How do you convert inches of mercury to kilopascals?

To convert inches of mercury (inHg) to kilopascals (kPa), multiply the pressure in inches of mercury by 3.38639 (kilopascals = inches of mercury × 3.38639).

What is 5 inches of mercury in kilopascals?

5 inches of mercury (5 inHg) is equal to 16.93195 kilopascals (16.93195 kPa).

Which is larger, 1 inch of mercury (inhg) (inHg) or 1 kilopascal (kPa)?

One inch of mercury (inhg) (inHg) is larger than one kilopascal (kPa). Specifically, 1 inHg contains 3.38639 kPa, whereas 1 kPa is 0.2953 inHg.

How do I convert back from kilopascals (kPa) to inches of mercury (inHg)?

To reverse the calculation from kPa to inHg, multiply your kilopascal value by the inverse factor 0.2953 (or divide by 3.38639). 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 kPa results to?

For everyday comparisons and quick estimates, rounding to 2 decimal places is usually sufficient (for example, 5 inHg ≈ 16.93 kPa). For engineering, laboratory, or machining specifications, select 4 or 6 decimals—or Scientific (10ⁿ) mode—in the calculator toolbar above.

Inches of Mercury to Kilopascals Converter

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

Kilopascals to Inches of Mercury (kPa → inHg)

Convert Inches of Mercury to Kilopascals

Enter a value in inches of mercury (inHg) to convert to kilopascals (kPa).

Value (inHg)

From

Result

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16.931945kilopascals

5 inHg = 16.931945 kPa

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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))

[1–3] ↓

Inch of Mercury to Kilopascal Conversion Table

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

Inches of Mercury (inHg)	Kilopascals (kPa)
1 inHg	3.386389 kPa
2 inHg	6.772778 kPa
2.5 inHg	8.4659725 kPa
5 inHg	16.931945 kPa
10 inHg	33.86389 kPa
15 inHg	50.795835 kPa
20 inHg	67.72778 kPa
25 inHg	84.659725 kPa
30 inHg	101.59167 kPa
50 inHg	169.31945 kPa

How to Convert Inches of Mercury to Kilopascals

To convert inches of mercury to kilopascals, multiply the pressure by the following conversion ratio: 3.386389 kilopascals/inch of mercury.

Since one inch of mercury is equal to 3.386389 kilopascals, you can use this simple formula to convert:

kilopascals = inches of mercury × 3.386389

The pressure in kilopascals is equal to the pressure in inches of mercury multiplied by 3.386389.

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

kilopascals = (5 inHg × 3.386389) = 16.931945 kPa

How Many Kilopascals Are in an Inch of Mercury?

There are 3.386389 kilopascals in an inch of mercury, which is why we use this value in the formula above.

1 inHg = 3.386389 kPa|1 kPa = 0.2952998 inHg

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

Inches of Mercury and kilopascals 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 Kilopascal?

A kilopascal is a unit of pressure equal to 1,000 pascals (Pa), the base unit for pressure. Equal to 1,000 Pascals (1 kN/m²). [2]

The kilopascal is classified as a metric and SI-compatible unit of pressure. Kilopascals can be abbreviated as kPa; for example, 1 kilopascal can be written as 1 kPa.

In the metric system, "kilo" is the standard SI prefix for thousands, or 10³. This makes the kilopascal (kPa) a convenient decimal multiple of the pascal (Pa).

In practice, kilopascals (kPa) are widely used across large-scale industrial, bulk, and macro-level pressure specifications within SI metric workflows, engineering documentation, and technical data sheets.

Learn more about kilopascals in our Pressure Converter.

When converting pressure between inches of mercury (inHg) and kilopascals (kPa), keep full floating-point precision (1 inHg = 3.386389 kPa; 1 kPa = 0.2952998 inHg) during intermediate calculations and round only the final kilopascal figure to match your instrument tolerance.

More Inch of Mercury & Kilopascal Conversions

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

Convert from Inches of Mercury

Convert to Kilopascals

Frequently Asked Questions

There are 3.38639 kilopascals (kPa) in 1 inch of mercury (inHg). Conversely, 1 kilopascal (kPa) is equal to 0.2953 inches of mercury (inHg).

Pressure Converter

Quick Info

Direct Factor: 1 inch of mercury (inhg) (inHg) equals 3.38639 kilopascals (kPa).
Inverse Factor: 1 kilopascal (kPa) equals 0.2953 inches of mercury (inHg).
Formula: kilopascals = inches of mercury × 3.38639.
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.

Kilopascal (kPa)

Equal to 1,000 Pascals (1 kN/m²).

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

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