Pressure Converter

Q: How to convert PSI to bar?

To convert PSI to bar, multiply by 0.0689476. Example: 32 PSI x 0.0689476 = 2.206 bar. To convert bar to PSI, multiply by 14.5038. Example: 2.2 bar x 14.5038 = 31.9 PSI. Type any value in the PSI field above and all units update instantly.

Q: How to convert bar to PSI?

To convert bar to PSI, multiply by 14.5038. Example: 2 bar x 14.5038 = 29.01 PSI. To convert PSI to bar, multiply by 0.0689476. Example: 30 PSI x 0.0689476 = 2.068 bar. One bar is approximately 14.5 PSI — a useful approximation for everyday conversions.

Q: How to convert kPa to PSI?

To convert kilopascals to PSI, multiply by 0.145038. Example: 200 kPa x 0.145038 = 29.01 PSI. To convert PSI to kPa, multiply by 6.89476. Example: 32 PSI x 6.89476 = 220.6 kPa. Tyre pressure: 32 PSI = 220.6 kPa = 2.206 bar.

Q: What is 1 bar in PSI?

1 bar equals 14.5038 PSI. More precisely, 1 bar = 100,000 Pa, and 1 PSI = 6,894.757 Pa, so 1 bar / 6,894.757 = 14.5038 PSI. For quick mental maths: 1 bar is approximately 14.5 PSI.

Q: How to convert MPa to PSI?

To convert MPa to PSI, multiply by 145.038. Example: 1 MPa x 145.038 = 145.04 PSI. To convert PSI to MPa, multiply by 0.00689476. Example: 1000 PSI x 0.00689476 = 6.895 MPa. 1 MPa = 10 bar exactly. Common applications: hydraulic systems (10-40 MPa), concrete strength (20-50 MPa), tyre pressure (~0.22-0.25 MPa).

Q: What is tyre pressure in bar and PSI?

Standard car tyre pressure is 2.1-2.5 bar (30-36 PSI, 207-241 kPa). The door jamb sticker on your car shows the recommended pressure. Road bicycle tyres typically run at 6-9 bar (87-130 PSI). Mountain bike tyres: 1.5-3 bar (22-44 PSI). Truck tyres: 7-10 bar (100-145 PSI). Always check cold tyre pressure as pressure increases with temperature.

Q: How to convert Pa to bar?

To convert Pascals to bar, divide by 100,000 (or multiply by 0.00001). Example: 101,325 Pa / 100,000 = 1.01325 bar (standard atmosphere). To convert bar to Pa, multiply by 100,000. Example: 2.5 bar x 100,000 = 250,000 Pa.

Q: What is standard atmospheric pressure in different units?

1 standard atmosphere (1 atm) equals: 101,325 Pa, 101.325 kPa, 0.101325 MPa, 1.01325 bar, 1013.25 mbar (hPa), 14.6959 PSI, 760 mmHg (Torr), 29.921 inHg, 10.332 mH2O. Load the Standard atm preset above to see all conversions simultaneously.

Q: Pressure converter online free

Type any pressure value in any of 14 units — Pa, kPa, MPa, bar, PSI, atm, Torr, inHg, and more — and all other units update instantly. Real-world context panel, visual pressure gauge, comparison table, 6 presets. Free, no account, browser-side.

Q: How to convert bar to kPa?

To convert bar to kPa, multiply by 100. Example: 2.5 bar x 100 = 250 kPa. This is exact because 1 bar = 100,000 Pa = 100 kPa by definition. To convert kPa to bar, divide by 100.

What Is Pressure?

Pressure Units Explained — Pa, Bar, PSI, atm, Torr & More

Pressure is the force applied perpendicular to a surface per unit area: P = F / A. The SI unit is the Pascal (Pa), defined as one Newton per square metre. Because 1 Pa is extremely small — roughly the weight of a bank note resting on a table — engineers, meteorologists, and medical professionals use multiples and alternative units that give conveniently sized numbers for their application domain. A tyre inflated to 32 PSI is 220,600 Pa, which is awkward; 2.2 bar or 32 psi are both more convenient expressions of the same physical reality.

Why so many pressure units?

🌍

Pascal (Pa) — SI base unit, universal in science — Adopted internationally in 1971 as part of the SI system. Because 1 Pa is tiny, technical work uses kPa (kilopascals, 1000 Pa), MPa (megapascals, 10⁶ Pa), and GPa (gigapascals, 10⁹ Pa). Material science reports yield strength in MPa. Civil engineering specifies concrete compressive strength in MPa. Thermodynamics uses kPa. Physics uses Pa. The universality of Pascal makes it the base unit in every pressure converter including this one.

