One ksi is 1,000 psi. Engineers use ksi to keep strength values short: 60 ksi rebar has a 60,000 psi yield strength.
How to use the ksi to PSI Converter
- Type the number of ksi into the Ksi field. Decimals such as 0.5 are fine.
- Read the answer in Psi. It updates as you type, with no button to press. The same amount is also shown in MPa, kPa, bar.
- To go from psi back to ksi, type into the Psi field instead. Every field also has a unit menu with all 18 pressure units, for example Pa, kPa, MPa, GPa, hPa, bar, mbar, atm, psf, mmHg, Torr.
Results update as you type, and everything is calculated in your browser.
How it works
Both units measure pressure, so they are always in the same ratio: one kilopound per square inch equals 1,000 psi. The calculator multiplies the number of ksi you type by 1,000 to give psi, and when you type into the psi field it divides by the same factor to give ksi. Because the ratio never changes, doubling the ksi always doubles the psi, for example 2 ksi is 2,000 psi.
How to convert ksi to psi
- Write down the value in ksi, for example 1 ksi.
- Multiply by the conversion factor 1,000 (because 1 kilopound per square inch = 1,000 psi).
- 1 × 1,000 = 1,000 psi.
- To go back from psi to ksi, divide by 1,000, or multiply by 0.001.
ksi to psi conversion table
| Ksi | Psi | Psi | Ksi |
|---|---|---|---|
| 0.5 ksi | 500 psi | 1 psi | 0.001 ksi |
| 1 ksi | 1,000 psi | 2 psi | 0.002 ksi |
| 2.5 ksi | 2,500 psi | 5 psi | 0.005 ksi |
| 3 ksi | 3,000 psi | 10 psi | 0.01 ksi |
| 4 ksi | 4,000 psi | 20 psi | 0.02 ksi |
| 5 ksi | 5,000 psi | 50 psi | 0.05 ksi |
| 36 ksi | 36,000 psi | 100 psi | 0.1 ksi |
| 50 ksi | 50,000 psi | 1,000 psi | 1 ksi |
| 60 ksi | 60,000 psi |
Pressure units explained
- Kilopound per square inch (ksi)
- A ksi is 1,000 psi. U.S. engineers use it for material strengths, such as 36 ksi structural steel or 4 ksi concrete.
- Pound per square inch (psi)
- Pounds per square inch is the pressure of one pound-force on one square inch, about 6,895 Pa. U.S. tyre gauges, compressors and hydraulic equipment read psi.
Formula
1 kilopound per square inch = 1,000 psi
1 pound per square inch = 0.001 ksi
psi = ksi × 1,000
Worked example
Inputs: Ksi: 1 ksi.
Results: Psi = 1,000 psi; Megapascals = 6.89475729 MPa; Kilopascals = 6,894.75729317 kPa; Bar = 68.94757293 bar.
Frequently asked questions
How many psi in a ksi?
1,000.
What is 4 ksi concrete?
Concrete with 4,000 psi compressive strength.
How do I convert ksi to psi?
Multiply the number of ksi by 1,000. For example, 1 kilopound per square inch × 1,000 = 1,000 psi.
How do I convert psi back to ksi?
Divide by 1,000 (or multiply by 0.001), or simply type the value into the psi field above.
What is 5 ksi in psi?
5 ksi = 5,000 psi.
What is 50 ksi in psi?
50 ksi = 50,000 psi.
Is the ksi to psi conversion exact?
Yes. The official definitions (NIST and the SI) fix 1 kilopound per square inch = 1,000 psi exactly, so the only difference you may see is rounding in the last displayed digit.