Pressure Converter
MeasurementConvert pressure units instantly — pascals, bar, psi, atm, mmHg, torr, and inHg. Perfect for tyre pressure, weather, and engineering in India.
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 |
| Torr | 750.06168 |
| 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.
How to use this Pressure calculator
- Select your source unit from the FROM dropdown — e.g.
Bar (bar). - Enter your value — e.g.
2.2for a recommended tyre pressure of 2.2 bar. - Select your target unit from the TO dropdown — e.g.
Pounds per Sq. Inch (psi). - The result appears instantly — 2.2 bar = 31.91 psi.
- Press ⇅ to swap FROM and TO in one click.
- View the reference table for your value in all 11 units at once.
- 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 psiSet 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
What is a pressure converter?
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.
What is the recommended tyre pressure for Indian cars and in which unit?
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.
What is the difference between bar and psi?
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.
What is blood pressure measured in and why?
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.
What is a pascal and how small is it?
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.
What is atmospheric pressure in common units?
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).
What is the difference between mmHg and torr?
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.
How do I use the Pressure Converter?
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.
What pressure unit do weather forecasts in India use?
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.
What is psi in terms of force and area?
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).
What pressure unit is used in natural gas pipelines in India?
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.
How do I convert kPa to bar?
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.