Convert Kilopascals to Inches of Mercury
Instantly convert Kilopascals (kPa) to Inches of Mercury (inHg) with our free online calculator.
Formula: kPa to inHg — multiply by 0.2953
Reference Table
| Kilopascals (kPa) | Inches of Mercury (inHg) |
|---|---|
| 1 | 0.2953 |
| 5 | 1.4765 |
| 10 | 2.953 |
| 25 | 7.38249 |
| 50 | 14.765 |
| 100 | 29.53 |
How to Convert Kilopascals to Inches of Mercury
Formula
To convert Kilopascals (kPa) to Inches of Mercury (inHg): multiply by 0.2953
Step-by-Step
- Start with your value in Kilopascals (kPa).
- Multiply by 0.2953 to perform the conversion.
- The result is your value expressed in Inches of Mercury (inHg).
Conversion Factor
1 kPa = 0.2953 inHg
Reverse Factor
1 inHg = 3.38639 kPa
Worked Example
Convert 25 Kilopascals to Inches of Mercury: 25 kPa = 7.38249 inHg
About Kilopascal (kPa)
A metric unit of pressure equal to exactly 1,000 pascals (1 kPa = 1,000 N/m²). Kilopascals are the everyday SI pressure unit outside the US: passenger car tire pressure in Europe and Australia is specified in kPa (typically 220-250 kPa cold), building HVAC duct static pressure is in kPa, and the ISO 5198 / IEC 60534 valve standards quote rated pressures in kPa. Weather forecasters quote surface atmospheric pressure in hectopascals (1 kPa = 10 hPa); a typical sea-level barometric reading is 1013 hPa = 101.3 kPa. The kPa is the standard report unit in clinical respiratory physiology (PaCO₂, PaO₂ in some ICUs) and in scientific gauge pressure measurement. Common conversions: kPa to psi is divide by 6.895; kPa to bar is divide by 100; kPa to mmHg is multiply by 7.5006.
About Inch of Mercury (inHg)
A pressure unit defined as the pressure exerted by a 1-inch column of mercury at the standard density of mercury (0 °C) and the standard acceleration of gravity (≈ 3,386.389 Pa per NIST SP 811). Inches of mercury are the primary unit in US aviation for altimeter settings (the QNH datum is reported in inHg in METAR weather observations — "Altimeter 30.12 inHg" means 30.12 inHg corrected to mean sea level), US barometric weather reporting on consumer indoor weather stations and TV weather graphics, HVAC and refrigeration duct/return static pressure (often quoted as fractions of an inHg, e.g., 0.25 inHg = ~62 Pa), and some legacy automotive vacuum gauges measuring intake-manifold vacuum below atmospheric (a healthy engine reads ~18-22 inHg of vacuum at idle). Standard sea-level atmospheric pressure is 29.92 inHg = 1013.25 hPa = 101.325 kPa.
Quick Facts
- 1 Kilopascal equals 0.2953 Inches of Mercury
- 1 Inch of Mercury equals 3.38639 Kilopascals
- Kilopascal is a unit of pressure
- Inch of Mercury is a unit of pressure
- This conversion is commonly used in tire inflation, weather reporting, scuba diving, and engineering
- The Kilopascal belongs to the metric system
- The Inch of Mercury belongs to the imperial system
Common Kilopascal to Inch of Mercury Conversions
| Kilopascals (kPa) | Inches of Mercury (inHg) |
|---|---|
| 0.1 | 0.02953 |
| 0.5 | 0.14765 |
| 1 | 0.2953 |
| 2 | 0.590599 |
| 5 | 1.4765 |
| 10 | 2.953 |
| 14.696 | 4.33972 |
| 15 | 4.4295 |
| 20 | 5.90599 |
| 25 | 7.38249 |
| 50 | 14.765 |
| 100 | 29.53 |
| 150 | 44.295 |
| 200 | 59.0599 |
| 500 | 147.65 |
| 1000 | 295.3 |
Understanding Kilopascals
The Kilopascal (symbol: kPa) is a unit of pressure. A metric unit of pressure equal to exactly 1,000 pascals (1 kPa = 1,000 N/m²). Kilopascals are the everyday SI pressure unit outside the US: passenger car tire pressure in Europe and Australia is specified in kPa (typically 220-250 kPa cold), building HVAC duct static pressure is in kPa, and the ISO 5198 / IEC 60534 valve standards quote rated pressures in kPa. Weather forecasters quote surface atmospheric pressure in hectopascals (1 kPa = 10 hPa); a typical sea-level barometric reading is 1013 hPa = 101.3 kPa. The kPa is the standard report unit in clinical respiratory physiology (PaCO₂, PaO₂ in some ICUs) and in scientific gauge pressure measurement. Common conversions: kPa to psi is divide by 6.895; kPa to bar is divide by 100; kPa to mmHg is multiply by 7.5006.
