Pressure Converter Online Free — Convert Pa, bar, atm, PSI, mmHg, MPa, hPa and More

Instant pressure unit conversion: pascal, bar, atmosphere, PSI, millimeter of mercury, megapascal, hectopascal, kgf/cm² and more. Reference values, formulas and conversion table for automotive, medical and industrial use

Pressure Unit Conversion
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Ratio: 1 bar = 14.504 PSI · 1 atm = 101,325 Pa = 760 mmHg
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Pressure Reference Values
Standard Atmospheric Pressure (1 atm)

Standard atmospheric pressure at sea level: 101,325 Pa = 1.01325 bar = 760 mmHg = 14.696 PSI = 1,013.25 hPa. The universal reference value in chemistry, physics and engineering. Meteorologists express it as 1,013 hPa or mbar

Normal Blood Pressure (120/80 mmHg)

Normal systolic blood pressure: 120 mmHg ≈ 16 kPa ≈ 0.16 bar. Diastolic: 80 mmHg ≈ 10.7 kPa. Medicine universally measures blood pressure in mmHg. High blood pressure is above 140/90 mmHg. Measured with a sphygmomanometer

Car Tire Pressure (2.2 bar / 32 PSI)

Recommended tire pressure for passenger cars: 2.0–2.5 bar (29–36 PSI or 200–250 kPa). Low pressure increases fuel consumption and tire wear; high pressure reduces grip. Always check pressure on cold tires for an accurate reading

Atmospheric Pressure at Mount Everest Summit (~337 hPa)

At 8,849 m altitude, atmospheric pressure drops to ~337 hPa = 33.7 kPa ≈ 253 mmHg — only one third of sea-level pressure. That is why climbers on Everest require supplemental oxygen equipment

Water Pressure at 10 m Depth (~2 bar)

Every 10 m of water depth adds approximately 1 bar (100 kPa) of hydrostatic pressure. At 10 m depth, absolute pressure is ~2 bar = 200 kPa. That is why scuba divers breathe compressed air from pressurized cylinders

Compressed Gas Cylinder (150–200 bar)

Oxygen and scuba tanks are filled to 150–200 bar. For comparison: 200 bar = 20 MPa ≈ 2,901 PSI. Household gas canisters hold only ~1.6–1.7 bar. Industrial hydraulic systems can reach up to 700 bar

Industrial Hydraulics (up to 700 bar)

Industrial hydraulic presses and systems operate at 100–700 bar (10–70 MPa). In industry, pressure is specified in MPa or bar. 700 bar = 70 MPa ≈ 10,150 PSI ≈ 714 kgf/cm²

Average Sea-Level Atmospheric Pressure (~1,013 mbar)

Meteorologists measure atmospheric pressure in hectopascals (hPa) or millibars (mbar) — numerically identical units. Standard: 1,013 mbar. A drop below 1,000 mbar signals a low-pressure system and worsening weather

Pressure Units Explained
Pascal, Kilopascal, Megapascal (Pa, kPa, MPa)

The SI base unit of pressure. 1 Pa = 1 N/m² — extremely small, so kPa (1,000 Pa) and MPa (1,000,000 Pa = 10 bar) are used in practice. Atmospheric pressure = 101.325 kPa. MPa in industry, construction and hydraulics; kPa in meteorology and medicine

Bar and Millibar (bar, mbar)

Non-SI unit widely accepted in practice: 1 bar = 100,000 Pa = 100 kPa = 0.1 MPa. Nearly equal to one atmosphere (1 atm ≈ 1.01325 bar). Widely used for tire pressure, compressors and hydraulics. Millibar = hectopascal (hPa) — the standard unit in weather reports

Standard and Technical Atmosphere (atm, at)

Standard atmosphere (atm): 1 atm = 101,325 Pa = 760 mmHg — average atmospheric pressure at sea level. Technical atmosphere (at): 1 at = 1 kgf/cm² = 98,066.5 Pa ≈ 0.9807 bar. Difference is ~3%. In everyday speech both are called "atmospheres", though they differ

Millimeter of Mercury and Torr (mmHg, Torr)

1 mmHg = 133.322 Pa. Torr — identical in value, named after Torricelli. 760 mmHg = 1 atm = 760 Torr. Used in medicine (blood pressure), vacuum technology and barometry. Normal blood pressure: 120/80 mmHg. mmHg remains a legal unit for blood pressure in most countries

Pound per Square Inch (PSI)

1 PSI = 6,894.757 Pa ≈ 0.06895 bar ≈ 0.068 atm. Standard in the USA and UK for tires, compressors, hydraulics and oil and gas. Recommended car tire pressure: 30–35 PSI (2.07–2.41 bar). 14.696 PSI = 1 atm

Kilogram-force per Square Centimeter (kgf/cm²)

1 kgf/cm² = 98,066.5 Pa ≈ 0.9807 bar — equal to the technical atmosphere (at). Traditionally used in industry across Central and Eastern Europe: boilers, compressors, pipelines. Numerically close to bar, so frequently interchanged in practice

Frequently Asked Questions About Pressure Units
How many bar is one atmosphere?

