Gigapascal is 1000000000 pascal units.
Gigapascals to PSI Converter — GPa to psi
Convert Gigapascal (GPa) to PSI (psi) using the exact conversion factor (1 gigapascal = 145,037.7377 psi). See the formula, worked examples, conversion table, history, and common uses.
Gigapascals 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 1e+9 / 6894.757293.
Stress Pressure units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Gigapascals to PSI
Gigapascal 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. Specifically: Gigapascal is 1000000000 pascal units, and pounds per square inch.
Formula
psi = gigapascals × 145037.73773
This factor comes from each unit's defined relationship to the category's base unit: 1 gigapascal equals 1000000000 base units, and 1 psi equals 6894.75729317 base units, so dividing one by the other gives the direct gigapascal-to-psi factor of 145037.73773.
Simple example
1 GPa × 145037.7377 = 145,037.7377 psi
1 gigapascal = 145,037.7377 psi.
Real-world example
100 GPa × 145037.7377 = 14,503,773.77 psi
100 gigapascals = 14,503,773.77 psi.
Conversion table
| Gigapascal (GPa) | PSI (psi) |
|---|---|
| 1 GPa | 145,037.7377 psi |
| 10 GPa | 1,450,377.377 psi |
| 50 GPa | 7,251,886.887 psi |
| 100 GPa | 14,503,773.77 psi |
| 500 GPa | 72,518,868.87 psi |
| 1,000 GPa | 145,037,737.7 psi |
Reverse conversion: PSI to Gigapascal
1 psi × 0.000006894757293 = 0.0000068948 GPa
1 psi = 0.0000068948 gigapascals.
gigapascals = psi × 0.00000689475729317
For a page dedicated to this direction, see PSI to Gigapascal.
Understanding the Gigapascal (GPa)
Gigapascal is 1000000000 pascal units.
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.
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 gigapascal?
1 gigapascal equals 145,037.7377 psi, using the exact defined conversion factor rather than an estimate.
How do I convert gigapascal to psi?
Multiply the gigapascal value by 145037.7377. The converter above does this instantly to whatever precision you set.
How do I convert psi back to gigapascal?
Use the reverse factor: 1 psi equals 0.0000068948 gigapascals. You can also use the swap control in the converter above to flip the direction instantly.
What is a gigapascal?
Gigapascal (GPa) is a unit of engineering.
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 gigapascal 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.
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.