 to PSI instantly with this accurate pressure conversion calculator. Ideal for engineering, HVAC and industrial applications with quick and accurate results.){kind=link}
The Millibar to PSI Pressure Unit Conversion Calculator is a calculator designed to instantly convert pressure values between Millibar (mBar) and Pounds per Square Inch (PSI).
Calculator
Millibar → PSI
Pressure Converter
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It is built for engineers, technicians, meteorologists, HVAC professionals and students who regularly work with pressure measurements across different unit systems.
Other than a simple mBar-to-PSI conversion the calculator simultaneously outputs values in 5 additional pressure units that is making it a comprehensive single stop pressure reference online calculating tool.
Understanding Pressure Units
Pressure is defined as the force applied perpendicularly to the surface of an object per unit area.
Different industries and regions use different units of pressure measurement.
The table below summarizes the key units used in this calculator.
Unit Definitions
| Unit | Full Name & Description |
| mBar | Millibar - 1/1000th of a bar. Widely used in meteorology and aviation. 1 bar = 100000 Pa. |
| PSI | Pounds per Square Inch - Standard pressure unit in the US and UK engineering. 1 PSI = 6894.76 Pa. |
| kPa | Kilopascal - SI-derived unit. 1 kPa = 1000 Pa. Common in scientific and engineering contexts. |
| atm | Atmosphere - Standard reference pressure at sea level. 1 atm = 1013.25 mBar = 101,325 Pa. |
| Pa | Pascal - The SI base unit of pressure. Named after Blaise Pascal. Very small and often expressed as kPa or MPa. |
| Torr | Torr (mmHg) - Used in vacuum and laboratory settings. 1 Torr = 1/760 atm = 133.322 Pa. |
Conversion Formulas
All conversions are derived from SI base units.
From Millibar (mBar)
| To PSI | PSI = mBar x 0.0145038 |
| To kPa | kPa = mBar x 0.1 |
| To atm | atm = mBar / 1013.25 |
| To Pa | Pa = mBar x 100 |
| To Torr | Torr = mBar x 0.750062 |
Reverse: From PSI to mBar
If you need to convert from PSI back to mBar use the inverse formula:
| To mBar | mBar = PSI × 68.9476 |
| To kPa | kPa = PSI × 6.89476 |
| To Pa | Pa = PSI × 6894.76 |
| To atm | atm = PSI / 14.696 |
Note: The conversion factor 0.0145038 PSI/mBar is derived from 1 mBar = 100 Pa and 1 PSI = 6894.757 Pa.
Conversion Table
The table below provides pre calculated conversion values for the most commonly used pressure readings:
| Millibar (mBar) | PSI | kPa | atm | Pa |
|---|---|---|---|---|
| 1 | 0.014504 | 0.1000 | 0.000987 | 100 |
| 100 | 1.4504 | 10.000 | 0.09869 | 10,000 |
| 500 | 7.2519 | 50.000 | 0.49346 | 50,000 |
| 1013.25 | 14.696 | 101.33 | 1.00000 | 101,325 |
| 1500 | 21.756 | 150.00 | 1.48038 | 150,000 |
| 3000 | 43.511 | 300.00 | 2.96077 | 300,000 |
Standard Atmospheric Pressure: 1013.25 mBar = 14.696 PSI = 101.325 kPa = 1.000 atm = 101,325 Pa = 760 Torr
How to use the Calculator?
The calculator is very simple & primarily designed for quick & accurate conversions.
Step by Step Instructions
Step-1: Open the calculator to determine the value.
Step-2: In the input field labelled Enter Pressure Value in (mBar).
Step-3: Type any positive numeric mBar value (i.e., decimals are supported. e.g. 1013.25).
Step-4: Click the calculate PSI button (or) press the enter key on the keyboard.
Step-5: The result panel appears instantly and showing the converted PSI value prominently and also kPa, atm, Pa and Torr.
Step-6: Use the Reset / Clear All button to start a new calculation.
| 0 mBar | Absolute zero (0) pressure (vacuum reference) |
| 100 mBar | Low pressure - approximately 10000 m altitude |
| 500 mBar | Mid-range - approximately 5500 m altitude |
| 1013.25 mBar | Standard sea level atmospheric pressure |
| 1500 mBar | Moderate over pressure (industrial reference) |
| 3000 mBar | High pressure (tyre / hydraulic reference) |
Applications
Pressure unit conversion is essential across a wide range of professional and scientific disciplines:
Meteorology & Weather Forecasting
Barometric pressure readings from weather stations are reported in mBar.
Aviation weather (METAR reports) uses the mBar/hPa for altimeter settings.
Standard sea level pressure: 1013.25 mBar = 29.92 inHg = 14.696 PSI.
HVAC & Refrigeration
Refrigerant system pressures are typically measured in PSI.
Duct static pressure may be measured in Pa (or) mBar.
Compressor ratings often provided in PSI; sensors may output mBar.
Automotive & Tyre Industry
Tyre pressure in Europe: kPa (or) bar; in USA: PSI.
Turbocharger boost pressure measured in PSI (or) bar/mBar.
Fuel injection pressures commonly expressed in PSI.
Medical & Scientific
Blood pressure: mmHg (Torr); ventilator pressures: mBar (or) cmH2O.
Laboratory vacuum systems: mBar (or) Torr.
Pressure calibration instruments often output in multiple units.
Oil & Gas / Industrial
Pipeline pressure: PSI (or) bar.
Wellhead pressure sensors: PSI.
Process instrumentation: kPa, bar (or) PSI depending on region.
Terms
| Bar | A metric unit of pressure equal to 100,000 Pascals (100 kPa). It is named from the Greek word 'baros' meaning weight. |
| Millibar (mBar) | One thousandth of a bar (1 mBar = 100 Pa). The primary unit used in this calculator. |
| PSI | Pounds per Square Inch. Imperial/US customary unit. 1 PSI = 6894.76 Pa. |
| Pascal (Pa) | SI base unit of pressure. 1 Pa = 1 N/m2. Named after mathematician Blaise Pascal (1623-1662). |
| Kilopascal (kPa) | 1000 Pascals. Commonly used in engineering and scientific contexts worldwide. |
| Atmosphere (atm) | Defined as 101325 Pa (1013.25 mBar). Represents average air pressure at sea level. |
| Torr | Unit equal to 1/760 of an atmosphere. Equivalent to mmHg (millimetres of mercury). Used in vacuum science. |
| Absolute Pressure | Pressure measured relative to a perfect vacuum (zero pressure). |
| Gauge Pressure | Pressure measured relative to atmospheric pressure. PSI gauge = PSIg. |
| Barometric Pressure | Atmospheric pressure measured at a given location and altitude, reported in mBar or hPa. |
For meteorological purposes, 1 hPa (hectopascal) = 1 mBar and they are numerically identical.
Always verify whether a pressure reading is absolute (or) gauge before converting.
Standard tyre pressure of 32 PSI = 220.6 kPa = 2206 mBar.
Normal blood pressure of 120 mmHg = 160 mBar = 2.32 PSI - units matter clinically.
For very high pressures (hydraulics) convert to bar: 1 bar = 1000 mBar = 14.504 PSI.