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Multiple conversions
To convert from kilopound per square inch (ksi) to pascal (Pa), use the following formula:
pascal (Pa)
= 10.00014503768078 × 1000× kilopound per square inch (ksi)
= 6894760.0004501395751× kilopound per square inch (ksi)
With 10.00014503768078 is the ratio between the base units kilopascal (kPa) and kilopound per square inch (ksi).
To convert from kilopound per square inch (ksi) to kilopascal (kPa), use the following formula:
kilopascal (kPa)
= 10.00014503768078× kilopound per square inch (ksi)
= 6894.7600004501395751× kilopound per square inch (ksi)
With 10.00014503768078 is the ratio between the base units kilopascal (kPa) and kilopound per square inch (ksi).
To convert a stress from kilopounds per square inch (ksi) to megapascals (MPa), multiply by 6.8948.
One ksi is 1,000 psi, and one psi is 6,894.76 Pa, so one ksi is 6.89476 MPa exactly (to six figures). A rougher but memorable anchor: 1 ksi ≈ 7 MPa, good to within 1.5% for quick checks.
A US material certificate lists a bolt's minimum tensile strength as 120 ksi, and a European design calculation needs it in MPa:
At 827 MPa, the bolt slots neatly into the metric property class 8.8 territory (nominal 800 MPa) — the two specifications are describing near-identical steel.
| ksi | MPa |
|---|---|
| 1 | 6.89 |
| 36 | 248 |
| 50 | 345 |
| 75 | 517 |
| 120 | 827 |
| 300 | 2,068 |
Ksi-to-MPa is the everyday translation of materials engineering, because the world's two dominant specification systems price strength in different currencies: ASTM and SAE standards quote yield and tensile strengths in ksi (A36 steel yields at 36 ksi, aerospace 4340 tempers to 150–260 ksi), while EN, ISO and JIS standards — and every scientific paper — use MPa (S355 yields at 355 MPa, the same 4340 range reads 1,034–1,793 MPa). Any project mixing American materials with metric design codes, or vice versa, performs this multiplication constantly: qualifying a substitute alloy, checking an imported fastener against Eurocode capacity formulas, or reconciling a US mill certificate with a metric FEA model. Fatigue and fracture work adds a wrinkle — stress-intensity factors convert as ksi·√in × 1.0989 = MPa·√m, a different factor that is routinely misapplied as 6.89. The saving habit is the sanity anchor: ordinary structural steels live at 36–50 ksi and 250–350 MPa. A conversion that lands a mild steel at 2,400 MPa (or 5 ksi) has slipped a unit, and the anchor catches it before the calculation propagates.
To convert from kilopound per square inch (ksi) to hectopascal (hPa), use the following formula:
hectopascal (hPa)
= 10.00014503768078 × 10× kilopound per square inch (ksi)
= 68947.600004501395751× kilopound per square inch (ksi)
With 10.00014503768078 is the ratio between the base units kilopascal (kPa) and kilopound per square inch (ksi).
To convert from kilopound per square inch (ksi) to millibar (mbar), use the following formula:
millibar (mbar)
= 10.00014503768078 × 10× kilopound per square inch (ksi)
= 68947.600004501395751× kilopound per square inch (ksi)
With 10.00014503768078 is the ratio between the base units kilopascal (kPa) and kilopound per square inch (ksi).
To convert from kilopound per square inch (ksi) to bar (bar), use the following formula:
bar (bar)
= 10.00014503768078 × 1100× kilopound per square inch (ksi)
= 68.947600004501395751× kilopound per square inch (ksi)
With 10.00014503768078 is the ratio between the base units kilopascal (kPa) and kilopound per square inch (ksi).
To convert from kilopound per square inch (ksi) to torr (torr), use the following formula:
torr (torr)
= 10.00014503768078 × 760000101325× kilopound per square inch (ksi)
= 51714.952877790338782× kilopound per square inch (ksi)
With 10.00014503768078 is the ratio between the base units kilopascal (kPa) and kilopound per square inch (ksi).
To convert from kilopound per square inch (ksi) to meter of water @ 4°C (mH2O), use the following formula:
meter of water @ 4°C (mH2O)
= 10.00014503768078 × 19.80665× kilopound per square inch (ksi)
= 703.06985570507151526× kilopound per square inch (ksi)
With 10.00014503768078 is the ratio between the base units kilopascal (kPa) and kilopound per square inch (ksi).
To convert from kilopound per square inch (ksi) to millimeter of mercury (mmHg), use the following formula:
millimeter of mercury (mmHg)
= 10.00014503768078 × 10.133322× kilopound per square inch (ksi)
= 51715.095786517900835× kilopound per square inch (ksi)
With 10.00014503768078 is the ratio between the base units kilopascal (kPa) and kilopound per square inch (ksi).
To convert from kilopound per square inch (ksi) to pound per square inch (psi), use the following formula:
pound per square inch (psi)
= 1000× kilopound per square inch (ksi)
To convert from kilopound per square inch (ksi) to Inch of mercury (inHg), use the following formula:
Inch of mercury (inHg)
= 10.000491154× kilopound per square inch (ksi)
= 2036.0212886385940051× kilopound per square inch (ksi)
A kilopound per square inch (ksi) is a unit of pressure and stress used in the Imperial and US customary systems of measurement.
It represents a force of one thousand pounds-force applied to an area of one square inch.
A kilopound per square inch (ksi) is a scaled unit directly related to the more common pound per square inch (psi). The prefix "kilo-" signifies one thousand.
Here are the most common conversions:
The conversion to megapascals (MPa) is essential for converting measurements to the SI (metric) system.
In materials science and structural engineering, ksi is a primary unit for quantifying the mechanical properties and material strength of a substance.
It is commonly used to express:
For example, the strength of high-performance materials like structural steel and aluminum alloys is frequently specified in ksi.
This provides engineers with the critical data needed for safe and reliable design.
While the metric system's megapascal (MPa) is the international standard, ksi remains prevalent in American engineering, particularly in the aerospace, automotive, and construction industries.