Pressure Reference Sheet
Common units: pascals (Pa), kilopascals (kPa), bar, atm, psi, mmHg, inHg, inH₂O.
Conversions
Metric (SI)
- 1 kilopascal (kPa) = 1,000 Pa
- 1 megapascal (MPa) = 1,000,000 Pa
- 1 bar = 100,000 Pa (= 100 kPa)
- 1 millibar (mbar) = 100 Pa
- 1 atm = 101,325 Pa ≈ 101.325 kPa
U.S. / Imperial
- 1 psi ≈ 6,894.76 Pa
- 1 psf ≈ 47.8803 Pa
- 1 inHg ≈ 3,386.39 Pa
- 1 inH₂O ≈ 249.089 Pa
- 1 torr ≈ 133.322 Pa
- 1 mmHg ≈ 133.322 Pa
U.S. to Metric
- 1 psi ≈ 6.89476 kPa ≈ 0.0689476 bar
- 1 inHg ≈ 3.38639 kPa
- 1 inH₂O ≈ 0.249089 kPa
Metric to U.S.
- 1 kPa ≈ 0.145038 psi
- 1 bar ≈ 14.5038 psi
- 1 atm ≈ 14.6959 psi ≈ 29.92 inHg
Quick benchmarks
- Sea level: 1 atm = 101.325 kPa ≈ 14.696 psi ≈ 760 mmHg ≈ 29.92 inHg
- Typical car tire: 32 psi ≈ 220 kPa
- Scuba tank (filled): 200 bar ≈ 2,900 psi
Common units (in Pa)
| Unit | Symbol | In Pa |
|---|---|---|
| Pascals | Pa | 1 |
| Kilopascals | kPa | 1,000 |
| Megapascals | MPa | 1,000,000 |
| Bar | bar | 100,000 |
| Millibar | mbar | 100 |
| Atmosphere | atm | 101,325 |
| Pounds per square inch | psi | 6,894.757 |
| Pounds per square foot | psf | 47.8803 |
| Torr | torr | 133.322 |
| Millimeters of mercury | mmHg | 133.322 |
| Inches of mercury | inHg | 3,386.389 |
| Inches of water | inH₂O | 249.089 |