Convert Hectopascals to Kilopounds per Square Inch
Convert Hectopascals (hPa) to Kilopounds per Square Inch (ksi) instantly and accurately.
Conversion Formula
ksi = hPa × 1.450377377e-5
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.
About Kilopounds per Square Inch
One ksi (kilopound per square inch) = 1,000 psi ≈ 6.895 MPa - the standard engineering stress unit in the US. ASTM A36 structural steel: 36 ksi yield, 58-80 ksi tensile. ASTM A325 high-strength bolts: 92 ksi proof load. AISC steel construction tables, FAA/MIL-SPEC aerospace allowables, and ASME Section VIII pressure vessel design all use ksi. Fracture toughness (K_IC) for steels: 50-200 ksi·√in. Convenient because it keeps large structural stresses as manageable 3-digit numbers. 1 ksi = 6.895 MPa.
Quick Reference Table
| Hectopascals (hPa) | Kilopounds per Square Inch (ksi) |
|---|---|
| 1 hPa | 1.45 × 10-5 ksi |
| 2 hPa | 2.901 × 10-5 ksi |
| 5 hPa | 7.252 × 10-5 ksi |
| 10 hPa | 0.000145038 ksi |
| 25 hPa | 0.000362594 ksi |
| 50 hPa | 0.000725189 ksi |
| 100 hPa | 0.00145038 ksi |