1 standard atmosphere (atm) = 1.01325 bar. In practice this is rounded to 1 bar ≈ 1 atm. Technical atmosphere (at): 1 at = 0.9807 bar. All three are similar (within ~3%) but not identical — this matters in precise technical calculations.

How do you convert PSI to bar?

Multiply PSI by 0.06895. Example: 32 PSI × 0.06895 ≈ 2.21 bar. Reverse: bar × 14.504 = PSI. 1 bar = 14.504 PSI. This conversion is most commonly needed for tire pressure — US vehicle manuals list PSI while European vehicles use bar.

How do you convert mmHg to kPa?

Multiply mmHg by 0.133322. Example: 760 mmHg × 0.133322 ≈ 101.33 kPa. Reverse: kPa × 7.5006 = mmHg. This is useful for converting blood pressure or atmospheric pressure between unit systems.

What is the difference between standard and technical atmosphere?

Standard atmosphere (atm): 1 atm = 101,325 Pa = 760 mmHg — average sea-level air pressure. Technical atmosphere (at): 1 at = 1 kgf/cm² = 98,066.5 Pa. The difference is ~3%. In everyday speech both are called "atmospheres", even though they are different units.

What unit is used for tire pressure?

In the USA: PSI (pounds per square inch). In Europe: bar or kPa. The SI standard is kilopascal (kPa). Recommended for passenger cars: 2.0–2.5 bar = 29–36 PSI = 200–250 kPa. Check the sticker on the driver-side door jamb or the owner's manual for the exact value.

What is torr and how does it differ from mmHg?

Torr and mmHg are essentially the same: 1 Torr = 133.322 Pa, 1 mmHg = 133.322 Pa. The name "torr" honours Evangelista Torricelli, who first measured atmospheric pressure with a mercury column in 1644. Torr is now considered obsolete; mmHg remains standard in medicine.

How do you convert bar to MPa?

Divide by 10. 1 MPa = 10 bar. Example: 150 bar ÷ 10 = 15 MPa. Reverse: MPa × 10 = bar. This conversion is common in industry — gauges read in bar while technical documentation uses MPa.

What is the difference between gauge pressure and absolute pressure?

Absolute pressure is measured from absolute vacuum (zero). Gauge pressure is measured relative to atmospheric pressure. Formula: P_abs = P_gauge + P_atm. Pressure gauges (manometers) display gauge pressure. Example: tire pressure 2 bar (gauge) = 3.01325 bar absolute.

Pressure Converter — How to Convert Pressure Units Online

Pressure is a physical quantity that describes the force applied perpendicularly per unit area of a surface. The SI unit is the pascal (Pa), but different fields use different units: bar and PSI in engineering and automotive applications, mmHg in medicine, hectopascals in meteorology, MPa and kgf/cm² in industry. Our free online pressure converter enables instant conversion between 14 units without manual calculation.

How to Convert PSI to Bar — Tire Pressure Made Easy

PSI (pound per square inch) is the standard in the USA; bar is the standard in Europe. Formula: bar = PSI × 0.06895. Reverse: PSI = bar × 14.504. Recommended passenger car tire pressure: 2.0–2.5 bar = 29–36 PSI = 200–250 kPa. If your car manual shows 32 PSI, that equals 2.21 bar or 221 kPa. Always measure tire pressure on cold tires — warm tires give a higher reading.

Pascal, Kilopascal, Megapascal — The SI System

1 kPa = 1,000 Pa, 1 MPa = 1,000,000 Pa = 10 bar. Atmospheric pressure = 101.325 kPa. Kilopascals are used in meteorology, pneumatics and medicine. MPa in industry and construction (material strength, operating pressures). To convert bar to MPa: divide by 10. So 150 bar = 15 MPa. For tire pressure: 2.2 bar = 220 kPa = 0.22 MPa.

Millimeter of Mercury and Torr — Medicine and Meteorology

1 mmHg = 133.322 Pa = 0.001333 bar. Torr is a synonym for mmHg, named after Torricelli. Normal atmospheric pressure = 760 mmHg = 101.325 kPa. Blood pressure: normal 120/80 mmHg corresponds to 16.0 / 10.7 kPa. To convert mmHg to kPa: multiply by 0.1333. To convert kPa to mmHg: multiply by 7.5006. Hectopascals (hPa) in meteorology are numerically identical to millibars (mbar).

Bar, Atmosphere, kgf/cm² — Industry and Everyday Use

Three frequently confused units: 1 bar = 100,000 Pa, 1 standard atmosphere (atm) = 101,325 Pa, 1 technical atmosphere (at) = 1 kgf/cm² = 98,066.5 Pa. All three are similar (within 3%) but not equal. Industry in Central and Eastern Europe traditionally uses kgf/cm²; the West uses bar and PSI. Use the pressure converter above for instant, error-free conversion between any of these units.

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