Convert ksi to Gigapascals (ksi to GPa)

Formula

GPa = ksi × 0.006894757293168

or GPa = ksi ÷ 145.0377377302

Derivation from SI units:

• 1 ksi = 1000 psi = 1 kip/in² = 6.894757293168 MPa
• 1 GPa = 10⁹ Pa = 1000 MPa = 1 kN/mm²
• 1 ksi = 6894757.293168 Pa ÷ 1000000000 Pa per GPa = 0.006894757293168 GPa

Both units are defined exactly, so the factor is exact. ksi definition: ksi; Gigapascal definition: gigapascal.

Worked examples

1. A reading of 20 ksi converts to 0.1378951459 GPa.
   20 ksi × 0.006894757293 = 0.1378951459 GPa
2. A value of 65 ksi is 0.4481592241 GPa.
   65 ksi × 0.006894757293 = 0.4481592241 GPa

Where it's used

ksi are used for yield and tensile strength in ASTM and ASME material specifications, while gigapascals appear in young's modulus and shear modulus of metals, ceramics and composites. Both measure pressure, stress and differential pressure (force per unit area), so the conversion is a fixed factor.

ksi to other pressure units

Frequently asked questions

Sources

• Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "kip per square inch (ksi)".
• The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 7, SI prefixes.

Last reviewed: 2026-10-15. Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.