How many gigapascals are in 1 psi?

1 psi equals 0.0000068948 gigapascals, using the exact defined conversion factor rather than an estimate.

How do I convert psi to gigapascal?

Multiply the psi value by 0.000006894757293. The converter above does this instantly to whatever precision you set.

How do I convert gigapascal back to psi?

Use the reverse factor: 1 gigapascal equals 145,037.7377 psi. 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 pressure.

Is the psi to gigapascal 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.

PSI to Gigapascals Converter

Q: 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.

About Converting PSI to Gigapascals

PSI and Gigapascal both show up on pressure gauges — psi is standard on US tire and tool specifications, while bar is the everyday pressure unit across most of the rest of the world. PSI is most often used for tire pressure specifications in the us.

Formula

gigapascals = psi × 0.00000689475729317

This factor comes from each unit's defined relationship to the category's base unit: 1 psi equals 6894.75729317 base units, and 1 gigapascal equals 1000000000 base units, so dividing one by the other gives the direct psi-to-gigapascal factor of 0.00000689475729317.

Simple example

1 psi × 0.000006894757293 = 0.0000068948 GPa

1 psi = 0.0000068948 gigapascals.

Real-world example

35 psi × 0.000006894757293 = 0.0002413165 GPa

35 psi = 0.0002413165 gigapascals.

Conversion table

PSI (psi)	Gigapascal (GPa)
1 psi	0.0000068948 GPa
5 psi	0.0000344738 GPa
10 psi	0.0000689476 GPa
25 psi	0.0001723689 GPa
50 psi	0.0003447379 GPa
100 psi	0.0006894757 GPa

Reverse conversion: Gigapascal to PSI

0.0000068948 GPa × 145037.7377 = 1.000006194 psi

0.0000068948 gigapascals = 1.000006194 psi.

psi = gigapascals × 145037.73773

For a page dedicated to this direction, see Gigapascal to PSI.

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.

Understanding the Gigapascal (GPa)

Gigapascal is 1000000000 pascal units.

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.

PSI to Gigapascals Converter — psi to GPa

Pressure Converter