Pressure converter
Pressure Converter – 13 Units, Exact Factors
1 pound per square inch = 0.068948 bar
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- 1 psi = 0.068948 bar
- 5 psi = 0.34474 bar
- 10 psi = 0.68948 bar
- 25 psi = 1.7237 bar
- PascalsPa
- HectopascalshPa
- KilopascalskPa
- MegapascalsMPa
- Barbar
- Millibarmbar
- Pounds per square inchpsi
- Standard atmospheresatm
- Millimetres of mercurymmHg
- TorrTorr
- Inches of mercury (US)inHg
- Inches of water (US)inH₂O
- Kilograms-force per cm²kgf/cm²
- GigapascalsGPa
- Newtons per square millimetreN/mm²
- Kips per square inch (US)ksi
- Pounds-force per square footlbf/ft²
- Pascals6,894.8Pa
- Hectopascals68.948hPa
- Kilopascals6.8948kPa
- Megapascals0.0068948MPa
- Bar0.068948bar
- Millibar68.948mbar
- Pounds per square inch1psi
- Standard atmospheres0.068046atm
- Millimetres of mercury51.715mmHg
- Torr51.715Torr
- Inches of mercury (US)2.036inHg
- Inches of water (US)27.68inH₂O
- Kilograms-force per cm²0.070307kgf/cm²
- Gigapascals0.0000068948GPa
- Newtons per square millimetre0.0068948N/mm²
- Kips per square inch (US)0.001ksi
- Pounds-force per square foot144lbf/ft²
About pressure conversions
Tyre, weather, blood and hydraulic pressures. Gauge vs absolute pressure is not converted here: both sides use the same reference.
Common pressure conversions
Pressure units explained
| Unit | System | Definition and notes |
|---|---|---|
| Pascal (Pa) | SI (metric) | Base unitThe SI unit of pressure: one newton of force on one square metre. |
| Hectopascal (hPa) | SI (metric) | 1 hPa = 100 Pa (exact)100 Pa; numerically equal to a millibar. Used in weather reports. |
| Kilopascal (kPa) | SI (metric) | 1 kPa = 1,000 Pa (exact) |
| Megapascal (MPa) | SI (metric) | 1 MPa = 1,000,000 Pa (exact) |
| Bar (bar) | metric (non-SI) | 1 bar = 100,000 Pa (exact)Defined as exactly 100,000 Pa. |
| Millibar (mbar) | metric (non-SI) | 1 mbar = 100 Pa (exact) |
| Pound per square inch (psi) | US & imperial (identical) | 1 psi ≈ 6,894.7573 PaPounds of force per square inch, about 6,894.757 Pa. Common for tyres and gauges in the US. |
| Standard atmosphere (atm) | other | 1 atm = 101,325 Pa (exact)Defined as exactly 101,325 Pa. |
| Millimetre of mercury (mmHg) | other | 1 mmHg = 133.322387415 Pa (exact)Millimetres of mercury, fixed at 133.322387415 Pa. Used for blood pressure. |
| Torr (Torr) | other | 1 Torr ≈ 133.32237 PaExactly 1/760 of a standard atmosphere. Very close to, but not quite, 1 mmHg. |
| Inch of mercury (inHg) | US customary | 1 inHg ≈ 3,386.3886 PaInches of mercury (25.4 mmHg), about 3,386.389 Pa. Used in US weather reports and aviation. |
| Inch of water (inH₂O) | US customary | 1 inH₂O = 249.08891 Pa (exact)Inches of water, fixed at 249.08891 Pa. Used for low pressures such as ducts and gas lines. |
| Kilogram-force per cm² (kgf/cm²) | other | 1 kgf/cm² = 98,066.5 Pa (exact) |
| Gigapascal (GPa) | SI (metric) | 1 GPa = 1,000,000,000 Pa (exact)Defined as exactly 10⁹ Pa. Used for elastic moduli (steel is about 200 GPa). |
| Newton per square millimetre (N/mm²) | SI (metric) | 1 N/mm² = 1,000,000 Pa (exact)Defined as exactly 1 MPa. Common in European structural codes (Eurocode). |
| Kip per square inch (ksi) | US customary | 1 ksi ≈ 6,894,757.3 PaA thousand psi, about 6.8948 MPa. Used for material strength in US practice. |
| Pound-force per square foot (lbf/ft²) | US & imperial (identical) | 1 lbf/ft² ≈ 47.880259 PaPounds of force per square foot, about 47.88 Pa. Used for wind, snow and floor loads. |
Pounds per square inch to bar conversion table
| Pounds per square inch (psi) | Bar (bar) |
|---|---|
| 0.1 psi | 0.0068948 bar |
| 0.5 psi | 0.034474 bar |
| 1 psi | 0.068948 bar |
| 2 psi | 0.1379 bar |
| 3 psi | 0.20684 bar |
| 4 psi | 0.27579 bar |
| 5 psi | 0.34474 bar |
| 6 psi | 0.41369 bar |
| 7 psi | 0.48263 bar |
| 8 psi | 0.55158 bar |
| 9 psi | 0.62053 bar |
| 10 psi | 0.68948 bar |
| 15 psi | 1.0342 bar |
| 20 psi | 1.379 bar |
| 25 psi | 1.7237 bar |
| 30 psi | 2.0684 bar |
| 40 psi | 2.7579 bar |
| 50 psi | 3.4474 bar |
| 75 psi | 5.1711 bar |
| 100 psi | 6.8948 bar |
| 250 psi | 17.237 bar |
| 500 psi | 34.474 bar |
| 1,000 psi | 68.948 bar |
Frequently asked questions
Which pressure units can I convert?
pascals (Pa), hectopascals (hPa), kilopascals (kPa), megapascals (MPa), bar (bar), millibar (mbar), pounds per square inch (psi), standard atmospheres (atm), millimetres of mercury (mmHg), torr (Torr), inches of mercury (inHg), inches of water (inH₂O), kilograms-force per cm² (kgf/cm²).
How accurate are the results?
Every unit is stored with its exact defining factor (NIST SP 811, NIST Handbook 44 or the BIPM SI Brochure). Calculations use double-precision arithmetic and are rounded only for display, to 5 significant figures by default (trailing zeros dropped, so 1 km shows as 1000 m). You can choose Auto (up to 10 digits), fixed decimals or more significant figures, or switch to scientific or engineering notation.