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Bar — European standard for many industrial applications — Exactly 100,000 Pa. Very close to atmospheric pressure (1 atm = 1.01325 bar), making it convenient for tyre pressures, diving equipment, HVAC systems, and European industrial standards. 1 MPa = 10 bar exactly — a convenient relationship. Bar is used for tyre pressure labelling in Europe, and in weather maps in some regions (where millibar = hPa is standard).

🇺🇸

PSI (Pounds per Square Inch) — US and UK engineering standard — Defined as one pound-force per square inch: 1 psi = 6,894.76 Pa. Dominant in US automotive (tyre pressure, brake systems), HVAC, natural gas distribution, and hydraulics. American engineering standards (ASME, ASTM) specify pressures in psi. KSI (kilopounds per square inch) is used for structural steel and high-pressure systems where psi values would be in the tens of thousands.

⛅

Millibar / hPa — meteorology worldwide — 1 mbar = 1 hPa = 100 Pa. Standard sea-level atmospheric pressure is 1013.25 mbar = 1013.25 hPa. Weather forecasts report barometric pressure in hPa (or mbar). Low pressure systems typically read below 1000 hPa; high pressure above 1020 hPa. The World Meteorological Organization adopted hPa as the official SI unit to replace mbar in weather reporting.

❤️

Torr / mmHg — medicine and vacuum technology — Named after Evangelista Torricelli (mercury barometer inventor). 1 Torr ≈ 1 mmHg = 133.322 Pa. Blood pressure is universally measured in mmHg: normal systolic is 120 mmHg (15.999 kPa, 2.32 PSI). Vacuum systems use Torr, mTorr, or Pa depending on the vacuum level. Ophthalmology measures intraocular pressure in mmHg.

✈️

inHg (inches of mercury) — aviation and US weather — 1 inHg = 3,386.39 Pa. Used for altimeter settings in aviation — pilots set their altimeters in inHg in the US/Canada and hPa in Europe. Standard altimeter setting at sea level: 29.92 inHg = 1013.25 hPa. The aircraft cabin altitude is maintained around 6,000–8,000 ft equivalent pressure.

Conversion Reference

Pressure Conversion Table — PSI to Bar, kPa, MPa, atm

Common pressure values in all major units. Use the converter above for any value.

PSI	bar	kPa	MPa	atm	Common use
0.145	0.01	1	0.001	0.00987	Reference unit (1 kPa)
1	0.0689	6.895	0.006895	0.06805	Very low pressure
14.696	1.01325	101.325	0.101325	1.000	Standard atmosphere
30	2.068	206.8	0.2068	2.040	Small car tyre (low end)
32	2.206	220.6	0.2206	2.177	Car tyre (typical, 2.2 bar)
36	2.482	248.2	0.2482	2.450	Car tyre (high end)
100	6.895	689.5	0.6895	6.805	Road bike tyre (7 bar)
145	10.00	1,000	1.000	9.869	1 MPa / 10 bar
1,450	100.0	10,000	10.00	98.69	Hydraulic system (100 bar)
2,901	200.0	20,000	20.00	197.4	Scuba tank (200 bar)
4,351	300.0	30,000	30.00	296.0	Concrete compressive strength
145,038	10,000	1,000,000	1,000	9,869	1 GPa (ultra high pressure)

Key conversion factors (exact or NIST-precise)

From	To Pa	To bar	To PSI	Note
1 Pa	—	0.00001	0.000145038	SI base unit
1 kPa	1,000	0.01	0.145038	Common in HVAC, tyre
1 MPa	1,000,000	10 (exact)	145.038	10 bar exactly
1 bar	100,000 (exact)	—	14.5038	Approx 1 atm
1 atm	101,325 (exact)	1.01325	14.6959	Sea-level reference
1 PSI	6,894.757	0.0689476	—	NIST precise value
1 Torr (mmHg)	133.322	0.00133322	0.019337	Blood pressure unit
1 inHg	3,386.39	0.033864	0.491154	Aviation altimeter
1 kgf/cm²	98,066.5	0.980665	14.2233	Technical atmosphere

Applications

Pressure Units by Application — Which Unit to Use When

🚗

Tyre pressure — PSI (US/UK), bar (Europe), kPa (Australia/Asia) — Car tyres: 30–36 PSI (2.1–2.5 bar, 207–241 kPa). Always check cold tyre pressure as pressure rises 0.1–0.2 bar (1.5–3 PSI) when hot. Tyre sidewalls show maximum pressure (NOT recommended pressure — use the car door jamb sticker). Road bikes: 6–9 bar (87–130 PSI). Mountain bikes: 1.5–3 bar (22–44 PSI). Run tubeless tyres at slightly lower pressure than tubes.

