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Pressure

Convert psi to millibars

1 psi=68.9476mbar

Use the converter below to change any psi value into millibars instantly — with formula, conversion table, and real-world examples.

68.94757

Conversion formula

Forward
millibars = psi × 68.9476
Reverse
psi = millibars × 0.0145

Example: 10 psi × 68.9476 = 689.476 mbar.

About both units

From

Pound per Square Inch

psi

Pounds per square inch equals approximately 6895 Pa. It is the dominant pressure unit in the US — tyre pressures, plumbing, compressed air. Standard US tyre pressure: 32–35 psi.

Real-world: US tyre: 32–35 psi. Water supply: 40–60 psi. SCUBA tank: 3000 psi. Car AC system: 30–200 psi.
Read full pound per square inch reference →
To

Millibar

mbar

The millibar equals 100 pascals or 1/1000 bar. It is the traditional unit for atmospheric pressure in meteorology (now called hectopascal, hPa, but numerically identical). Sea-level pressure averages 1013 mbar.

Real-world: Sea-level average: 1013 mbar. Deep low-pressure storm: below 980 mbar. Hurricane eye: below 920 mbar.
Read full millibar reference →

Pound per Square Inch to Millibar conversion table

Common psi to millibars values for quick reference.

Pound per Square Inch (psi)Millibar (mbar)
1 psi68.9476 mbar
5 psi344.738 mbar
10 psi689.476 mbar
25 psi1,723.69 mbar
50 psi3,447.38 mbar
100 psi6,894.76 mbar
200 psi13,789.51 mbar
500 psi34,473.79 mbar
1,000 psi68,947.57 mbar
5,000 psi344,737.86 mbar

Tips & common mistakes

Quick tips

  • 1 psi ≈ 6.9 kPa = 0.069 bar.
  • 14.7 psi = 1 atm = 1.01 bar.
  • Most US pressure gauges show psi.

Avoid these

  • Setting a European tyre at 35 bar instead of 35 psi — disaster.
  • Confusing psi (gauge) with psia (absolute).
  • Using psi in scientific papers — prefer Pa or MPa.

Frequently asked questions

How many millibars in a pound per square inch?
One pound per square inch equals 68.9476 millibars.
How do I convert psi to millibars?
Multiply the pound per square inch value by 68.9476 to get the equivalent in millibars.
What is 100 psi in millibars?
100 psi equals 6,894.76 millibars.
Is a pound per square inch bigger than a millibar?
Yes. 1 pound per square inch equals 68.9476 millibars, so one pound per square inch is larger.
How to convert psi to millibars without a calculator?
Multiply by 68.95 for a quick estimate; use a calculator for precise results.

Related pressure conversions

📊 See full comparison matrix →

More from Pound per Square Inch

psi → Pa
1 = 6,894.76 Pa
psi → kPa
1 = 6.89476 kPa
psi → MPa
1 = 0.006895 MPa
psi → bar
1 = 0.06895 bar
psi → atm
1 = 0.06805 atm
psi → mmHg
1 = 51.7149 mmHg
psi → Torr
1 = 51.7149 Torr
psi → inHg
1 = 2.03602 inHg

More to Millibar

Pa → mbar
1 = 0.01 mbar
kPa → mbar
1 = 10 mbar
MPa → mbar
1 = 10,000 mbar
bar → mbar
1 = 1,000 mbar
atm → mbar
1 = 1,013.25 mbar
mmHg → mbar
1 = 1.33322 mbar
Torr → mbar
1 = 1.33322 mbar
inHg → mbar
1 = 33.8639 mbar

Conversions in other categories

WeightKilogram → PoundLengthKilometer → MileTemperatureCelsius → FahrenheitVolumeLiter → US GallonAreaSquare Meter → Square FootSpeedKilometer per Hour → Mile per HourEnergyKilojoule → KilocaloriePowerKilowatt → Mechanical Horsepower