How to convert 1 bar to 14.5038 psi?

1 bar = 14.5038 psi (atmospheric pressure)

How to convert 1 atmosphere to 101.325 kilopascals?

1 atm = 101.325 kPa (standard atmosphere)

How to convert 760 mmHg to 1 atmosphere?

760 mmHg = 1 atm (standard pressure)

What is pressure and how is it measured?

Pressure is the force applied perpendicular to a surface per unit area. It's measured in pascals (Pa), pounds per square inch (psi), bar, atmospheres (atm), and torr. The SI unit is the pascal: 1 Pa = 1 N/m².

How do I convert psi to bar?

Multiply psi by 0.0689476. Example: 14.7 psi × 0.0689476 ≈ 1.013 bar. 1 bar = 14.5038 psi exactly.

What's the difference between absolute and gauge pressure?

Absolute pressure is relative to a perfect vacuum; gauge pressure is relative to atmospheric pressure. Most tire and industrial gauges read gauge pressure. Sea-level atmospheric pressure is about 14.7 psi or 101.3 kPa absolute.

Why are there so many pressure units?

Regions and industries use different conventions: psi in the US, bar in Europe, pascals in science, mmHg in medicine, inHg in US weather. Each is convenient for its typical range.

How accurate is this pressure converter?

Conversion factors follow NIST and BIPM definitions. Results are calculated to high precision. For example, 1 atm = 101,325 Pa exactly.

What pressure units are used in different fields?

Meteorology: hPa, inHg. Engineering: psi, bar. Medicine: mmHg, torr. Science: Pa, kPa. This converter supports all major units.

Pressure Converter

Tire gauges read psi in the US and bar in Europe. Blood pressure is in mmHg, weather maps in hPa or inHg. Pressure conversions matter for engineering, medicine, and everyday safety — same physical quantity, different scales.

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30 inHg in kPaWeather

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1 MPa in barIndustrial

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Real-World Pressure Scale

How these numbers relate to everyday life

100Pa

Light breeze

Roughly 0.01% of atmospheric pressure; barely measurable.

133.322Pa

1 mmHg

Standard unit for blood pressure; 120/80 mmHg is normal adult.

6,895Pa

1 psi

One pound-force per square inch; US tire gauges use psi.

100,000Pa

1 bar

Metric unit; European tire pressure is usually given in bar.

101,325Pa

Sea level (1 atm)

Standard atmospheric pressure at sea level (NIST).

200,000Pa

Pressure cooker (low)

About 1.97 atm; food cooks faster at higher pressure.

220,000Pa

Car tire (typical)

About 32 psi or 2.2 bar — common for passenger cars.

1,000,000Pa

1 MPa

Hydraulic systems and many industrial specs use MPa.

Who Uses Pressure Conversions?

Automotive & Tires

Tire pressure is critical for safety and wear. US specs are in psi; European in bar. Under-inflation increases rolling resistance and blowout risk.

Recommended 32 psi = 2.21 bar = 220.6 kPa. Check when tires are cold.

Medicine & Clinical

Blood pressure is reported in mmHg worldwide. Ventilator and IV pump settings may use cmH₂O or mmHg; conversion avoids dosing errors.

Normal BP 120/80 mmHg = 16.0/10.7 kPa. Hypertensive crisis often defined as >180/120 mmHg.

Meteorology & Aviation

Altimeter settings use inHg (US) or hPa (international). Pilots and weather services must convert between them for pressure altitude.

29.92 inHg = 1013.25 hPa (standard sea-level pressure).

Hydraulics & Pneumatics

Industrial equipment uses bar in Europe and psi in the US. Relief valves and ratings must match the correct unit to avoid overpressure.

3000 psi hydraulic system = 207 bar. A 200 bar pump is insufficient.

Scuba & Diving

Depth adds about 1 atm per 10 m of seawater. Tank pressure is in bar or psi; partial pressures for gas mixes depend on accurate conversion.

30 m depth ≈ 4 bar absolute. A 200 bar tank at 30 m has 4 bar ambient + 196 bar usable.

Did You Know?

The torr is named after Evangelista Torricelli, who invented the mercury barometer in 1644. 1 torr was defined as 1 mmHg and is now exactly 101325/760 pascals.

Source: NIST

Bar was officially deprecated by ISO in 2004 in favor of the pascal, but it remains widely used in Europe for tire pressure, weather, and industry.

Source: ISO 80000

Standard atmosphere (atm) is defined as exactly 101,325 Pa. It was originally the pressure that would support a 760 mm column of mercury at 0°C.

Source: IUPAC

Common Mistakes to Avoid

Confusing gauge pressure (relative to atmosphere) with absolute pressure

Tire gauges read gauge pressure. Add local atmospheric pressure (~101 kPa) for absolute. 32 psi gauge = 32 + 14.7 ≈ 46.7 psi absolute.

Using 1 bar = 14.5 psi from memory (slightly off)

Exact: 1 bar = 14.5038 psi. For tire pressure, 2.2 bar = 31.9 psi; rounding to 32 psi is fine for most uses.

Treating mmHg and torr as different units

1 mmHg = 1 torr by definition. Blood pressure and vacuum specs use them interchangeably.

Pressure Conversion Formulas

Common to Pascal

psi to kPa× 6.89476
bar to kPa× 100
atm to kPa× 101.325
mmHg to Pa× 133.322

Pascal to common

kPa to psi× 0.145038
kPa to bar÷ 100
Pa to mmHg÷ 133.322
kPa to atm÷ 101.325

Factors from NIST. 1 atm = 101,325 Pa by definition.

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