The pascal is one newton per square meter.
Pascals to PSI Converter — Pa to psi
Convert Pascal (Pa) to PSI (psi) using the exact conversion factor (1 pascal = 0.0001450377 psi). See the formula, worked examples, conversion table, unit comparison, history, and common uses.
Pascals to PSI converter
Converter
Engineering Converter
Convert common stress, force, torque, power, and energy units used in engineering.
Context values
Some unit families need one extra value for a physically accurate result.
Pounds per square inch.
Result = input x 1 / 6894.757293.
Stress Pressure units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Pascals to PSI
Pascal and PSI both measure a quantity used in structural or mechanical engineering — commonly stress, pressure, force, torque, power, or energy — where converting between the unit conventions used in different regions, industries, or equipment specifications is a routine part of design work. Pascal is typically associated with standard scientific pressure unit worldwide, while PSI is typically associated with united States (standard pressure unit for tires, tools, and plumbing).
Formula
psi = pascals × 0.00014503773773
This factor comes from each unit's defined relationship to the category's base unit: 1 pascal equals 1 base unit, and 1 psi equals 6894.75729317 base units, so dividing one by the other gives the direct pascal-to-psi factor of 0.00014503773773.
Simple example
1 Pa × 0.0001450377377 = 0.0001450377 psi
1 pascal = 0.0001450377 psi.
Real-world example
100 Pa × 0.0001450377377 = 0.0145037738 psi
100 pascals = 0.0145037738 psi.
Conversion table
| Pascal (Pa) | PSI (psi) |
|---|---|
| 1 Pa | 0.0001450377 psi |
| 10 Pa | 0.0014503774 psi |
| 50 Pa | 0.0072518869 psi |
| 100 Pa | 0.0145037738 psi |
| 500 Pa | 0.0725188689 psi |
| 1,000 Pa | 0.1450377377 psi |
Reverse conversion: PSI to Pascal
0.0001450377 psi × 6894.757293 = 0.9999997399 Pa
0.0001450377 psi = 0.9999997399 pascals.
pascals = psi × 6894.75729317
For a page dedicated to this direction, see PSI to Pascal.
Pascal vs. PSI
| Aspect | Pascal | PSI |
|---|---|---|
| Family | SI derived unit | US/imperial customary unit |
| Typical use | Scientific and engineering pressure measurement worldwide | Tire pressure specifications in the US |
| Where it's used | Standard scientific pressure unit worldwide | United States (standard pressure unit for tires, tools, and plumbing) |
Understanding the Pascal
Pascal (Pa) measures pressure. The pascal is the SI derived unit of pressure: one newton of force per square meter. It is classified as a SI derived unit.
Where it's used: Standard scientific pressure unit worldwide
Uses of the Pascal today
- Scientific and engineering pressure measurement worldwide
- Meteorology (often as hectopascals, equivalent to millibars)
- Material science (stress and strength, typically in megapascals)
History of the Pascal
The pascal is named after Blaise Pascal, whose 17th-century experiments clarified the physics of fluid pressure and vacuum. It was adopted as the SI derived unit of pressure in 1971, replacing the older, non-coherent CGS pressure units used in much scientific work up to that point.
Historical origin. Pascal was not the invention of a single named person; it developed through the process described above.
Understanding the PSI
PSI (psi) measures pressure. PSI (pounds-force per square inch) equals exactly 6,894.757293168 pascals. It is classified as a US/imperial customary unit.
Where it's used: United States (standard pressure unit for tires, tools, and plumbing)
Uses of the PSI today
- Tire pressure specifications in the US
- Hydraulic and pneumatic system ratings
- Plumbing, compressed-air tools, and industrial equipment ratings
History of the PSI
PSI is a derived unit from the pound-force and the inch, both themselves standardized through English and later international agreements rather than invented as a pressure unit from scratch.
It became the default pressure unit in US engineering as pound-force and inch-based measurement dominated American industry through the 19th and 20th centuries, and it remains in everyday use for tires and tools even as most other measurements in the US context stay imperial.
Historical origin. PSI was not the invention of a single named person; it developed through the process described above.
Pascal — sources
- BIPM SI Brochure — Coherent derived units — Defines the pascal as the SI unit of pressure.
PSI — sources
- NIST Special Publication 811 — Guide for the Use of the International System of Units — Documents conversion factors for psi and other US customary pressure units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many psi are in 1 pascal?
1 pascal equals 0.0001450377 psi, using the exact defined conversion factor rather than an estimate.
How do I convert pascal to psi?
Multiply the pascal value by 0.0001450377377. The converter above does this instantly to whatever precision you set.
How do I convert psi back to pascal?
Use the reverse factor: 1 psi equals 6,894.757293 pascals. You can also use the swap control in the converter above to flip the direction instantly.
What is a pascal?
Pascal (Pa) measures pressure. The pascal is the SI derived unit of pressure: one newton of force per square meter. It is classified as a SI derived unit.
What is a psi?
PSI (psi) measures pressure. PSI (pounds-force per square inch) equals exactly 6,894.757293168 pascals. It is classified as a US/imperial customary unit.
Is the pascal to psi conversion exact?
Yes. PSI (pounds-force per square inch) equals exactly 6,894.757293168 pascals. That fixed definition is what the converter above uses, so any rounding you see is a display choice, not a limitation of the math.
Where is the pascal still used today?
Standard scientific pressure unit worldwide
Why do engineering unit conventions vary so much by region and industry?
Pressure, force, and stress can be expressed in metric (pascal, newton), US customary (psi, pound-force), or older and industry-specific units (atmosphere, torr, kip) depending on the country, industry, and even the equipment manufacturer, which is why engineers routinely need to convert between them when working across specs from different sources.