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Pressure Converter

Measurement

Convert pressure units instantly — pascals, bar, psi, atm, mmHg, torr, and inHg. Perfect for tyre pressure, weather, and engineering calculations.

Reviewed by the thecalcu.com team · Last updated July 13, 2026

From
To
All conversionsfor 1 Bar (bar)
Pascals (Pa)100000
Hectopascals (hPa)1000
Kilopascals (kPa)100
Megapascals (MPa)0.1
Bar (bar)1
Millibar (mbar)1000
Pounds per Sq. Inch (psi)14.503774
Atmospheres (atm)0.98692327
Millimetres of Mercury (mmHg)750.06158
Torr750.06168
Inches of Mercury (inHg)29.52998

What is a Pressure?

A Pressure Converter translates pressure measurements between the unit systems used in engineering, meteorology, medicine, and everyday applications, pascals (Pa), hectopascals (hPa), kilopascals (kPa), megapascals (MPa), bar, millibar (mbar), pounds per square inch (psi), atmospheres (atm), millimetres of mercury (mmHg), torr, and inches of mercury (inHg).

Pressure is force per unit area. Despite measuring the same physical quantity, these 11 units are used in entirely different domains with little overlap, making conversion a constant practical need.

In India, pressure units appear across multiple everyday contexts. Tyre inflation gauges at petrol stations typically show psi; European car manuals specify bar; the owner's manual placard inside the fuel-filler flap may list kPa. Blood pressure monitors display mmHg, a medical convention dating from mercury sphygmomanometers. Weather apps and IMD reports show hPa or mbar. Industrial boilers and hydraulic machinery use bar or MPa. Natural gas pipelines use bar for transmission and mbar for domestic delivery.

Navigating across these unit systems without a converter requires either memorising multiple conversion factors or looking them up individually. This converter handles all 11 units in a single interface, making tyre inflation checks, medical readings, and engineering specifications instantly comparable.

For the force component of pressure calculations, see the Force Converter.

Why Use a Pressure Converter?

Three scenarios account for the majority of everyday pressure conversion needs in India:

Tyre pressure: Indian petrol station pumps almost universally read in psi. European cars and their Indian variants specify tyres in bar. Checking whether 32 psi equals the 2.2 bar recommended by the manufacturer requires a quick conversion, 2.2 bar × 14.504 = 31.9 psi. Close enough, or should you add half a psi? This converter gives you the exact figure.

Blood pressure and medical readings: A doctor's BP reading of 130/85 mmHg, is that the same as what a home digital monitor shows? All mmHg monitors use the same scale, but clinical research papers sometimes report in kPa for international compatibility. 130 mmHg = 17.33 kPa for an exact cross-reference.

Industrial and engineering applications: Compressed air systems, hydraulic circuits, gas cylinders, boilers, and autoclave sterilisers all carry pressure specifications in different units depending on the origin of the equipment. A German-manufactured compressor rated at 8 bar compared to an American rival rated at 116 psi, are they equivalent? (Yes: 8 bar = 116.03 psi.)

Who Should Use This Converter?

Motorists and vehicle owners checking tyre pressure against manufacturer specifications when the gauge unit differs from the manual's recommendation.

Medical professionals, patients, and caregivers cross-referencing blood pressure readings in mmHg against clinical literature that may use kPa, particularly in international research contexts.

Mechanical and process engineers working with hydraulic systems, pneumatics, boilers, and pressure vessels where specifications may originate from different standards bodies (ISO in kPa/MPa, ASME in psi, DIN in bar).

Meteorologists, weather enthusiasts, and amateur ham radio operators who track atmospheric pressure in hPa but encounter legacy mbar references in older equipment manuals.

Scuba divers and mountaineers dealing with altitude or depth pressure changes, where atm and bar are common references. Pair with the Length Converter for depth calculations.

What Insights Does the Pressure Converter Give You?

The primary output delivers full-precision results, 2.2 bar converts to exactly 31.9085 psi, not a rounded 32.

