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Kilopound per Square Inch (ksi) - Unit Information & Conversion

Symbol:ksi
Plural:kilopounds per square inch
Category:Pressure

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What is a Kilopound per Square Inch?

Kilopound per square inch (ksi) = 1,000 PSI. Used in US structural engineering, material strength specifications. 1 ksi = 6.895 MPa = 68.95 bar. Steel yield: 36-50 ksi. Concrete: 3-10 ksi. Convenient for high-pressure engineering.

History of the Kilopound per Square Inch

US engineering unit for material strength since mid-1900s. Thousand-PSI more convenient than tens of thousands PSI. Standard in AISC (steel), ACI (concrete) specifications. Still primary unit in US construction despite SI adoption elsewhere.

Quick Answer

What is ksi? Kilopound per square inch (ksi) = 1,000 PSI. Standard in US structural engineering for material strength. 1 ksi = 6.895 MPa. Steel yield strength: 36-50 ksi. Concrete strength: 3-10 ksi. High-pressure hydraulics. Use our pressure converter for conversions.

Definition

1 ksi = 1,000 PSI = 6.895 MPa = 68.95 bar = 6,895 kPa = 47.88 atm

ksi = kilo-pound per square inch = 1,000 pounds-force per square inch

Also written as: KSI, 1000 PSI, 1 KPSI

Common Uses

Structural Steel: Yield strength, tensile strength specifications (AISC standards). Concrete: Compressive strength testing, design specs. Materials Testing: Tensile testing, compression testing. High-Pressure Systems: Hydraulics, pressure vessels, extreme pressures.

Real-World Examples

Structural Steel Strength

  • A36 structural steel: 36 ksi yield strength
  • A572 Grade 50: 50 ksi yield strength
  • A992 (common): 50 ksi yield, 65 ksi tensile
  • High-strength steel: 70-100 ksi
  • Rebar (Grade 60): 60 ksi yield
  • Prestressing strand: 270 ksi tensile

Concrete Compressive Strength

  • Residential slab: 3-4 ksi (3,000-4,000 PSI)
  • Commercial floor: 4-5 ksi
  • Structural columns: 5-8 ksi
  • High-rise buildings: 8-14 ksi
  • Bridge decks: 4-6 ksi
  • Ultra-high performance: 20-30 ksi

Material Tensile Strength

  • Aluminum 6061-T6: 45 ksi tensile
  • Stainless 304: 75 ksi tensile
  • Tool steel: 200-400 ksi
  • Titanium alloy: 130-170 ksi
  • Carbon fiber composite: 500+ ksi
  • Piano wire: 400+ ksi

High-Pressure Applications

  • Water jet cutter: 40-90 ksi (ultra-high pressure)
  • Pressure vessel design: 10-30 ksi
  • Deep sea submersible: 15-20 ksi (hull strength)
  • Hydraulic intensifier: 30-60 ksi
  • Diamond anvil cell: 1,000+ ksi (research)

Bolt Strength Grades

  • Grade 2 bolt: 60 ksi tensile
  • Grade 5 bolt: 120 ksi tensile
  • Grade 8 bolt: 150 ksi tensile
  • A325 structural bolt: 120 ksi tensile
  • A490 high-strength: 150 ksi tensile

Kilopound per Square Inch Conversion Formulas

To Pascal:

1 ksi = 6894757.293168 Pa
Example: 5 kilopounds per square inch = 34473786.46584 pascals

To Kilopascal:

1 ksi = 6894.757293 kPa
Example: 5 kilopounds per square inch = 34473.786466 kilopascals

To Megapascal:

1 ksi = 6.894757 MPa
Example: 5 kilopounds per square inch = 34.473786 megapascals

To Hectopascal:

1 ksi = 68947.572932 hPa
Example: 5 kilopounds per square inch = 344737.864658 hectopascals

To Bar:

1 ksi = 68.947573 bar
Example: 5 kilopounds per square inch = 344.737865 bars

To Millibar:

1 ksi = 68947.572932 mbar
Example: 5 kilopounds per square inch = 344737.864658 millibars

To Atmosphere:

1 ksi = 68.045964 atm
Example: 5 kilopounds per square inch = 340.22982 atmospheres

To Technical Atmosphere:

1 ksi = 70.306958 at
Example: 5 kilopounds per square inch = 351.53479 technical atmospheres

To Torr:

1 ksi = 51714.932572 Torr
Example: 5 kilopounds per square inch = 258574.662858 torr

To Millimeter of Mercury:

1 ksi = 51714.932572 mmHg
Example: 5 kilopounds per square inch = 258574.662858 millimeters of mercury

To Inch of Mercury:

1 ksi = 2036.020461 inHg
Example: 5 kilopounds per square inch = 10180.102305 inches of mercury

To Pound per Square Inch:

1 ksi = 1000 psi
Example: 5 kilopounds per square inch = 5000 pounds per square inch

To Kilogram-force per Square Centimeter:

1 ksi = 70.306958 kgf/cm²
Example: 5 kilopounds per square inch = 351.53479 kilograms-force per square centimeter

To Kilogram-force per Square Meter:

1 ksi = 703069.579639 kgf/m²
Example: 5 kilopounds per square inch = 3515347.898196 kilograms-force per square meter

To Millimeter of Water Column:

1 ksi = 703069.579639 mmH₂O
Example: 5 kilopounds per square inch = 3515347.898196 millimeters of water column

To Inch of Water Column:

1 ksi = 27679.904895 inH₂O
Example: 5 kilopounds per square inch = 138399.524477 inches of water column

Frequently Asked Questions

Formula: MPa = ksi × 6.895 Examples:

  • 36 ksi = 248 MPa (A36 steel)
  • 50 ksi = 345 MPa (A992 steel)
  • 60 ksi = 414 MPa (rebar)
  • 100 ksi = 689 MPa (high-strength)
  • 1 ksi = 6.895 MPa ksi to MPa converter →

Convert Kilopound per Square Inch

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Kilopound per Square Inch Quick Info

ksi
Symbol:ksi
Category:Pressure
System:Various
Convert Kilopound per Square Inch

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