This converter turns inches of mercury into kilopascals instantly, using the exact factor 1 inch of mercury = 3.386389 kilopascals. Type any number and the result updates as you go — nothing is sent to a server, so the arithmetic happens entirely in your browser.
US aviation and weather altimeter setting unit. The standard tyre-pressure unit in metric countries.
Because the relationship is a simple proportion, one multiplication does the whole job. The table further down gives pre-computed values for the amounts people look up most often, and the result panel also reports the reverse conversion so you can check the figure both ways.
The formula
inches of mercury- The amount you are converting, measured in inches of mercury
3.386389- The exact number of kilopascals in one inch of mercury
kilopascals- The converted result
How it works, step by step
- Enter the number of inches of mercury you want to convert.
- The value is multiplied by 3.386389, the exact conversion factor.
- The result is displayed in kilopascals, rounded for readability.
- The unrounded value and the reverse conversion appear underneath so you can verify it.
Worked examples
Converting 5 inches of mercury
Multiply 5 by 3.386389. That gives 16.9319 kilopascals. A quick sanity check: one inch of mercury is larger than one kilopascal, so the number should get bigger — and it does.
Converting 72 inches of mercury
72 × 3.386389 = 243.82 kilopascals. Working backwards, 243.82 ÷ 3.386389 returns 72 inches of mercury, which confirms the factor is applied the right way round.
How to read your score
Frequently asked questions
How many kilopascals are in one inch of mercury?
Exactly 3.386389. Every conversion on this page is that single number multiplied by your input, so the result carries no rounding error beyond what is shown.
What is the formula to convert inches of mercury to kilopascals?
Kilopascals = inches of mercury × 3.386389. To reverse it, divide instead: inches of mercury = kilopascals ÷ 3.386389, which is the same as multiplying by 0.2952998016.
Is the inch of mercury bigger than the kilopascal?
Yes. One inch of mercury equals 3.38639 kilopascals, so it is the larger unit.
Why does my answer differ slightly from other inhg to kilopascals converters?
Most differences come from rounding the factor too early. This tool keeps full double precision through the calculation and only rounds at the final display step, and it also shows the unrounded value so you can see exactly where any difference appears.
What is a inch of mercury?
US aviation and weather altimeter setting unit.
What is a kilopascal?
The standard tyre-pressure unit in metric countries.
Inches Of Mercury to kilopascals reference table
| Inches Of Mercury | Kilopascals |
|---|---|
| 0.5 inHg | 1.6932 kPa |
| 1 inHg | 3.3864 kPa |
| 2 inHg | 6.7728 kPa |
| 3 inHg | 10.1592 kPa |
| 5 inHg | 16.9319 kPa |
| 10 inHg | 33.8639 kPa |
| 15 inHg | 50.7958 kPa |
| 20 inHg | 67.7278 kPa |
| 25 inHg | 84.6597 kPa |
| 50 inHg | 169.3195 kPa |
| 75 inHg | 253.9792 kPa |
| 100 inHg | 338.6389 kPa |
| 250 inHg | 846.5973 kPa |
| 500 inHg | 1,693.19 kPa |
| 1000 inHg | 3,386.39 kPa |
Exact factor: 1 inch of mercury = 3.386389 kilopascals. Values rounded for display.