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Pressure Converter

Free web tool: Pressure Converter

Conversion Result

101.325 Kilopascal

Full Conversion Table

Pascal (Pa)

101,325

Kilopascal (kPa)

101.325

Megapascal (MPa)

0.101325

Bar (bar)

1.01325

Millibar (mbar)

1,013.25

psi

14.6959494

Atmosphere (atm)

1

mmHg

760.0021002

Torr

760.0021002

inHg

29.92124357

About Pressure Converter

The Pressure Unit Converter is a free, browser-based tool that converts between the 10 most commonly used pressure units: Pascal (Pa), kilopascal (kPa), megapascal (MPa), bar, millibar (mbar), pounds per square inch (psi), atmosphere (atm), millimeters of mercury (mmHg), Torr, and inches of mercury (inHg). All conversions use exact SI-defined conversion factors — for example, 1 atm = 101,325 Pa and 1 psi = 6,894.757 Pa — so the results are as accurate as IEEE 754 double-precision arithmetic allows.

Engineers, physicists, HVAC technicians, scuba divers, meteorologists, and students regularly switch between pressure units depending on the industry or regional standard. A mechanical engineer may work in MPa for material stress, while a weather station reports in mbar and a hydraulic datasheet lists psi. This tool eliminates manual conversion errors by computing every target unit from a single intermediate Pascal value simultaneously.

The converter works entirely inside your web browser using React state and JavaScript arithmetic — no network requests are ever made. Enter any numeric value, choose a source unit from the dropdown, and the highlighted result card and full conversion table update instantly as you type. A "Swap Units" button lets you reverse the direction of conversion with a single click, and the tool renders correctly on any screen size in both light and dark mode.

Key Features

  • Converts among 10 pressure units: Pa, kPa, MPa, bar, mbar, psi, atm, mmHg, Torr, inHg
  • Full conversion table showing all 10 results simultaneously for any input value
  • Primary result card highlights the chosen target unit in large, easy-to-read text
  • "Swap Units" button instantly reverses the from/to unit selection
  • Uses exact SI conversion factors (1 atm = 101325 Pa, 1 psi = 6894.757 Pa)
  • Smart number formatting: scientific-range values shown in localized notation with up to 10 significant digits
  • 100% client-side — no server calls, no data collection, works offline after first load
  • Responsive layout with full dark mode support for desktop, tablet, and mobile

Frequently Asked Questions

How many pressure units does this converter support?

The converter supports 10 units: Pascal (Pa), kilopascal (kPa), megapascal (MPa), bar, millibar (mbar), psi, atmosphere (atm), mmHg, Torr, and inches of mercury (inHg). All conversions are calculated by first converting the input to Pascals and then dividing by the target unit's Pascal equivalent.

What is the difference between mmHg and Torr?

Historically they were defined differently, but since 1954 the Torr has been defined as exactly 1/760 of a standard atmosphere, giving 1 Torr = 133.322... Pa. The mmHg is defined from the mercury manometer and gives the same value (133.322 Pa). In modern practice the two are treated as numerically identical, and this converter uses the same conversion factor (133.322 Pa) for both.

How accurate are the conversion results?

The tool uses the exact SI-defined conversion factors and JavaScript's 64-bit floating-point (IEEE 754 double-precision) arithmetic, which gives approximately 15–17 significant decimal digits. For engineering purposes this is more than sufficient. Results are displayed with up to 10 significant figures, and very small or large values near zero are shown as "0".

What is standard atmospheric pressure in different units?

1 atm = 101,325 Pa = 101.325 kPa = 0.101325 MPa = 1.01325 bar = 1013.25 mbar = 14.696 psi = 760 mmHg = 760 Torr = 29.921 inHg. These are exact defined values (except psi and inHg which carry the rounding in the definition).

What is the relationship between bar and psi?

1 bar = 100,000 Pa and 1 psi = 6,894.757 Pa, so 1 bar ≈ 14.5038 psi and 1 psi ≈ 0.06895 bar. Bar and psi are commonly used in hydraulics: European equipment often uses bar while American equipment uses psi.

When would I use MPa instead of Pa?

MPa (megapascal, 1 MPa = 1,000,000 Pa) is commonly used in structural and mechanical engineering for material yield strength and stress values. A typical structural steel yield strength is 250 MPa. Using Pa for such values would produce awkwardly large numbers like 250,000,000 Pa.

Can I use this tool for vacuum or negative gauge pressures?

The tool accepts any numeric input including negative values. Negative pressure values represent vacuum or below-atmosphere conditions in gauge pressure terms. The converter treats all values as absolute pressure mathematically, so the arithmetic is correct regardless of sign.

Does the tool work offline?

After the page loads once in your browser, the JavaScript that drives the calculator is cached locally. All conversions execute in your browser with no network requests, so the tool continues to work even if you lose internet connectivity during a session.