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Calculator Answers

Pressure Converter

Blake Boege
Written by Blake Boege · Founder, Calculator Answers

A pressure converter is a scientific measurement utility that translates force per unit area values between different metric, imperial, and atmospheric systems. The converter supports conversions across pascals (Pa), kilopascals (kPa), bar, millibar, pounds per square inch (psi), standard atmospheres (atm), and millimeters of mercury (mmHg / Torr). It applies standard physical conversion factors to guarantee precision. Engineering students, meteorologists, scuba divers, automotive technicians, and manufacturing operators use this tool to standardize pressure measurements across different systems and environments.

Pick a 'from' unit, a 'to' unit, and enter a value. The calculator returns the converted result plus equivalents in every supported pressure unit.

Quick Answer

Convert pressure measurements between scientific and industrial units. Enter your value and select units to calculate conversions across pascals, bars, psi, and atmospheres.

Pressure is non-negative. · e.g. 30

Internal base unit is the pascal (Pa = N/m²). 1 atm = 101,325 Pa is the standard reference atmosphere.

Pressure

Pound per square inch → Kilopascal

206.842719 kpa

30 psi = 206.842719 kpa

Pascal (Pa)206,842.718795 pa
Kilopascal (kPa)206.842719 kpa
Bar2.068427 bar
Atmosphere (atm)2.041379 atm
Pound per square inch (psi)30 psi
Millimeter of mercury (mmHg)1,551.447756 mmhg
Torr1,551.447977 torr

1 atm = 101,325 Pa = 1.01325 bar = 14.696 psi = 760 mmHg ≈ 760 torr. 1 mmHg ≈ 133.32 Pa. 1 psi ≈ 6,894.76 Pa.

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Examples

30 psi to kPa

≈ 206.84 kPa

1 bar to psi

≈ 14.504 psi

760 mmHg to atm

≈ 1.000 atm

How it works

All units are stored as factors relative to the pascal. Convert through pascals: value times source factor gives pascals, then divide by target factor.

Formula · output = value × factor(from) ÷ factor(to)

1 atm = 101,325 Pa = 1.01325 bar = 14.696 psi = 760 mmHg ≈ 760 torr.

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Frequently asked questions

Pressure is force per unit area. The SI unit is the pascal (Pa = N/m²). 1 atmosphere of pressure at sea level is about 101,325 Pa, or roughly 14.7 psi (pounds per square inch).

1 bar = 100,000 Pa (exact). 1 atmosphere (atm) = 101,325 Pa (exact). They are similar but not identical: 1 atm ≈ 1.01325 bar. The bar is often used in everyday contexts (tire pressure, weather), while atmospheres are a historical reference.

Practically the same in everyday use. mmHg (millimeters of mercury) is defined from the height of a mercury column. 1 torr is defined as 1/760 of an atmosphere. They differ by less than one part in 10 million; treat them as interchangeable for any non-scientific purpose.

Typical passenger-car tire pressure is around 30 to 35 psi, which is about 207 to 241 kPa, or roughly 2.07 to 2.41 bar. Always follow the vehicle's recommended pressure shown on the driver-side door jamb sticker, not the tire's max-rated pressure on the sidewall.

Pascals are the SI base, but they're very small. 1 atm is over 100,000 Pa, so kilopascals (kPa = 1,000 Pa) are far easier to read in most contexts. Industrial and weather pressure is usually in kPa, while precision physics uses pascals.

It can be used as a unit converter for mmHg, which is what blood pressure is reported in. But blood-pressure categorization (Normal, Elevated, Stage 1, Stage 2) needs the dedicated blood pressure calculator, which classifies a reading rather than just converting units.