How do you convert millipascals to inches of mercury?

To convert millipascals (mPa) to inches of mercury (inHg), multiply the pressure in millipascals by 2.952998e-7 (inches of mercury = millipascals × 2.952998e-7).

What is 5 millipascals in inches of mercury?

5 millipascals (5 mPa) is equal to 0.00000147 inches of mercury (0.00000147 inHg).

Which is larger, 1 millipascal (mPa) or 1 inch of mercury (inhg) (inHg)?

One inch of mercury (inhg) (inHg) is larger than one millipascal (mPa). Specifically, 1 inHg equals 3,386,389 mPa, while 1 mPa is 2.952998e-7 inHg.

How do I convert back from inches of mercury (inHg) to millipascals (mPa)?

To reverse the calculation from inHg to mPa, multiply your inch of mercury (inhg) value by the inverse factor 3,386,389 (or divide by 2.952998e-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 mPa to inHg results to?

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

Millipascals to Inches of Mercury Converter

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

Inches of Mercury to Millipascals (inHg → mPa)

Convert Millipascals to Inches of Mercury

Enter a value in millipascals (mPa) to convert to inches of mercury (inHg).

Value (mPa)

From

Result

•

0.000001476inches of mercury

5 mPa = 0.000001476 inHg

Result updates automatically

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Equivalent Measurements Across UnitsFor 5 mPa

Pascals0.005 Pa

Kilopascals0.000005 kPa

Bars5.000000e-8 bar

PSI7.251887e-7 psi

Atmospheres4.934616e-8 atm

Suggested Conversions

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

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Millipascal to Inch of Mercury Conversion Table

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

Millipascals (mPa)	Inches of Mercury (inHg)
1 mPa	0.000000295 inHg
10 mPa	0.000002953 inHg
100 mPa	0.00002953 inHg
1,000 mPa	0.0002953 inHg
10,000 mPa	0.002953 inHg
100,000 mPa	0.02953 inHg
1,000,000 mPa	0.2952998 inHg
5,000,000 mPa	1.476499 inHg
10,000,000 mPa	2.952998 inHg
25,400,000 mPa	7.500615 inHg

How to Convert Millipascals to Inches of Mercury

To convert millipascals to inches of mercury, multiply the pressure by the following conversion ratio: 0.000000295 inches of mercury/millipascal.

Since one millipascal is equal to 0.000000295 inches of mercury, you can use this simple formula to convert:

inches of mercury = millipascals × 0.000000295

The pressure in inches of mercury is equal to the pressure in millipascals multiplied by 0.000000295.

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

inches of mercury = (5 mPa × 0.000000295) = 0.000001476 inHg

How Many Inches of Mercury Are in a Millipascal?

There are 0.000000295 inches of mercury in a millipascal, which is why we use this value in the formula above.

1 mPa = 0.000000295 inHg|1 inHg = 3,386,389 mPa

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

Millipascals and inches of mercury are both units used to measure pressure. Keep reading to learn more about each unit.

What Is a Millipascal?

A millipascal is a unit of pressure equal to 1/1,000 of a pascal (0.001 Pa). One-thousandth of a Pascal. [1]

The millipascal is classified as a metric and SI-compatible unit of pressure. Millipascals can be abbreviated as mPa; for example, 1 millipascal can be written as 1 mPa.

In the metric system, "milli" is the standard SI prefix for thousandths, or 10⁻³. This makes the millipascal (mPa) a convenient decimal multiple of the pascal (Pa).

In practice, millipascals (mPa) are widely used across fine-tolerance laboratory, analytical, and micro-scale pressure measurements within SI metric workflows, engineering documentation, and technical data sheets.

Learn more about millipascals in our Pressure Converter.

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. [2]

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.

When converting pressure between millipascals (mPa) and inches of mercury (inHg), keep full floating-point precision (1 mPa = 0.000000295 inHg; 1 inHg = 3,386,389 mPa) during intermediate calculations and round only the final inch of mercury figure to match your instrument tolerance.

More Millipascal & Inch of Mercury Conversions

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

Convert from Millipascals

Convert to Inches of Mercury

Frequently Asked Questions

There are 2.952998e-7 inches of mercury (inHg) in 1 millipascal (mPa). Conversely, 1 inch of mercury (inHg) is equal to 3,386,389 millipascals (mPa).

Pressure Converter

Quick Info

Direct Factor: 1 millipascal (mPa) equals 2.952998e-7 inches of mercury (inHg).
Inverse Factor: 1 inch of mercury (inhg) (inHg) equals 3,386,389 millipascals (mPa).
Formula: inches of mercury = millipascals × 2.952998e-7.
Verified Precision: Anchored to official NIST SP 811 and ISO/IEC 80000 standards.

Units Comparison

Millipascal (mPa)

One-thousandth of a Pascal.

Inch of Mercury (inHg) (inHg)

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

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

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