nanotorr (nTorr) – 1.33322368421053 x 10
^{-7}Pa - microtorr (µTorr) – 1.33322368421053 x 10
^{-4}Pa - millitorr (mTorr) – 0.133322368421053 Pa
- centitorr (cTorr) – 1.33322368421053 Pa
- decitorr (dTorr) – 13.3322368421053 Pa
- torr (Torr) – 133.322368421053… Pa
- decatorr (daTorr) – 1,333.22368421053 Pa
- hectotorr (hTorr) – 13,332.2368421053 Pa
- kilotorr (kTorr) – 1.33322368421053 x 10
^{+5}Pa - megatorr (MTorr) – 1.33322368421053 x 10
^{+8}Pa - gigatorr (GTorr) – 1.33322368421053 x 10
^{+11}Pa - teratorr (TTorr) – 1.33322368421053 x 10
^{+14}Pa - petatorr (PTorr) – 1.33322368421053 x 10
^{+17}Pa - exatorr (ETorr) – 1.33322368421053 x 10
^{+20}Pa - zettatorr (ZTorr) – 1.33322368421053 x 10
^{+23}Pa - yottatorr (YTorr) – 1.33322368421053 x 10
^{+26}Pa

**Vacuum pressure measurement products**

- Digital vacuum/pressure recorder to replace circular paper chart
- Vacuum logger to measure 0 to -1 bar suction or 0 to 1 bar absolute
- Negative room pressure monitor and logger for multiple zones
- PGS40 Mid Pressure Calibration Hand Pump

Request info on vacuum pressure measurement products for your application.

### Unit Groups

Many units have a similar application or derivation, the use of each varies depending on country, industry and pressure value

#### Units derived from ‘pascal’ the SI unit for pressure

#### Force related pressure units

- N/m²
- dyn/cm², dyne/cm², dynes/cm², d/cm²
- kg/cm², kgf/cm²
- g/cm², gf/cm²
- psi, pfsi, lb/in², lbf/in²
- oz/in², ozf/in²
- tsi (uk, long), tfsi (uk, long)
- tsi (usa, short), tfsi (usa, short)
- tsf (usa, short), tfsf (usa, short)
- psf, pfsf

#### Water related pressure units

- mm H2O, mm WG, mm WC
- cm H2O, cm WG, cm WC
- m H2O, m WG, m WC
- in H2O, in WG, in WC, “H2O, “WG, “WC
- ft H2O, ft WG, ft WC, ‘H2O, ‘WG, ‘WC

#### Mercury related pressure units

#### Atmosphere pressure units

**Pressure calibration products**

- 10 bar calibration reference pressure sensor
- PGS40 Mid Pressure Calibration Hand Pump
- Zero & Span calibration adjustable signal output pressure transducers
- PGS700 High Pressure Calibration Hand Pump

Request info on pressure calibration products for your application.