Convert Psi to Mbar
1 psi equals 68.9476 mbar.
Psi to Mbar Converter
How to Convert Psi to Mbar
1 psi = 68.9476 mbar
Mbar = Psi × 68.9476
Example: 1 psi × 68.9476 = 68.9476 mbar
Reverse Conversion
To convert mbar back to psi:
- Remember, 1 mbar equals 0.0145038 psi.
- To convert 68.9476 mbar to psi, multiply
68.9476 x 0.0145038, resulting in1 psi.
Psi to mbar Conversion Table
Reference table with common psi to mbar conversions. All values calculated with high precision.
Psi to Mbar Table
0.0001 to 12
Psi to Mbar Table
1 to 100000
Mbar to Psi Table
0.01 to 50
Mbar to Psi Table
100 to 10000000
Definition of Psi
PSI: Pound per Square Inch
PSI (pound-force per square inch or lbf/in²) is a unit of pressure commonly used in the United States and other countries that use imperial units. It measures the force in pounds applied to an area of one square inch. PSI is widely used for tire pressure, hydraulic systems, pneumatic tools, and various industrial applications.
Conversions to Other Units of Measurement:
- Bar: 1 psi equals approximately 0.0689476 bar. This conversion is essential for international equipment specifications. For example, 30 psi equals approximately 2.07 bar.
- Pascal (Pa): 1 psi equals approximately 6,894.76 pascals. This conversion connects imperial to SI units. For example, 14.7 psi (approximately 1 atm) equals about 101,325 Pa.
- Kilopascal (kPa): 1 psi equals approximately 6.89476 kPa. This is frequently used in automotive and engineering contexts. For example, a tire pressure of 32 psi equals approximately 220.6 kPa.
- Atmosphere (atm): 1 psi equals approximately 0.068046 atm. Standard atmospheric pressure (1 atm) equals approximately 14.696 psi.
- Kilogram-force per square centimeter (kgf/cm²): 1 psi equals approximately 0.070307 kgf/cm². This conversion is used in older metric equipment.
PSI remains the dominant pressure unit in North America for everyday applications like tire inflation, air compressors, and blood pressure (though medical uses mmHg).
- Definition
- Imperial/US customary pressure unit equal to one pound-force per square inch.
- Exact factor
- 1 psi = 6,894.757293168... Pa
- Common equivalents
- 1 psi ≈ 0.0689476 bar
- 1 psi ≈ 6.89476 kPa
- 14.696 psi ≈ 1 atm
- Sources
Definition of Mbar
Millibar: The Meteorologist's Unit
The millibar (mbar) is a metric unit of pressure equal to one-thousandth of a bar, or 100 pascals. It is the traditional unit used in meteorology for measuring atmospheric pressure and is still widely used in weather forecasting, aviation, and climate science. Standard atmospheric pressure at sea level is approximately 1013.25 mbar.
Conversions to Other Units of Measurement:
- Hectopascal (hPa): 1 millibar equals exactly 1 hectopascal. These units are numerically identical and are used interchangeably in meteorology.
- Pascal (Pa): 1 millibar equals exactly 100 pascals. This is the fundamental SI relationship.
- Bar: 1 millibar equals exactly 0.001 bar. This follows from the definition of the millibar as one-thousandth of a bar.
- Atmosphere (atm): 1 millibar equals approximately 0.000986923 atm. Standard atmospheric pressure (1013.25 mbar) equals approximately 1 atm.
- Inches of Mercury (inHg): 1 millibar equals approximately 0.02953 inHg. This conversion is used in North American weather reports.
The millibar remains the preferred unit for meteorologists worldwide due to its convenient scale for expressing atmospheric pressure variations.
- Definition
- Metric pressure unit equal to one-thousandth of a bar (0.001 bar) or 100 pascals.
- Exact factor
- 1 mbar = 100 Pa (exact); 1 mbar = 1 hPa (exact)
- Common equivalents
- 1 mbar = 0.001 bar (exact)
- 1013.25 mbar = 1 atm (exact)
- 1 mbar ≈ 0.02953 inHg
- Sources
About the Psi
Facts & Uses
- Pounds per square inch — the dominant pressure unit in US and UK engineering. 1 psi = 6894.757 Pa (derived from 1 lbf and 1 in², not exact in SI).
- Standard for US tire pressure (cars 30-35 psi, bicycles 60-100 psi), plumbing (40-80 psi household water), and compressed air tools.
- Common in gauge measurements: psig (gauge, relative to atmospheric) vs psia (absolute, including atmospheric pressure of 14.7 psi).
- Used in scuba diving in the US (3000 psi tanks), oil & gas industry, boiler ratings, and welding cylinders.
Curiosities
- 1 atm = 14.696 psi exactly — the value taught in US chemistry classes as the standard reference for sea-level pressure.
- The pressure inside a champagne bottle is 5-6 bar (75-90 psi) — about three times typical car tire pressure, which is why corks fly with such force.
- The deepest point in the Mariana Trench exerts about 16,000 psi (110 MPa) — over 1000 atmospheres.
- Approximate equivalents: 14.7 psi ≈ 1 atm ≈ 1.01 bar ≈ 101.3 kPa ≈ 760 mmHg.
Sources
Frequently Asked Questions
How many mbar are in one psi?
One psi equals 68.9476 mbar. To convert, multiply the psi value by 68.9476. For the reverse, divide the mbar value by 68.9476 (or multiply by 0.0145038).
What is 0.15 psi in mbar?
0.15 psi = 10.342 mbar. This is one of the most commonly searched conversions for this pair.
How precise is the psi-to-mbar conversion?
The factor 68.9476 is accurate to 6 significant figures, derived from international measurement standards. Our calculator uses full precision internally.
Looking for the reverse? Convert Mbar to Psi
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