⚙️

Hydraulics and industrial — bar (Europe), PSI (USA), MPa (international engineering) — Industrial hydraulic systems: 100–400 bar (1,450–5,800 PSI). Mobile hydraulics (excavators, cranes): 200–350 bar. Pneumatic systems: 5–10 bar (72–145 PSI). ASME pressure vessel codes use PSI. EN/ISO standards use bar or MPa. Always verify whether a spec is gauge pressure (relative to atmosphere) or absolute pressure (relative to vacuum).

⛅

Meteorology — hPa or mbar — Standard sea level: 1013.25 hPa. Low pressure (storm): below 980 hPa. High pressure (fair weather): above 1020 hPa. The deepest recorded cyclone pressure was 870 hPa (Super Typhoon Tip, 1979). Weather station apps report in hPa or mbar. Aviation uses inHg in North America and hPa elsewhere for altimeter setting.

🏗️

Structural engineering — MPa or ksi — Concrete compressive strength: 20–50 MPa (2,900–7,250 PSI). Structural steel yield strength: 250–690 MPa (36–100 ksi). Rebar tensile strength: 400–700 MPa. Young’s modulus of steel: ~200 GPa. US structural engineers use ksi (kilopounds per square inch); European and ISO standards use MPa. 1 ksi = 1,000 psi = 6.895 MPa.

🤿

Scuba diving — bar (Europe), PSI (USA) — Scuba tank fill pressure: 200–300 bar (2,900–4,350 PSI). Underwater pressure increases by 1 bar (14.5 PSI) per 10 metres depth. At 30 metres depth: 4 bar absolute (3 bar water + 1 bar atmospheric). Dive computers and gauges display bar or PSI depending on region. Oxygen partial pressure limits for diving: 1.4–1.6 bar PO2.

❤️

Medicine — mmHg (Torr) — Blood pressure: normal systolic 120 mmHg, normal diastolic 80 mmHg. Hypertension: systolic above 140 mmHg. Intraocular pressure: normal 10–21 mmHg. Intracranial pressure: normal 5–15 mmHg. Pulmonary artery pressure: normal systolic 18–25 mmHg. The unit mmHg is so entrenched in medicine that metrication has not displaced it despite SI standardisation.

Gauge vs Absolute

Gauge Pressure vs Absolute Pressure — The Critical Distinction

Most pressure gauges read gauge pressure (relative to atmosphere). When precision matters — thermodynamics, altitude calculations, vacuum systems — absolute pressure is required.

Measurement	Gauge (PSIG / barg)	Absolute (PSIA / bara)	Notes
Car tyre	32 PSIG / 2.2 barg	46.7 PSIA / 3.2 bara	Gauge reads 0 at atmospheric
Perfect vacuum	-14.7 PSIG / -1.013 barg	0 PSIA / 0 bara	Absolute zero = perfect vacuum
Standard atmosphere	0 PSIG / 0 barg	14.696 PSIA / 1.01325 bara	Ambient = 0 gauge by definition
Hydraulic system (200 barg)	200 barg / 2,901 PSIG	201 bara / 2,916 PSIA	+1 bara offset from atmosphere

This converter calculates absolute pressure. To convert gauge to absolute: add 1 atm (101.325 kPa / 14.696 PSI / 1.01325 bar). To convert absolute to gauge: subtract 1 atm.

Comparison

LazyTools vs Other Pressure Converters

Feature	LazyTools	MonoCalc	MiniWebtool	Kongfang Metal
Bidirectional (type any unit)	✅ All 14 units	✅ 15 units	⚠ Select-based	⚠ 5 units
Visual pressure gauge	✅ Animated SVG	❌ No	⚠ Static visual	❌ No
Real-world context panel	✅ 12 references	❌ No	⚠ Presets only	❌ No
Application presets	✅ 6 presets	❌ No	✅ Yes	❌ No
Comparison table	✅ 7 multiples, live	❌ No	❌ No	❌ No
Unit grouping by domain	✅ SI/Atm/Eng/Vac	✅ Grouped	❌ Flat list	❌ Flat list
No account required	✅ Yes	✅ Yes	⚠ Ads	✅ Yes

FAQ

Pressure Conversion FAQ

How to convert PSI to bar?▾

Multiply PSI by 0.0689476. Example: 32 PSI × 0.0689476 = 2.206 bar. Quick estimate: 1 bar ≈ 14.5 PSI. Type any PSI value in the field above for instant conversion.

How to convert bar to PSI?▾

Multiply bar by 14.5038. Example: 2.2 bar × 14.5038 = 31.9 PSI. Quick estimate: bar × 14.5 = PSI.

