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ksi to psi Conversion Calculator — Kilopounds to Pounds per sq. inch

Convert ksi (kilopounds-force per square inch) to psi (pounds-force per square inch) — the relationship is exact: 1 ksi = 1000 psi. The calculator also outputs MPa, kPa and bar for quick cross-reference.

ksi

Kilopounds-force per square inch (1 ksi = 1000 psi)
Pounds per square inch (psi)
10,000psi

Exact: 1 ksi = 1000 psi

Megapascals (MPa)
68.9476 MPa
Kilopascals (kPa)
68,947.57 kPa
Bar
689.4757 bar
Pascals (Pa)
68,947,573 Pa
01,5003,0004,5006,0007,5009,00010,50012,0000 psi10,000 psiksi on the psi number line — 1 ksi occupies 1000 psi
Step by step
  1. 1

    The ksi unit equals 1,000 × psi

    The "kilo" prefix means ×1,000 — one ksi = exactly 1,000 psi by definition.
  2. 2

    Multiply by 1,000

    10 × 1,000 = 10,000
Results are estimates for general information only and are not professional advice — always verify important results independently before relying on them. Read the full disclaimer.
Quick answer

How does this calculator work?

1 ksi = 1000 psi exactly (the "k" prefix means ×1000). Multiply ksi by 1000 to get psi, or by 6.895 to get MPa. For example, 50 ksi = 50 000 psi = 344.74 MPa. Enter any ksi value to see all common pressure equivalents instantly.

Formula
psi = ksi × 1000 • MPa = ksi × 6.894757 • bar = ksi × 68.9476
How this is calculated

The prefix "kilo" means one thousand, so the conversion from ksi to psi is always an exact multiplication by 1000 — no approximation is involved. 10 ksi = 10 000 psi, 36 ksi = 36 000 psi, and so on. Both units are US customary / imperial pressure units based on the pound-force (lbf) and the square inch (in²).

ksi appears frequently in structural and civil engineering material standards (ASTM, AISC) for yield strength, ultimate tensile strength, and modulus of elasticity of steels, aluminium alloys, and concrete. For example, ASTM A36 structural steel has a minimum yield of 36 ksi (36 000 psi) and structural concrete typically has a compressive strength of 3–5 ksi (3000–5000 psi).

For international work or SI-based standards, this calculator also converts to megapascals using the exact factor 1 ksi = 6.894757293168 MPa, derived from the defined pound-force and inch. The same exact factor underpins all psi-to-Pa conversions in metrology.

Frequently asked questions

Exactly 1000 psi. The "k" in ksi stands for "kilo" (a factor of 1000), just as in kilometre, kilogram, or kilowatt. So ksi is simply a compact way to write thousands of psi.

Structural steels (yield 36–100 ksi), high-strength alloy steels (up to 300 ksi for tool steels), aluminium alloys (30–80 ksi), and concrete compressive strength (3–12 ksi) are commonly quoted in ksi in US engineering practice.

Divide the psi value by 1000. For example, 58 000 psi = 58 ksi. If you have a pressure in MPa, divide by 6.894757 to get ksi, or multiply by 145.038 to get psi directly.

Also known as

ksi to psi converter
kilopounds per square inch to psi
ksi psi conversion factor
stress unit conversion ksi psi
convert ksi to pounds per square inch
ksi psi formula
engineering stress unit psi

APA

TG we-Calculate Editorial Team. (2026). ksi to psi Conversion Calculator — Kilopounds to Pounds per sq. inch [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/ksi-to-psi-conversion-calculator

Chicago

TG we-Calculate Editorial Team. "ksi to psi Conversion Calculator — Kilopounds to Pounds per sq. inch." TG we-Calculate. 2026. https://we-calculate.com/calculator/ksi-to-psi-conversion-calculator.

IEEE

TG we-Calculate Editorial Team, "ksi to psi Conversion Calculator — Kilopounds to Pounds per sq. inch," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/ksi-to-psi-conversion-calculator

BibTeX

@misc{wecalculate_ksi_to_psi_conversion_calculator, title = {ksi to psi Conversion Calculator — Kilopounds to Pounds per sq. inch}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/ksi-to-psi-conversion-calculator}}, year = {2026}, note = {TG we-Calculate} }

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