PSI stands for pound-force per square inch. It is a common pressure unit in Anglo-American technical practice.
PSI remained deeply embedded in automotive, hydraulic and field-service traditions even after SI usage spread more widely.
Measurement system: Imperial and US engineering usage. SI equivalent: 1 psi = 6894.757293168 Pa.
PSI facts
- Unit name
- PSI
- Symbol
- psi
- Category
- Pressure
- Measurement system
- Imperial and US engineering usage
- SI equivalent
- 1 psi = 6894.757293168 Pa
- Common uses
- Tire pressure, hydraulic systems and technical service work
Definition of the psi
PSI stands for pound-force per square inch. It is a common pressure unit in Anglo-American technical practice.
Measurement system and SI relationship
Imperial and US engineering usage
SI equivalent: 1 psi = 6894.757293168 Pa
History of the psi
PSI remained deeply embedded in automotive, hydraulic and field-service traditions even after SI usage spread more widely.
Where is the psi used?
Tire pressure, hydraulic systems and technical service work