This converter turns inches of mercury into bar instantly, using the exact factor 1 inch of mercury = 0.03386389 bar. 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. Almost exactly atmospheric pressure; standard in European industry and diving.
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
0.03386389- The exact number of bar in one inch of mercury
bar- 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 0.03386389, the exact conversion factor.
- The result is displayed in bar, 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 0.03386389. That gives 0.169319 bar. A quick sanity check: one inch of mercury is smaller than one bar, so the number should get smaller — and it does.
Converting 72 inches of mercury
72 × 0.03386389 = 2.4382 bar. Working backwards, 2.4382 ÷ 0.03386389 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 bar are in one inch of mercury?
Exactly 0.03386389. 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 bar?
Bar = inches of mercury × 0.03386389. To reverse it, divide instead: inches of mercury = bar ÷ 0.03386389, which is the same as multiplying by 29.52998016.
Is the inch of mercury bigger than the bar?
No. One inch of mercury is only 0.0338639 of a bar, so the bar is the larger unit.
Why does my answer differ slightly from other inhg to bar 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 bar?
Almost exactly atmospheric pressure; standard in European industry and diving.
Inches Of Mercury to bar reference table
| Inches Of Mercury | Bar |
|---|---|
| 0.5 inHg | 0.016932 bar |
| 1 inHg | 0.033864 bar |
| 2 inHg | 0.067728 bar |
| 3 inHg | 0.101592 bar |
| 5 inHg | 0.169319 bar |
| 10 inHg | 0.338639 bar |
| 15 inHg | 0.507958 bar |
| 20 inHg | 0.677278 bar |
| 25 inHg | 0.846597 bar |
| 50 inHg | 1.6932 bar |
| 75 inHg | 2.5398 bar |
| 100 inHg | 3.3864 bar |
| 250 inHg | 8.466 bar |
| 500 inHg | 16.9319 bar |
| 1000 inHg | 33.8639 bar |
Exact factor: 1 inch of mercury = 0.03386389 bar. Values rounded for display.