Convert Pounds per Square Inch to Hectopascals
Convert Pounds per Square Inch (psi) to Hectopascals (hPa) instantly and accurately.
Conversion Formula
hPa = psi × 68.94757293
About Pounds per Square Inch
One pound per square inch (psi) ≈ 6,894.76 Pa - the dominant pressure unit in US industry and consumer products. Car tyres: 32-36 psi; truck tyres 80-120 psi; bicycle road tyres 80-130 psi. Home water supply: 40-80 psi; residential maximum 80 psi per plumbing code. Compressed air tools: 90-150 psi. Steam autoclave sterilisation: 15-30 psi. The distinction between gauge (psig) and absolute (psia) pressure is critical: gauge pressure is relative to ambient; absolute = gauge + ~14.696 psi. 1 psi = 6,894.76 Pa.
About Hectopascals
A hectopascal (hPa) = 100 Pa = 1 mbar - the WMO-official SI-compatible meteorological pressure unit since 1986, replacing millibar with no numerical change. All modern surface observations (METAR, SYNOP), digital barometers, aviation weather, and weather apps report in hPa. QNH altimeter settings outside North America are in hPa. ICAO standard sea-level pressure is 1013.25 hPa. Continental high-pressure record exceeds 1084 hPa; Typhoon Tip (1979) holds the low record at ~870 hPa. 1 hPa = 100 Pa.
Quick Reference Table
| Pounds per Square Inch (psi) | Hectopascals (hPa) |
|---|---|
| 1 psi | 68.9476 hPa |
| 2 psi | 137.895 hPa |
| 5 psi | 344.738 hPa |
| 10 psi | 689.476 hPa |
| 25 psi | 1723.69 hPa |
| 50 psi | 3447.38 hPa |
| 100 psi | 6894.76 hPa |