How do you convert hectopascals to gigapascals?

To convert hectopascals (hPa) to gigapascals (GPa), multiply the pressure in hectopascals by 1.000000e-7 (gigapascals = hectopascals × 1.000000e-7).

What is 5 hectopascals in gigapascals?

5 hectopascals (5 hPa) is equal to 5.000000e-7 gigapascals (5.000000e-7 GPa).

Which is larger, 1 hectopascal (hPa) or 1 gigapascal (GPa)?

One gigapascal (GPa) is larger than one hectopascal (hPa). Specifically, 1 GPa equals 10,000,000 hPa, while 1 hPa is 1.000000e-7 GPa.

How do I convert back from gigapascals (GPa) to hectopascals (hPa)?

To reverse the calculation from GPa to hPa, multiply your gigapascal value by the inverse factor 10,000,000 (or divide by 1.000000e-7). You can also click the Swap button in the tool above to flip directions in one click.

How many decimal places should I round hPa to GPa results to?

For everyday comparisons and quick estimates, rounding to 2 decimal places is usually sufficient (for example, 5 hPa ≈ 0.00 GPa). For engineering, laboratory, or machining specifications, select 4 or 6 decimals—or Scientific (10ⁿ) mode—in the calculator toolbar above.

Hectopascals to Gigapascals Converter

Enter the pressure in hectopascals below to convert it to gigapascals.

Gigapascals to Hectopascals (GPa → hPa)

Convert Hectopascals to Gigapascals

Enter a value in hectopascals (hPa) to convert to gigapascals (GPa).

Value (hPa)

From

Result

•

5e-7gigapascals

5 hPa = 5e-7 GPa

Result updates automatically

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Equivalent Measurements Across UnitsFor 5 hPa

Pascals500 Pa

Kilopascals0.5 kPa

Bars0.005 bar

PSI0.07252 psi

Atmospheres0.00493461 atm

Suggested Conversions

Reference:NIST SP 811 (NIST SP 811 App. B.9 (Pressure & Stress))

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Hectopascal to Gigapascal Conversion Table

Table showing various hectopascal measurements converted to gigapascals. Click any preset value or arrow to load it into the converter.

Hectopascals (hPa)	Gigapascals (GPa)
1 hPa	0.0000001 GPa
10 hPa	0.000001 GPa
100 hPa	0.00001 GPa
1,000 hPa	0.0001 GPa
10,000 hPa	0.001 GPa
100,000 hPa	0.01 GPa
1,000,000 hPa	0.1 GPa
5,000,000 hPa	0.5 GPa
10,000,000 hPa	1 GPa
25,400,000 hPa	2.54 GPa

How to Convert Hectopascals to Gigapascals

To convert hectopascals to gigapascals, multiply the pressure by the following conversion ratio: 0.0000001 gigapascals/hectopascal.

Since one hectopascal is equal to 0.0000001 gigapascals, you can use this simple formula to convert:

gigapascals = hectopascals × 0.0000001

The pressure in gigapascals is equal to the pressure in hectopascals multiplied by 0.0000001.

For example, here's how to convert 5 hectopascals to gigapascals using the formula above.

gigapascals = (5 hPa × 0.0000001) = 0.0000005 GPa

How Many Gigapascals Are in a Hectopascal?

There are 0.0000001 gigapascals in a hectopascal, which is why we use this value in the formula above.

1 hPa = 0.0000001 GPa|1 GPa = 10,000,000 hPa

Our hectopascal to gigapascal calculator automatically converts your pressure measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.

Hectopascals and gigapascals are both units used to measure pressure. Keep reading to learn more about each unit.

What Is a Hectopascal?

A hectopascal is a unit of pressure equal to 100 pascals (Pa), the base unit for pressure. Equal to 100 Pascals (identical to 1 millibar). [1]

The hectopascal is classified as a metric and SI-compatible unit of pressure. Hectopascals can be abbreviated as hPa; for example, 1 hectopascal can be written as 1 hPa.

In the metric system, "hecto" is the standard SI prefix for hundreds, or 10². This makes the hectopascal (hPa) a convenient decimal multiple of the pascal (Pa).

In practice, hectopascals (hPa) are widely used across standard pressure applications within SI metric workflows, engineering documentation, and technical data sheets.

Learn more about hectopascals in our Pressure Converter.

What Is a Gigapascal?

A gigapascal is a unit of pressure equal to 1,000,000,000 pascals (Pa), the base unit for pressure. Equal to 1,000,000,000 Pascals (1,000 MPa), used for elastic modulus of metals and diamond. [2]

The gigapascal is classified as an International System of Units (SI) unit of pressure. Gigapascals can be abbreviated as GPa; for example, 1 gigapascal can be written as 1 GPa.

In the metric system, "giga" is the standard SI prefix for billions, or 10⁹. This makes the gigapascal (GPa) a convenient decimal multiple of the pascal (Pa).

In practice, gigapascals (GPa) are widely used across large-scale industrial, bulk, and macro-level pressure specifications within International System of Units (SI) workflows, engineering documentation, and technical data sheets.

Learn more about gigapascals in our Pressure Converter.

When converting pressure between hectopascals (hPa) and gigapascals (GPa), keep full floating-point precision (1 hPa = 0.0000001 GPa; 1 GPa = 10,000,000 hPa) during intermediate calculations and round only the final gigapascal figure to match your instrument tolerance.

More Hectopascal & Gigapascal Conversions

Need to calculate in the opposite direction? Use our gigapascals to hectopascals calculator to switch your starting unit immediately. You can also explore related tools such as converting gigapascals to hectopascals, converting hectopascals to pascals, or converting hectopascals to inches of mercury.

Convert from Hectopascals

Convert to Gigapascals

Frequently Asked Questions

There are 1.000000e-7 gigapascals (GPa) in 1 hectopascal (hPa). Conversely, 1 gigapascal (GPa) is equal to 10,000,000 hectopascals (hPa).

Pressure Converter

Quick Info

Direct Factor: 1 hectopascal (hPa) equals 1.000000e-7 gigapascals (GPa).
Inverse Factor: 1 gigapascal (GPa) equals 10,000,000 hectopascals (hPa).
Formula: gigapascals = hectopascals × 1.000000e-7.
Verified Precision: Anchored to official NIST SP 811 and ISO/IEC 80000 standards.

Units Comparison

Hectopascal (hPa)

Equal to 100 Pascals (identical to 1 millibar).

Gigapascal (GPa)

Equal to 1,000,000,000 Pascals (1,000 MPa), used for elastic modulus of metals and diamond.

Pascal (Pa)

SI derived unit of pressure equal to 1 Newton per square meter (N/m²).

References

[1]NIST SP 811 · NIST SP 811 App. B.9 (Pressure & Stress)
Source
[2]NIST CUU · Derived SI Unit: Pascal (Pa)
Source
[3]BIPM · SI Brochure (9th Ed.) — Mechanics
Source

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References

NIST · BIPM · ISO

[1]
NIST SP 811 (NIST SP 811 App. B.9 (Pressure & Stress))·Pressure Metrology Standard — Hectopascals (hPa) to Gigapascals (GPa)
NIST SP 811 Standard
[2]
NIST CUU (Derived SI Unit: Pascal (Pa))·Unit Specifications: Hectopascal (hPa) & Gigapascal (GPa)
NIST CUU Specification
[3]
BIPM (SI Brochure (9th Ed.) — Mechanics)·Conversion Factors & Mathematical Basis (hPa to GPa)
BIPM Reference

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