How to convert kPa to PSI?▾

Multiply kPa by 0.145038. Example: 200 kPa × 0.145038 = 29.01 PSI. To convert PSI to kPa: multiply by 6.89476.

What is 1 bar in PSI?▾

1 bar = 14.5038 PSI. Or approximately 14.5 PSI. 1 bar = 100,000 Pa = 100 kPa = 0.1 MPa exactly.

How to convert MPa to PSI?▾

Multiply MPa by 145.038. Example: 1 MPa × 145.038 = 145.04 PSI. 1 MPa = 10 bar exactly. To convert PSI to MPa: multiply by 0.00689476.

What is tyre pressure in bar and PSI?▾

Car tyres: 2.1–2.5 bar (30–36 PSI, 207–241 kPa). Road bike: 6–9 bar (87–130 PSI). Mountain bike: 1.5–3 bar (22–44 PSI). Always check cold. Pressure rises 0.1–0.2 bar (1.5–3 PSI) when warm.

How to convert Pa to bar?▾

Divide Pa by 100,000 (or multiply by 0.00001). Example: 101,325 Pa / 100,000 = 1.01325 bar. 1 bar = 100,000 Pa exactly.

What is standard atmospheric pressure in different units?▾

1 atm = 101,325 Pa = 101.325 kPa = 1.01325 bar = 1013.25 mbar = 14.696 PSI = 760 Torr/mmHg = 29.921 inHg. Load the "Standard atm" preset above to see all conversions.

Pressure converter online free▾

Type any value in any of 14 pressure units — Pa, kPa, MPa, bar, PSI, atm, Torr, inHg and more — and all others update instantly. Visual gauge, real-world context, comparison table, 6 presets. Free, no account.

How to convert bar to kPa?▾

Multiply bar by 100. This is exact: 1 bar = 100,000 Pa = 100 kPa by definition. To convert kPa to bar: divide by 100.

What is 100 PSI in bar?▾

100 PSI = 6.895 bar = 689.5 kPa = 0.6895 MPa = 6.804 atm.

What is the difference between PSI and PSIg?▾

PSIA (absolute) measures from perfect vacuum. PSIG (gauge) measures from ambient atmosphere. 0 PSIG = 14.696 PSIA. A tyre reading 32 PSIG = 46.7 PSIA. This converter calculates absolute pressure. To convert gauge to absolute: add 14.696 PSI (1 atm).

How to convert atm to PSI?▾

Multiply atm by 14.6959. Example: 3 atm × 14.6959 = 44.09 PSI. 1 atm = 14.696 PSI = 101.325 kPa = 1.01325 bar.

What is Torr and how does it convert?▾

1 Torr = 1 mmHg = 133.322 Pa. Blood pressure (120 mmHg systolic) = 15.999 kPa = 2.32 PSI. 760 Torr = 1 atm = 101.325 kPa = 14.696 PSI.

Bar to PSI conversion chart▾

1 bar = 14.50 PSI. 1.5 bar = 21.76. 2 bar = 29.01. 2.2 bar = 31.91. 2.5 bar = 36.26. 3 bar = 43.51. 5 bar = 72.52. 10 bar = 145.04. 100 bar = 1,450 PSI. 200 bar = 2,901 PSI. Use the converter above for any value.

How to convert inHg to mbar?▾

Multiply inHg by 33.8639. Example: 29.92 inHg × 33.8639 = 1013.25 mbar. Standard atmosphere = 29.92 inHg = 1013.25 hPa/mbar.

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Pressure Converter PSI ⇔ bar ⇔ kPa ⇔ MPa ⇔ atm ⇔ All 14 Units — Live Bidirectional

Type in Any Unit — All 14 Update Instantly

Rate this tool

Pressure Units Explained — Pa, Bar, PSI, atm, Torr & More

Why so many pressure units?

Pressure Conversion Table — PSI to Bar, kPa, MPa, atm

Key conversion factors (exact or NIST-precise)

Pressure Units by Application — Which Unit to Use When

Gauge Pressure vs Absolute Pressure — The Critical Distinction

LazyTools vs Other Pressure Converters

Pressure Conversion FAQ

More Free Converter Tools

Type in Any Unit — All 14 Update Instantly

Pressure unit quick reference

Rate this tool

Pressure Units Explained — Pa, Bar, PSI, atm, Torr & More

Why so many pressure units?

Pressure Conversion Table — PSI to Bar, kPa, MPa, atm

Key conversion factors (exact or NIST-precise)

Pressure Units by Application — Which Unit to Use When

Gauge Pressure vs Absolute Pressure — The Critical Distinction

LazyTools vs Other Pressure Converters

Pressure Conversion FAQ

More Free Converter Tools