Metric pressure
1 kilopascal (kPa) = 1,000 Pa. 1 bar = 100,000 Pa = 100 kPa, very close to 1 atm. Weather reports use hectopascals (hPa) or millibars — they are numerically equal.
Pressure conversion
Convert any pressure,
instantly.
Pascals, bar, psi, atmospheres and mmHg — metric, imperial and scientific units side by side.
bar
14.503774
psi1 bar = 14.503774 psi
Quick to:
1 bar in all units
| Pascals | 100000 | Pa |
| Hectopascals | 1000 | hPa |
| Kilopascals | 100 | kPa |
| Megapascals | 0.1 | MPa |
| Millibar | 1000 | mbar |
| Atmospheres | 0.98692327 | atm |
| Torr | 750.06158 | Torr |
| Millimeters of mercury | 750.06158 | mmHg |
| Inches of mercury | 29.52998 | inHg |
| Pounds per square inch | 14.503774 | psi |
| Kilopounds per square inch | 0.014503774 | ksi |
| Pounds per square foot | 2088.5434 | psf |
About pressure conversion
Pressure is force per unit area. The SI unit is the pascal (Pa = N/m²), but engineering, meteorology and medicine each prefer their own units — bar, psi, atm and mmHg all describe the same physical quantity.
Imperial pressure (psi)
Pounds per square inch dominate US automotive, plumbing and industrial use. 1 psi ≈ 6.895 kPa. Tire pressures, hydraulic systems and gas cylinders are commonly rated in psi or ksi (1,000 psi).
Atmospheres, Torr & mmHg
1 standard atmosphere = 101.325 kPa = 760 Torr = 760 mmHg. Vacuum systems use Torr; blood pressure and barometers use mmHg or inches of mercury (inHg).
Everyday reference points
Sea-level air ≈ 1 atm ≈ 1.013 bar ≈ 14.7 psi. Car tires sit around 30–35 psi (≈ 2.1–2.4 bar). A scuba tank holds ≈ 200 bar (≈ 2,900 psi).
Frequently asked questions
- How many psi are in 1 bar?
- 1 bar equals about 14.5038 psi. 1 psi ≈ 0.0689 bar. Tire pressures often appear in both units.
- What is 1 atmosphere in pascals?
- 1 standard atmosphere (atm) is defined as exactly 101,325 Pa, or 1013.25 hPa / mbar — the typical sea-level air pressure.
- What's the difference between Torr and mmHg?
- They're effectively identical: 1 Torr ≡ 1/760 atm ≈ 133.322 Pa, the same as 1 millimeter of mercury to within a tiny rounding.
- How do I convert kPa to psi?
- Divide kPa by 6.89476. For example, 100 kPa ≈ 14.5 psi. Going the other way, multiply psi by 6.89476 to get kPa.