The reference table shows all 11 pressure units simultaneously. Entering standard atmospheric pressure (1 atm) immediately reveals the full equivalence matrix: 101,325 Pa = 1,013.25 hPa = 101.325 kPa = 0.101325 MPa = 1.01325 bar = 1,013.25 mbar = 14.696 psi = 760 mmHg, the entire unit landscape at a glance.

Practical interpretation guide:

  • < 1 kPa: very low pressure differentials, HVAC duct pressures
  • 1–100 kPa: pneumatic low-pressure systems, blood pressure (10–21 kPa), tyre pressure (200–250 kPa)
  • 100–1,000 kPa (1–10 bar): typical compressed air systems, gas cylinders
  • 1–10 MPa (10–100 bar): hydraulic machinery, high-pressure industrial processes
  • > 10 MPa: ultra-high pressure equipment, CNG fuel storage (20 MPa)

How to use this Pressure calculator

  1. Select your source unit from the FROM dropdown, e.g. Bar (bar).
  2. Enter your value, e.g. 2.2 for a recommended tyre pressure of 2.2 bar.
  3. Select your target unit from the TO dropdown, e.g. Pounds per Sq. Inch (psi).
  4. The result appears instantly, 2.2 bar = 31.91 psi.
  5. Press ⇅ to swap FROM and TO in one click.
  6. View the reference table for your value in all 11 units at once.
  7. Copy the URL to share or bookmark the specific conversion.

Formula & Methodology

All units convert to and from pascals (Pa) using exact multipliers:

| Unit | Symbol | Pascals (toBase) |
|---|---|---|
| Pascal | Pa | 1 (base) |
| Hectopascal | hPa | 100 |
| Kilopascal | kPa | 1,000 |
| Megapascal | MPa | 1,000,000 |
| Bar | bar | 100,000 |
| Millibar | mbar | 100 |
| Pound per square inch | psi | 6,894.757293 |
| Standard atmosphere | atm | 101,325 (exact) |
| Millimetre of mercury | mmHg | 133.322387 |
| Torr | Torr | 133.322368 |
| Inch of mercury | inHg | 3,386.389 |

Conversion formula: Result = Input × (F_from ÷ F_to)

Worked example, tyre pressure check:

A Honda City's manual specifies 2.2 bar front tyre pressure. The garage pump reads in psi.

F_from = 100,000 (Pa per bar) F_to   = 6,894.757 (Pa per psi) Input  = 2.2  Result = 2.2 × (100,000 ÷ 6,894.757) = 2.2 × 14.5038 = 31.91 psi

Set the pump to 32 psi.

Common reference values:

| Context | Pressure |
|---|---|
| Standard atmosphere | 101.325 kPa = 1.01325 bar = 14.696 psi |
| Normal blood pressure | 120/80 mmHg = 16.0/10.7 kPa |
| Car tyre (typical) | 30–36 psi = 2.07–2.48 bar |
| CNG vehicle cylinder | 200 bar = 20 MPa = 2,900 psi |
| Bicycle tyre (road) | 80–130 psi = 5.5–9.0 bar |

