Convert Pounds per Square Inch to Kilopounds per Square Inch
Convert Pounds per Square Inch (psi) to Kilopounds per Square Inch (ksi) instantly and accurately.
Conversion Formula
ksi = psi × 0.001
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 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
| Pounds per Square Inch (psi) | Kilopounds per Square Inch (ksi) |
|---|---|
| 1 psi | 0.001 ksi |
| 2 psi | 0.002 ksi |
| 5 psi | 0.005 ksi |
| 10 psi | 0.01 ksi |
| 25 psi | 0.025 ksi |
| 50 psi | 0.05 ksi |
| 100 psi | 0.1 ksi |