Case 1
- Pressure to convert
- 1
- From unit
- Bar (bar)
- To unit
- Pounds per square inch (psi)
14.503774
Open with these valuesPressure Converter
14.503774
Result: 14.503774Every unit is a fixed number of pascals, so the value goes into pascals and back out. Two of them are exact by definition: 1 bar is 100,000 Pa and 1 atm is 101,325 Pa, which is 1.01325 bar or 14.6959 psi. The mercury units are conventions, because mercury density depends on temperature.
Most-used pairs
each is its own pageBar to psi1 bar = 14.503774 psiPsi to bar1 psi = 0.068948 barAtmospheres to bar1 atm = 1.01325 barKilopascals to psi1 kPa = 0.145038 psiPsi to kilopascals1 psi = 6.894757 kPammHg to kilopascals1 mmHg = 0.133322 kPa
All 10 units
| Unit | Symbol | In Pa | Typical use |
|---|---|---|---|
| Pascal | Pa | 1 | The SI unit of pressure, one N/m² |
| Hectopascal | hPa | 100 | Air pressure in weather forecasts |
| Kilopascal | kPa | 1,000 | Tyre pressure outside Europe |
| Megapascal | MPa | 1,000,000 | Material strength, hydraulics |
| Bar | bar | 100,000 | Tyre and boiler pressure in Europe |
| Millibar | mbar | 100 | Older weather charts, vacuum work |
| Standard atmosphere | atm | 101,325 | Sea-level air pressure, 101,325 Pa |
| Pounds per square inch | psi | 6,894.757293168 | Tyre pressure in the US and UK |
| Millimetre of mercury | mmHg | 133.322387415 | Blood pressure readings |
| Inch of mercury | inHg | 3,386.389 | US weather reports and aviation |
Bar to Pounds per square inch
prints complete- 1 bar
- 14.503774 psi
- 2 bar
- 29.007548 psi
- 3 bar
- 43.511321 psi
- 4 bar
- 58.015095 psi
- 5 bar
- 72.518869 psi
- 6 bar
- 87.022643 psi
- 7 bar
- 101.526416 psi
- 8 bar
- 116.03019 psi
- 9 bar
- 130.533964 psi
- 10 bar
- 145.037738 psi
- 11 bar
- 159.541512 psi
- 12 bar
- 174.045285 psi
- 13 bar
- 188.549059 psi
- 14 bar
- 203.052833 psi
- 15 bar
- 217.556607 psi
- 16 bar
- 232.06038 psi
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Worked examples
Case 2
- Pressure to convert
- 1
- From unit
- Atmosphere (atm)
- To unit
- Bar (bar)
1.013250
Open with these valuesCase 3
- Pressure to convert
- 1013.25
- From unit
- Hectopascal (hPa)
- To unit
- Atmosphere (atm)
1.000000
Open with these valuesHow it's calculated
result = value × (Pa per from-unit) ÷ (Pa per to-unit)
- StepEnter the pressure figure and pick the unit it is written in.
- StepThe figure is multiplied by the pascals one of that unit stands for.
- ResultThat pascal figure is divided by the pascals of the unit you want.
Reference table
| From | To | Result |
|---|---|---|
| 100 kPa | bar | 1 |
| 1 atm | bar | 1.01325 |
| 1 bar | psi | 14.503774 |
| 1 atm | psi | 14.695949 |
| 1 mmHg | Pa | 133.322387 |
| 1 atm | hPa | 1013.25 |
| 1 psi | Pa | 6894.757293 |
Questions
How do I convert bar to psi?
Multiply the bar figure by about 14.5038. One bar is 14.503774 psi, which is why a tyre inflated to 2 bar reads roughly 29 psi. To go the other way, divide the psi figure by 14.5038.
What is one standard atmosphere?
One standard atmosphere (atm) is defined as exactly 101,325 pascals, the average air pressure at sea level. That is 1.01325 bar, 1013.25 hPa — the unit a weather forecast uses — or about 14.696 psi.
What is the difference between a pascal and a bar?
The pascal is the SI unit of pressure, one newton per square metre, and it is tiny for everyday use. The bar is simply a convenient larger multiple: 1 bar = 100,000 Pa = 100 kPa. Meteorologists use the hectopascal, which is the same size as one millibar.
Why is blood pressure measured in mmHg?
The unit comes from mercury-column manometers, where the pressure was read off as the height the mercury rose. One conventional mmHg is 133.322387 pascals. Medicine kept the unit, so a reading of 120 mmHg is roughly 16 kPa or 0.16 bar.
Sources and last check
Information, not professional advice.