It belongs to the metric measurement system.
Kilopascals are commonly used in tire inflation, weather reporting, scuba diving, and engineering.
Understanding Inches of Mercury
The Inch of Mercury (symbol: inHg) is a unit of pressure. A pressure unit defined as the pressure exerted by a 1-inch column of mercury at the standard density of mercury (0 °C) and the standard acceleration of gravity (≈ 3,386.389 Pa per NIST SP 811). Inches of mercury are the primary unit in US aviation for altimeter settings (the QNH datum is reported in inHg in METAR weather observations — "Altimeter 30.12 inHg" means 30.12 inHg corrected to mean sea level), US barometric weather reporting on consumer indoor weather stations and TV weather graphics, HVAC and refrigeration duct/return static pressure (often quoted as fractions of an inHg, e.g., 0.25 inHg = ~62 Pa), and some legacy automotive vacuum gauges measuring intake-manifold vacuum below atmospheric (a healthy engine reads ~18-22 inHg of vacuum at idle). Standard sea-level atmospheric pressure is 29.92 inHg = 1013.25 hPa = 101.325 kPa.
It belongs to the imperial measurement system.
Inches of Mercury are commonly used in tire inflation, weather reporting, scuba diving, and engineering.
Why Convert Kilopascals to Inches of Mercury?
Engineers, mechanics, and scientists frequently need to convert pressure between Kilopascals and Inches of Mercury when working with different measurement standards. Tire pressure, blood pressure readings, weather barometric measurements, and industrial process specifications may all use different pressure units depending on the region or discipline. Reliable conversion prevents equipment misuse and ensures safety.
Frequently Asked Questions
How do I convert Kilopascals to Inches of Mercury?
A metric unit of pressure equal to exactly 1,000 pascals (1 kPa = 1,000 N/m²). To convert Kilopascals to Inches of Mercury, multiply by 0.2953. For example, 25 kPa equals 7.38249 inHg.
How many Inches of Mercury are in 1 Kilopascal?
There are 0.2953 Inches of Mercury in 1 Kilopascal.
How many Kilopascals are in 1 Inch of Mercury?
There are 3.38639 Kilopascals in 1 Inch of Mercury.
What is the formula for Kilopascal to Inch of Mercury conversion?
The formula is: multiply by 0.2953. This means 1 kPa = 0.2953 inHg.
Is a Kilopascal bigger than a Inch of Mercury?
Yes. One Kilopascal is larger than one Inch of Mercury because 1 kPa equals 0.2953 inHg, which is less than 1.
When do you need to convert between Kilopascals and Inches of Mercury?
A pressure unit defined as the pressure exerted by a 1-inch column of mercury at the standard density of mercury (0 °C) and the standard acceleration of gravity (≈ 3,386. Kilopascal and Inch of Mercury are both pressure units, so conversion comes up whenever one source of information uses one unit and another uses the other — a classic cross-reference challenge in engineering, trade, travel, and everyday life.