How many inHg is 1 kPa?

1 kilopascal equals 0.29530 inches of mercury. This is derived from the exact definition: 1 inHg = 3,386.389 Pa, so 1 kPa = 1,000 / 3,386.389 ≈ 0.29530 inHg.

What is standard atmospheric pressure in kPa and inHg?

Standard atmospheric pressure is 101.325 kPa, which equals 29.921 inHg. US aviation uses 29.92 inHg as the standard altimeter setting at mean sea level.

How do I convert kPa to inHg manually?

Multiply the kPa value by 0.295300. For example, 100 kPa × 0.295300 = 29.530 inHg. Alternatively, multiply by 1,000 to get Pa, then divide by 3,386.389.

What is a typical barometric pressure in kPa and inHg?

Fair weather typically shows 100.8–102.3 kPa (29.8–30.2 inHg). Readings above 102.3 kPa indicate high pressure; below 100.1 kPa suggests a storm system approaching.

Why is inHg used in aviation and weather in the US?

The US adopted the inch-of-mercury scale before SI units became standard. Aviation altimeters are calibrated in inHg in the US and Canada, while most other countries use hectopascals (hPa). Meteorological tradition in the US also kept inHg for public weather broadcasts.

Kilopascals to inHg Converter

Enter a pressure in kPa and get the equivalent in inches of mercury (inHg) instantly — reverse conversion included.

Converter

Pressure in kPa

Result in inHg

Reverse: inHg to kPa

Pressure in inHg

Result in kPa

Reference Table

kPa inHg Context

3.386 1.000 Definition: 1 inHg

84.0 24.80 Severe storm

98.0 28.94 Low pressure system

100.0 29.530 Below normal

101.325 29.921 Standard atmosphere

102.0 30.12 High pressure

103.0 30.42 Very high pressure

200.0 59.06 ~2 atm (pressure cooker)

1 inHg = 3,386.389 Pa • 1 kPa = 0.29530 inHg • 1 atm = 29.921 inHg = 101.325 kPa

Summary

This tool converts pressure from kilopascals (kPa) to inches of mercury (inHg), the unit used by US weather stations, aviation altimeters, and HVAC systems. One inch of mercury equals 3,386.389 pascals, making 1 kPa equal to approximately 0.29530 inHg. Use it to translate barometric pressure from metric weather APIs, set altimeter QNH, or cross-check HVAC duct pressure specs.

How it works

Enter the pressure value in kilopascals in the top input field.
The inHg result appears instantly below as you type.
Click "Copy" next to any result to copy it to your clipboard.
Use the reverse field to convert inHg back to kPa.
Check the reference table for common weather and aviation pressures.

Use cases

Translate barometric pressure from metric weather APIs (kPa) to the inHg display used by US weather apps.
Set a US aircraft altimeter: convert QNH in kPa to the inHg setting required by FAA standards.
Convert HVAC static pressure specs between kPa (SI) and inHg (US duct design standards).
Cross-check a kPa-rated pressure transducer against an inHg manometer reading.
Interpret storm or high-pressure alerts published in kPa on international weather services.
Convert vacuum pump performance ratings between kPa and inHg vacuum scales.

Frequently Asked Questions

Last updated: 2026-06-18 · Reviewed by Nham Vu