Convert psi to ksi
1 psi = 0.001 ksi. 1 ksi = 1000 psi. Example: 36000 psi = 36000 × 0.001 = 36 ksi.
Also searched as psi to ksi, psi in ksi, psi into ksi, psi to ksi converter and how many ksi in a psi.
1 psi = 0.001 ksi
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk psi to ksi converter to paste a column from Excel.
How to Convert psi to ksi
- 1 psi = 0.001 ksi
- 1 ksi = 1000 psi
- Example: convert 36000 psi to ksi: 36000 psi = 36000 × 0.001 ksi = 36 ksi
Formula
ksi = psi ÷ 1000
Derivation from SI units:
- 1 psi = 1 lbf/in² = (0.45359237 kg × 9.80665 m/s²) ÷ (0.0254 m)² = 6894.757293168 Pa
- 1 ksi = 1000 psi = 1 kip/in² = 6.894757293168 MPa
- 1 psi = 6894.757293168 Pa ÷ 6894757.293168 Pa per ksi = 0.001 ksi
Both units are defined exactly, so the factor is exact. psi definition: psi; ksi definition: ksi.
Worked examples
- A yield strength of 36000 psi is 36 ksi.
36000 psi × 0.001 = 36 ksi - Concrete with f′c = 4000 psi is 4 ksi.
4000 psi × 0.001 = 4 ksi
psi to ksi conversion table
| psi | ksi |
|---|---|
| 0.01 psi | 0.00001 ksi |
| 0.05 psi | 0.00005 ksi |
| 0.1 psi | 0.0001 ksi |
| 0.25 psi | 0.00025 ksi |
| 0.5 psi | 0.0005 ksi |
| 1 psi | 0.001 ksi |
| 2 psi | 0.002 ksi |
| 5 psi | 0.005 ksi |
| 10 psi | 0.01 ksi |
| 14.7 psi | 0.0147 ksi |
| 15 psi | 0.015 ksi |
| 20 psi | 0.02 ksi |
| 25 psi | 0.025 ksi |
| 30 psi | 0.03 ksi |
| 32 psi | 0.032 ksi |
| 35 psi | 0.035 ksi |
| 40 psi | 0.04 ksi |
| 50 psi | 0.05 ksi |
| 60 psi | 0.06 ksi |
| 80 psi | 0.08 ksi |
| 100 psi | 0.1 ksi |
| 125 psi | 0.125 ksi |
| 150 psi | 0.15 ksi |
| 200 psi | 0.2 ksi |
| 500 psi | 0.5 ksi |
| 1000 psi | 1 ksi |
| 3000 psi | 3 ksi |
| 5000 psi | 5 ksi |
Where it's used
Stresses and strengths in psi are converted to ksi to shorten large numbers in structural, concrete and material calculations. Divide by 1000.
psi to other pressure units
| Conversion | 1 psi equals |
|---|---|
| psi to ksi | 0.001 ksi |
| psi to pascal | 6894.757293 Pa |
| psi to kilopascal | 6.894757293 kPa |
| psi to kilogram-force per square centimetre | 0.07030695796 kgf/cm² |
| psi to bar | 0.06894757293 bar |
| psi to millimeter of mercury | 51.7149252 mmHg |
| psi to inch of water | 27.67990471 inH₂O |
| psi to atmosphere | 0.06804596391 atm |
Show 12 more units
| psi to megapascal | 0.006894757293 MPa |
|---|---|
| psi to gigapascal | 0.000006894757293 GPa |
| psi to newton per square millimetre | 0.006894757293 N/mm² |
| psi to kilogram-force per square millimetre | 0.0007030695796 kgf/mm² |
| psi to millibar | 68.94757293 mbar |
| psi to torr | 51.71493257 Torr |
| psi to millimeter of water | 703.0695796 mmH₂O |
| psi to centimeter of water | 70.30695796 cmH₂O |
| psi to inch of mercury | 2.036020677 inHg |
| psi to decibar | 0.6894757293 dbar |
| psi to inch of water (60 °F) | 27.7075924 inH₂O (60 °F) |
| psi to barye | 68947.57293 Ba |
Frequently asked questions
How many psi is in a ksi?
Exactly 1000 psi.
How many ksi are in 1 psi?
1 psi = 0.001 ksi.
How do I convert psi to ksi?
Multiply the value in psi by 0.001, or divide it by 1000. For example, 36000 psi × 0.001 = 36 ksi.
Is the psi to ksi conversion exact?
Yes. Both units are defined exactly, and 1 psi is exactly 0.001 ksi.
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, "pound-force per square inch (psi)".
- 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)".
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert psi to ksi. Retrieved October 25, 2026, from https://scientificconverters.com/pressure/psi-to-ksi/
IEEE
Scientific Converters, "Convert psi to ksi," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/pressure/psi-to-ksi/