How do you convert inches of mercury to gigapascals?

To convert inches of mercury (inHg) to gigapascals (GPa), multiply the pressure in inches of mercury by 0.00000338 (gigapascals = inches of mercury × 0.00000338).

What is 5 inches of mercury in gigapascals?

5 inches of mercury (5 inHg) is equal to 0.00001693 gigapascals (0.00001693 GPa).

Which is larger, 1 inch of mercury (inhg) (inHg) or 1 gigapascal (GPa)?

One gigapascal (GPa) is larger than one inch of mercury (inhg) (inHg). Specifically, 1 GPa equals 295,299.80164712 inHg, while 1 inHg is 0.00000338 GPa.

How do I convert back from gigapascals (GPa) to inches of mercury (inHg)?

To reverse the calculation from GPa to inHg, multiply your gigapascal value by the inverse factor 295,299.80164712 (or divide by 0.00000338). You can also click the Swap button in the tool above to flip directions in one click.

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

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

Inches of Mercury to Gigapascals Converter

Enter the pressure in inches of mercury below to convert it to gigapascals.

Gigapascals to Inches of Mercury (GPa → inHg)

Convert Inches of Mercury to Gigapascals

Enter a value in inches of mercury (inHg) to convert to gigapascals (GPa).

Value (inHg)

From

Result

•

0.000016932gigapascals

5 inHg = 0.000016932 GPa

Result updates automatically

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Equivalent Measurements Across UnitsFor 5 inHg

Pascals16,931.945 Pa

Kilopascals16.93195 kPa

Bars0.16932 bar

PSI2.45577 psi

Atmospheres0.16711 atm

Suggested Conversions

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

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Inch of Mercury to Gigapascal Conversion Table

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

Inches of Mercury (inHg)	Gigapascals (GPa)
1 inHg	0.000003386 GPa
10 inHg	0.000033864 GPa
100 inHg	0.000338639 GPa
1,000 inHg	0.0033864 GPa
10,000 inHg	0.0338639 GPa
100,000 inHg	0.3386389 GPa
1,000,000 inHg	3.386389 GPa
5,000,000 inHg	16.931945 GPa
10,000,000 inHg	33.86389 GPa
25,400,000 inHg	86.0142806 GPa

How to Convert Inches of Mercury to Gigapascals

To convert inches of mercury to gigapascals, multiply the pressure by the following conversion ratio: 0.000003386 gigapascals/inch of mercury.

Since one inch of mercury is equal to 0.000003386 gigapascals, you can use this simple formula to convert:

gigapascals = inches of mercury × 0.000003386

The pressure in gigapascals is equal to the pressure in inches of mercury multiplied by 0.000003386.

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

gigapascals = (5 inHg × 0.000003386) = 0.000016932 GPa

How Many Gigapascals Are in an Inch of Mercury?

There are 0.000003386 gigapascals in an inch of mercury, which is why we use this value in the formula above.

1 inHg = 0.000003386 GPa|1 GPa = 295,299.8016471 inHg

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

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

What Is an Inch of Mercury?

An inch of mercury is a unit of pressure equal to 3,386.389 pascals (Pa), the base unit for pressure. Aviation altimeter & weather barometer unit equal to 3,386.389 Pascals. [1]

The inch of mercury is classified as a US customary unit of pressure. Inches of Mercury can be abbreviated as inHg; for example, 1 inch of mercury can be written as 1 inHg.

When working with inches of mercury (inHg) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.

In practice, inches of mercury (inHg) are widely used across large-scale industrial, bulk, and macro-level pressure specifications within US customary workflows, engineering documentation, and technical data sheets.

Learn more about inches of mercury 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 inches of mercury (inHg) and gigapascals (GPa), keep full floating-point precision (1 inHg = 0.000003386 GPa; 1 GPa = 295,299.8016471 inHg) during intermediate calculations and round only the final gigapascal figure to match your instrument tolerance.

More Inch of Mercury & Gigapascal Conversions

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

Convert from Inches of Mercury

Convert to Gigapascals

Frequently Asked Questions

There are 0.00000338 gigapascals (GPa) in 1 inch of mercury (inHg). Conversely, 1 gigapascal (GPa) is equal to 295,299.80164712 inches of mercury (inHg).

Pressure Converter

Quick Info

Direct Factor: 1 inch of mercury (inhg) (inHg) equals 0.00000338 gigapascals (GPa).
Inverse Factor: 1 gigapascal (GPa) equals 295,299.80164712 inches of mercury (inHg).
Formula: gigapascals = inches of mercury × 0.00000338.
Verified Precision: Anchored to official NIST SP 811 and ISO/IEC 80000 standards.

Units Comparison

Inch of Mercury (inHg) (inHg)

Aviation altimeter & weather barometer unit equal to 3,386.389 Pascals.

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 — Inches of Mercury (inHg) to Gigapascals (GPa)
NIST SP 811 Standard
[2]
NIST CUU (Derived SI Unit: Pascal (Pa))·Unit Specifications: Inch of Mercury (inHg) (inHg) & Gigapascal (GPa)
NIST CUU Specification
[3]
BIPM (SI Brochure (9th Ed.) — Mechanics)·Conversion Factors & Mathematical Basis (inHg to GPa)
BIPM Reference

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