PSI to KSI
Convert psi to ksi instantly. 1 psi = 0.001 ksi. Includes the exact factor, a conversion table of common values and the definition of both units.
How to convert psi to ksi
To convert psi to ksi, divide by 1,000 (multiply by 0.001). The relationship is fixed, so the same factor works for any quantity — there is nothing to look up and nothing that changes with temperature, location or context.
ksi = psi × 0.001
PSI to KSI conversion table
The values people look up most often, rounded for reading. Use the calculator above for anything in between.
| PSI | KSI |
|---|---|
| 1 psi | 0.001 ksi |
| 2 psi | 0.002 ksi |
| 3 psi | 0.003 ksi |
| 5 psi | 0.005 ksi |
| 10 psi | 0.01 ksi |
| 20 psi | 0.02 ksi |
| 25 psi | 0.025 ksi |
| 50 psi | 0.05 ksi |
| 100 psi | 0.1 ksi |
| 500 psi | 0.5 ksi |
| 1,000 psi | 1 ksi |
What is a psi?
Pounds per square inch, the US pressure unit for tyres and plumbing.
What is a ksi?
A thousand psi, used for structural steel strength.
The formula
ksi = psi × 0.001
Every result on this page comes from this formula. Nothing is rounded until the final display, so figures match a spreadsheet to the cent.
How to use the PSI to KSI
- Type the number of psi you want to convert.
- Read the result in ksi straight away — there is no button to press.
- Check the table below for the values that come up most often, or reverse the conversion with the linked ksi to psi page.
PSI to KSI — frequently asked questions
How many ksi are in a psi?
One psi equals 0.001 ksi. ksi = psi × 0.001
What is the formula to convert psi to ksi?
The formula is ksi = psi × 0.001. It is an exact definition rather than an approximation, so the conversion never drifts no matter how large the number.
How do I convert ksi back to psi?
Divide instead of multiplying: one ksi is 1,000 psi. The reverse converter is linked in the related tools list.
Is this conversion exact?
Yes. Both units are defined against the same base unit by international agreement, so the factor is exact — any rounding you see is only in the display, which you can widen by entering more decimal places.
Is this psi to ksi free to use?
Yes. Every calculator on the site is free, needs no sign-up, and runs entirely in your browser, so your figures never leave your device.
What people search for
This page answers each of these searches. They are the exact phrases visitors use to find the psi to ksi.
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About this calculator
Written and reviewed by The Samsung Calculator editorial team. Every calculator is written against a published formula, reviewed against at least one independent reference implementation, and dated when it changes.
Last reviewed August 19, 2026 · Calculation runs client-side · No data collected · Report an error