ksi to MPa Conversion Calculator — Kilopounds per sq. inch to Megapascals
Enter a pressure or stress value in ksi (kilopounds-force per square inch) and get the equivalent in MPa (megapascals), plus GPa, kPa, bar and psi — the exact factor is 1 ksi = 6.894757 MPa.
ksi
1 ksi = 6.894757 MPa exactly (derived from the exact definition of the pound-force)
- 1
Convert ksi to psi
100 × 1,000 = 100,000 - 2
Convert psi to Pascals
100,000 × 6,894.757 = 689,475,729.32 - 3
Convert Pa to MPa
689,475,729.32 ÷ 1,000,000 = 689.4757
How does this calculator work?
Multiply ksi by 6.894757 to get MPa (1 ksi = 1000 psi = 6.894757 MPa). This exact factor comes from the defined values of the pound-force and the inch. For reverse conversion divide MPa by 6.895. Enter any ksi value to see MPa, GPa, kPa, bar and psi equivalents instantly.
Formula
How this is calculated
The kilopound-force per square inch (ksi or kip/in²) is a common unit in structural and mechanical engineering, particularly in US practice, where material yield strength and ultimate tensile strength are reported in ksi (for example structural steel has a yield strength of 36–50 ksi). The megapascal (MPa) is the SI equivalent used in most of the rest of the world for the same quantities.
The conversion is derived from two exact definitions: the pound-force (1 lbf = 0.45359237 kg × 9.80665 m/s² = 4.4482216152605 N, exactly) and the inch (1 in = 0.0254 m, exactly). One psi is therefore 1 lbf/in² = 4.4482216152605 N / (0.0254 m)² = 6894.757293168 Pa exactly, so 1 ksi = 1000 psi = 6.894757293168 MPa.
This calculator also outputs GPa (for very high-strength materials such as ceramics or composites), kPa, bar and psi, covering all the pressure units commonly encountered in engineering data sheets and material standards.
Frequently asked questions
Exactly 1 ksi = 6.894757293168 MPa, derived from the exact definition of the pound-force and the inch. For quick mental arithmetic, 1 ksi ≈ 6.895 MPa or roughly 7 MPa.
Material strengths in US engineering practice run into tens of thousands of psi, so ksi (1000 psi) keeps the numbers compact and readable. A steel yield strength of 36 000 psi is simply 36 ksi — just as MPa serves the same purpose in SI practice.
Divide the MPa value by 6.894757: ksi = MPa / 6.894757. For example, 250 MPa ÷ 6.895 ≈ 36.3 ksi, a typical structural steel yield strength.
Also known as
TG we-Calculate Editorial Team. (2026). ksi to MPa Conversion Calculator — Kilopounds per sq. inch to Megapascals [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/ksi-to-mpa-conversion-calculator
TG we-Calculate Editorial Team. "ksi to MPa Conversion Calculator — Kilopounds per sq. inch to Megapascals." TG we-Calculate. 2026. https://we-calculate.com/calculator/ksi-to-mpa-conversion-calculator.
TG we-Calculate Editorial Team, "ksi to MPa Conversion Calculator — Kilopounds per sq. inch to Megapascals," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/ksi-to-mpa-conversion-calculator
@misc{wecalculate_ksi_to_mpa_conversion_calculator, title = {ksi to MPa Conversion Calculator — Kilopounds per sq. inch to Megapascals}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/ksi-to-mpa-conversion-calculator}}, year = {2026}, note = {TG we-Calculate} }
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