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Featured pressure sensor products
Differential Pressure Transmitters - Differential pressure transmitters for measuring the DP of fluids and gases across particle filters and along a length of pipe to monitor flow.
4-20mA Output Pressure Sensors - Find reliable pressure sensors with 4-20mA current loop outputs. Designed for demanding industrial applications, offering excellent noise immunity and simplified 2-wire installation for process monitoring.
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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 shortcut buttons or pull down options.
- Select the units to convert to, from the lower shortcut buttons or pull down options.
- The conversion will show in the lower answer box.
You can also copy and paste values into this converter, after pasting a value, click or touch the input box 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
Featured pressure gauge products
16 bar, 200°C steam pressure transmitter and gauge - Combined pressure transmitter and indicator in one package with the option for use with high temperature media such as steam at 200°C
Pressure Indicator Transmitters - Pressure indicator transmitters have a digital indicator for providing a local pressure reading, and a 4-20mA pressure transmitter.
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
Featured pressure data logger products
Pressure Data loggers - Select pressure data loggers with integrated sensors, battery, and memory. Configure sample rates, event triggers, and easily export data for analysis. Ideal for standalone industrial and research monitoring.- Water system peak demand pressure and flow data logger - Identify peak demand and low-pressure events in your water system with the P-Triton-PF data logger. User-configurable logging regimes, 5-year battery life, and IrDA wireless communication.
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.
- quectopascal (qPa) – 1 x 10-30 Pa
- rontopascal (rPa) – 1 x 10-27 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
- ronnapascal (RPa) – 1 x 10+27 Pa
- quettapascal (QPa) – 1 x 10+30 Pa
Featured pascal pressure measurement products
DPS200 HVAC Differential Pressure Transmitter - Differential air pressure sensor with a 10 volt or a 4-20mA output for building ventilation applications. Ranges from 0 to 6 mbar up to 0 to 1000 mbar.
Low Pressure Calibrators - Explore low pressure calibrators featuring fine volume adjustment pumps and high-accuracy indicators for precise calibration in Pa, mbar, or "WC ranges. Ideal for sensitive instruments.
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.
- quectobar (qbar) – 1 x 10-25 Pa
- rontobar (rbar) – 1 x 10-22 Pa
- 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
- ronnabar (Rbar) – 1 x 10+32 Pa
- quettabar (Qbar) – 1 x 10+35 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.
- quectotorr (qTorr) – 1.33322368421053 x 10-28 Pa
- rontotorr (rTorr) – 1.33322368421053 x 10-25 Pa
- 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
- ronnatorr (RTorr) – 1.33322368421053 x 10+29 Pa
- quettatorr (QTorr) – 1.33322368421053 x 10+32 Pa
Featured vacuum pressure measurement products
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DMK457 Marine Approved Pressure Transmitter - Marine approved pressure transmitter with 4-20mA current loop output for shipbuilding with optional CuNiFe housing for sea-water compatibility
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
Featured pressure calibration products
DM01-500-HD High Range Digital Pressure Gauge - The DM01-500 HD high range pressure gauge is available in pressure ranges from 0 to 600, 1000, 1600, 2000 & 2200 bar.
100 bar / 1,500 psi Hand Operated Pressure Calibration Pump – ADT918 - The 918 Pneumatic Pressure Test Pump is a hand operated pressure pump designed to generate pressure from 95% vacuum to 1,500psi (100bar).