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Pressure Converter

100% Free

Convert pressure between Pascal, kPa, MPa, bar, mbar, PSI, atm, mmHg, Torr, inHg, and more — see every unit at once, instantly and in-browser.

11 Units
Instant
All At Once
100% Client-Side

1. Enter pressure

Quick:

2. Converted results

14.503774
Pound per square inch (PSI)
All pressure units for the entered value
UnitValue
Pascal (Pa)100,000
Kilopascal (kPa)100
Megapascal (MPa)0.1
Bar (bar)1
Millibar (mbar)1,000
Pound per square inch (PSI)14.503774
Standard atmosphere (atm)0.986923
Millimetre of mercury (mmHg)750.06158
Torr (Torr)750.06158
Inch of mercury (inHg)29.529983
Inch of water column (inH₂O)401.46308

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How to Use

  1. 1 Type the pressure value
  2. 2 Choose the unit you're converting from
  3. 3 Choose the unit you're converting to
  4. 4 Read the result, plus every other unit in the table
  5. 5 Use the swap button to reverse the direction

Features

  • 11 units: Pa, kPa, MPa, bar, mbar, PSI, atm, mmHg, Torr, inHg, inH₂O
  • See the value in every unit at once
  • One-click swap between from and to
  • Quick presets for tyre pressure, atmosphere, and weather
  • 8-significant-figure precision
  • 100% in-browser — instant and offline-capable

Why it Matters

Pressure shows up in wildly different units depending on the field — PSI for tyres, bar for diving, hPa/mbar for weather, mmHg for blood pressure, atm in chemistry. Converting between them by hand is error-prone; a converter that shows every unit at once removes the guesswork.

★★★★★

Use Cases

Engineering

Convert between PSI, bar, kPa, and MPa for specs

Automotive

Switch tyre pressure between PSI and bar

Weather & Diving

Work in hPa/mbar and atmospheres

Medical

Read pressures in mmHg and Torr

What this tool does

The Pressure Converter turns a pressure value into every common unit at once — Pascal, kilopascal, megapascal, bar, millibar, PSI, atmosphere, mmHg, Torr, inHg, and inches of water — so you never have to chain conversions by hand.

How it works

Every conversion goes through the SI base unit, the Pascal. Your value is multiplied by the source unit’s pascals-per-unit factor, then divided by the target unit’s factor. Results are rounded to 8 significant figures. Everything runs locally in your browser.

Why so many units?

Different fields standardised on different units: PSI for tyres and US engineering, bar for diving and European industry, hPa/mbar for weather, mmHg/Torr for medicine and vacuum work, and atm in chemistry. Showing them side by side makes cross-field work painless. To understand where each unit comes from, see our pressure units guide.

Privacy

Everything runs in your browser. Nothing you type is uploaded, logged, or stored.

Frequently Asked Questions

How many PSI is 1 bar?
1 bar equals about 14.5038 PSI. Conversely, 1 PSI is about 0.0689 bar. The converter shows the exact figure to 8 significant figures and lists every other unit alongside.
What's the difference between mmHg and Torr?
They are almost identical — both are based on the height of a mercury column. By the modern definition 1 Torr = 1/760 of a standard atmosphere (≈ 133.322 Pa), and 1 mmHg ≈ 133.322 Pa as well. For everyday purposes they are interchangeable.
How is atmospheric pressure measured?
Standard atmospheric pressure is 101,325 Pa, which equals 1 atm, about 1.01325 bar, 1013.25 hPa/mbar, 760 mmHg, or 14.696 PSI. Weather reports usually use hectopascals (hPa), which are numerically the same as millibars.
Is this converter accurate?
Yes. All conversions go through the SI base unit, the Pascal, using standard defined factors, and results are rounded to 8 significant figures. It's suitable for engineering, education, and everyday use.
Does anything I enter get uploaded?
No. The conversion runs entirely in your browser. Nothing you type is uploaded, logged, or stored.
📖

Want to understand the conversions?

Browse all guides →
Pressure Units Explained
pressure

Pressure Units Explained: Pa, bar, PSI, atm & mmHg

A practical guide to pressure units — what a pascal is, how bar, PSI, atmospheres, mmHg and inHg relate, where each is used, and how to convert between them reliably.

25 Jun 2026

5 min read

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