Unit conversions
Stress and Pressure Unit Converter (ksi, psi, MPa)
US codes use psi and ksi while international specifications use MPa. This converter uses the exact definition 1 psi = 6,894.757 Pa.
ksi in MPa MPa
ksi in psi psi
MPa in ksi ksi
MPa in psi psi
psf in kPa kPa
Formula
1 psi = 6,894.757 Pa, so 1 ksi = 6.894757 MPa and 1 MPa = 145.038 psi. 1 psf = 47.88026 Pa = 0.04788026 kPa.
Worked example
Grade 60 rebar yield of 60 ksi = 60 × 6.894757 = 413.7 MPa (Grade 420 in metric). Concrete of 28 MPa = 28 ÷ 6.894757 = 4.061 ksi = 4,061 psi. A 100 psf floor live load = 4.79 kPa.
Assumptions and limits
- Conversions are exact to the digits shown.
- Grades are often named with rounded metric values (Grade 60 = Grade 420).
Frequently asked questions
How many MPa is 1 ksi?
6.894757 MPa.
Is 4,000 psi concrete the same as 28 MPa?
Close. 4,000 psi is 27.6 MPa, and 28 MPa is 4,061 psi. The metric specifications commonly use 28 MPa as the counterpart.
How do I convert psf to psi?
Divide by 144, since there are 144 in² in 1 ft². 100 psf = 0.694 psi.