Frequently Asked Questions

A pressure converter translates a pressure measurement between different unit systems, such as from bar to psi, from pascals (Pa) to atmospheres (atm), or from mmHg to kilopascals (kPa). Pressure is force per unit area, and its measurement units vary by application: meteorology uses hPa and mbar, medical use prefers mmHg, engineering uses bar or psi, and physics uses pascals. This converter supports all 11 major pressure units.
Most Indian passenger cars require tyre pressures between 30–36 psi (2.07–2.48 bar / 207–248 kPa) for front and rear tyres, depending on the manufacturer's recommendation printed in the fuel-filler flap or owner's manual. Indian petrol station air pumps typically display psi, while European tyre gauges use bar. This converter lets you confirm the correct figure whichever unit your gauge reads.
Bar and psi are both units of pressure but from different measurement traditions. One bar equals 100,000 pascals and is a metric unit closely approximating standard atmospheric pressure (1 atm = 1.01325 bar). One psi (pound per square inch) equals approximately 6,895 pascals and comes from the imperial system. The conversion is 1 bar = 14.504 psi, so a tyre inflated to 2.2 bar = 2.2 × 14.504 = 31.9 psi.
Blood pressure is measured in millimetres of mercury (mmHg), a legacy unit from the mercury sphygmomanometer, the traditional inflatable cuff device. A normal adult blood pressure of 120/80 mmHg corresponds to 15.998/10.666 kPa or 1.740/1.160 psi. Modern digital BP monitors still display mmHg to maintain clinical convention and compatibility with decades of medical reference ranges.
A pascal (Pa) is the SI unit of pressure defined as one newton per square metre (N/m²). It is an extremely small unit for everyday purposes, standard atmospheric pressure is 101,325 Pa (about 101 kPa). A person weighing 70 kg standing on one foot (area ≈ 0.015 m²) exerts roughly 45,800 Pa = 45.8 kPa on the floor. In practice, engineers use kilopascals (kPa) or megapascals (MPa) for most applications.
Standard atmospheric pressure (1 atm) is exactly 101,325 Pa = 101.325 kPa = 1.01325 bar = 14.696 psi = 760 mmHg = 760 torr = 29.921 inHg. Actual atmospheric pressure varies with altitude and weather: at 1,000 m elevation (like much of India's Deccan Plateau), pressure is approximately 900 hPa. Indian weather services report atmospheric pressure in hPa (same as millibar).
They are nearly identical but technically distinct. One torr is defined as exactly 1/760 of a standard atmosphere = 133.32237 Pa. One mmHg is defined by the pressure exerted by a 1 mm column of mercury at 0°C under standard gravity = 133.32239 Pa. The difference is about 0.000015%, which is negligible for any practical medical or engineering use. This converter includes both because they appear in different technical standards.
Select your source unit from the FROM dropdown, for example, 'Bar (bar)'. Enter your value, such as 2.2 for a tyre pressure of 2.2 bar. Choose your target unit in the TO dropdown, for example, 'Pounds per Sq. Inch (psi)'. The result appears instantly: 2.2 bar = 31.91 psi. Use the ⇅ swap button to reverse the direction, and see the reference table below for your value in all 11 units simultaneously.
The India Meteorological Department (IMD) and most international weather services report atmospheric pressure in hectopascals (hPa), which is numerically identical to millibar (mbar): 1 hPa = 1 mbar = 100 Pa. A normal sea-level pressure is about 1,013 hPa. Low-pressure systems associated with monsoon depressions or cyclones in the Bay of Bengal and Arabian Sea often fall to 980–995 hPa, and severe cyclones can have central pressures below 950 hPa.
PSI stands for pounds per square inch, the pressure exerted by a force of 1 pound-force distributed over 1 square inch of area. Since 1 lbf = 4.44822 N and 1 in² = 0.000645 m², we get 1 psi = 4.44822 ÷ 0.000645 = 6,894.76 Pa ≈ 6.895 kPa. Industrial hydraulic systems in India commonly operate at 1,000–5,000 psi (69–345 bar), while pneumatic systems typically use 90–120 psi (6.2–8.3 bar).
GAIL and other Indian city gas distribution (CGD) networks operate at varying pressures across pipeline segments: transmission pipelines at 70+ bar (1,015+ psi), distribution at 4 bar (58 psi), and domestic connections at typically 21 mbar (0.3 psi) at the meter outlet. Compressed natural gas (CNG) for vehicles is stored on board at 200 bar (2,900 psi), which drops through a pressure regulator before entering the engine.
Divide kilopascals by 100 to get bar, since 1 bar = 100 kPa (exactly). So 250 kPa = 2.5 bar. This is a common conversion in industrial settings, pneumatic system pressures are often specified in kPa in engineering drawings but read in bar on analogue gauges. The relationship is simple enough to do mentally, but this converter handles the full range of unit pairs including the less obvious ones like MPa to inHg.
Also known as
psi to barbar to psipascal to psipressure unit conversionatm to psikPa to psitire pressure converterkPa to atmmmHg to psiblood pressure unit converterbar to atm