Pressure Converter

Convert between different pressure units instantly

Unit Conversion

Pascal (Pa) Kilopascal (kPa) Megapascal (MPa) Bar (bar) Millibar (mbar) Atmosphere (atm) mmHg (mm Hg) Torr (torr) PSI (psi) inHg (in Hg) inH₂O (in H₂O)

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Pascal (Pa) Kilopascal (kPa) Megapascal (MPa) Bar (bar) Millibar (mbar) Atmosphere (atm) mmHg (mm Hg) Torr (torr) PSI (psi) inHg (in Hg) inH₂O (in H₂O)

Pressure Unit Reference

Unit	Symbol	Equivalent to 1 atm

About Pressure Units

Pascal (Pa): SI unit of pressure, equal to one newton per square meter.

Atmosphere (atm): Standard atmospheric pressure at sea level (101,325 Pa).

Bar: Metric unit, approximately equal to atmospheric pressure (1 bar = 100,000 Pa).

PSI: Pounds per square inch, common in the US for tire pressures and scuba tanks.

mmHg/Torr: Based on mercury column height, used in medicine and meteorology.

This tool provides precise pressure unit conversions. Print Reference

A Pressure Converter is an essential tool for engineers, scientists, meteorologists, and DIY enthusiasts that calculates equivalent pressure values between different measurement units. Pressure is a fundamental physical quantity measured in various systems (metric, imperial, scientific), making conversions necessary for accuracy in fields like HVAC, automotive, aerodynamics, and hydraulics.

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How a Pressure Converter Works

The converter uses mathematical relationships between pressure units to instantly translate a given value into the desired unit. Users input:

1. Numerical value

2. Original unit (e.g., psi, bar, Pascal)

3. Target unit

Key Formula

The base unit for pressure in the International System (SI) is the Pascal (Pa). Conversions rely on these relationships:

$$1\text{ Pascal (Pa)}=1{\text{ N/m}}^2$$$$1\text{ bar}=100,\text{\hspace{0.17em}⁣}000\text{ Pa}$$$$1\text{ psi}=6,\text{\hspace{0.17em}⁣}894.76\text{ Pa}$$$$1\text{ atm}=101,\text{\hspace{0.17em}⁣}325\text{ Pa}$$

(See full unit table below.)

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Common Pressure Units

Unit	Symbol	Definition	Common Uses
Pascal	Pa	1 N/m²	Scientific research, engineering
Kilopascal	kPa	1,000 Pa	Automotive tires, meteorology
Megapascal	MPa	1,000,000 Pa	Material strength testing
Bar	bar	100 kPa	Scuba diving, industrial systems
PSI	psi	1 lbf/in²	US tire pressure, hydraulics
Atmosphere	atm	101.325 kPa	Weather reports, aviation
Torr	Torr	1/760 atm ≈ 133.322 Pa	Vacuum systems, medicine
mmHg	mmHg	Pressure to lift 1mm mercury	Blood pressure, barometers

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Step-by-Step Conversion Example

Convert 30 psi to bar:

1. Know the conversion factor:

   $$1\text{ psi}=0.0689476\text{ bar}$$

2. Multiply:

   $$30\text{ psi}\times 0.0689476=2.06843\text{ bar}$$

3. Round if needed:

   $$\approx 2.07\text{ bar}$$

(Most online converters automate this process.)

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Applications of Pressure Conversion

• Automotive: Tire pressure (psi ↔ kPa)

• HVAC: Refrigerant pressure (bar ↔ psi)

• Medical: Blood pressure (mmHg ↔ kPa)

• Aviation: Altitude pressure (atm ↔ hPa)

• Engineering: Hydraulic systems (MPa ↔ psi)

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Conversion Table (Quick Reference)

From/To	Pa	kPa	bar	psi	atm
1 Pa	1	0.001	0.00001	0.000145	0.00000987
1 kPa	1,000	1	0.01	0.145038	0.00986923
1 bar	100,000	100	1	14.5038	0.986923
1 psi	6,894.76	6.89476	0.068948	1	0.068046
1 atm	101,325	101.325	1.01325	14.6959	1