Gigapascal is 1000000000 pascal units.
Gigapascals to KSI Converter — GPa to ksi
Convert Gigapascal (GPa) to KSI (ksi) using the exact conversion factor (1 gigapascal = 145.0377377 ksi). See the formula, worked examples, and conversion table.
Gigapascals to KSI 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.
Kips per square inch.
Result = input x 1e+9 / 6.89475729e+6.
Stress Pressure units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Gigapascals to KSI
Gigapascal and KSI 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 kips per square inch.
Formula
ksi = gigapascals × 145.03773773
This factor comes from each unit's defined relationship to the category's base unit: 1 gigapascal equals 1000000000 base units, and 1 ksi equals 6894757.29317 base units, so dividing one by the other gives the direct gigapascal-to-ksi factor of 145.03773773.
Simple example
1 GPa × 145.0377377 = 145.0377377 ksi
1 gigapascal = 145.0377377 ksi.
Real-world example
100 GPa × 145.0377377 = 14,503.77377 ksi
100 gigapascals = 14,503.77377 ksi.
Conversion table
| Gigapascal (GPa) | KSI (ksi) |
|---|---|
| 1 GPa | 145.0377377 ksi |
| 10 GPa | 1,450.377377 ksi |
| 50 GPa | 7,251.886887 ksi |
| 100 GPa | 14,503.77377 ksi |
| 500 GPa | 72,518.86887 ksi |
| 1,000 GPa | 145,037.7377 ksi |
Reverse conversion: KSI to Gigapascal
145.0377377 ksi × 0.006894757293 = 0.9999999998 GPa
145.0377377 ksi = 0.9999999998 gigapascals.
gigapascals = ksi × 0.00689475729317
For a page dedicated to this direction, see KSI to Gigapascal.
Understanding the Gigapascal (GPa)
Gigapascal is 1000000000 pascal units.
Understanding the KSI (ksi)
Kips per square inch.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many ksi are in 1 gigapascal?
1 gigapascal equals 145.0377377 ksi, using the exact defined conversion factor rather than an estimate.
How do I convert gigapascal to ksi?
Multiply the gigapascal value by 145.0377377. The converter above does this instantly to whatever precision you set.
How do I convert ksi back to gigapascal?
Use the reverse factor: 1 ksi equals 0.0068947573 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 ksi?
KSI (ksi) is a unit of engineering.
Is the gigapascal to ksi conversion exact?
Yes. Both gigapascal and ksi are defined by fixed standards rather than physical artifacts, so the factor of 145.0377377 used above is exact to as many digits as you choose to display.
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.