mmHg to inHg Converter

One mmHg equals 0.03937007313 inHg (1 mmHg = 0.03937007313 inHg). Multiply a mmHg value by 0.03937007313 to get the equivalent in inHg. Enter a value above to calculate the result. You can also use the formula and reference table below.

Formula

inHg = mmHg × 0.03937007313

Multiply the mmHg value by 0.03937007313 to get the equivalent value in inHg.

Example Conversions

1 mmHg (mmHg)

0.03937007313 inHg (inHg)

5 mmHg (mmHg)

0.1968503657 inHg (inHg)

10 mmHg (mmHg)

0.3937007313 inHg (inHg)

25 mmHg (mmHg)

0.9842518283 inHg (inHg)

100 mmHg (mmHg)

3.937007313 inHg (inHg)

Conversion Table

Common conversion values from mmHg to inHg
mmHg (mmHg)inHg (inHg)
0.10.003937007313
0.50.01968503657
10.03937007313
20.07874014626
50.1968503657
100.3937007313
250.9842518283
501.968503657
1003.937007313
2509.842518283
50019.68503657
100039.37007313

How to Convert Manually

Use these steps to convert mmHg values to inHg without the calculator.

  1. Write down the value in mmHg (mmHg) that you want to convert.
  2. Multiply that value by 0.03937007313.
  3. For example, 10 mmHg × 0.03937007313 = 0.3937007313 inHg.
  4. Label the result as inHg (inHg).

Relative Size Comparison

1 mmHg
1 inHg25.40000362 mmHg
1 inHg

This chart shows the visual difference in size between exactly one mmHg and one inHg.

About mmHg and inHg

The millimeter of mercury is about 133.322 pascals, the height a pressure pushes a mercury column. Blood pressure worldwide is still reported in mmHg. The inch of mercury is about 3,386.39 pascals. US weather reports and aviation altimeter settings quote barometric pressure in inches of mercury. One mmHg equals 0.03937007313 inHg (1 mmHg = 0.03937007313 inHg). mmHg is used in blood pressure readings and in medical vacuum and ventilation. inHg is used in US barometric weather reports.

Precision and Rounding:Several pressure factors are exact by definition (1 atm = 101,325 Pa; 1 bar = 100,000 Pa) while others, like psi and mmHg, are derived and carry long decimals. Tire and weather readings tolerate whole-number rounding; calibration, medicine, and process engineering need the full factor before rounding.

Use the pressure conversion guide to compare mmHg, mbar, inHg, kPa, Pa, and torr across medical, weather, aviation, vacuum, and engineering work.

Conversion factors per NIST Special Publication 811 and the BIPM SI Brochure (9th edition) (reference).

Worked Example

15mmHg equals0.590551097inHg.

15 mmHg × 0.03937007313 = 0.590551097 inHg

FAQ

How do I convert mmHg to inHg?

Multiply the mmHg value by 0.03937007313 to get the equivalent value in inHg.

What is the formula for mmHg to inHg?

The formula is inHg = mmHg × 0.03937007313.

How many inHg are in 1 mmHg?

1 mmHg equals 0.03937007313 inHg.

Can I convert inHg back to mmHg?

Yes. 1 inHg equals 25.40000362 mmHg, and the related converter can reverse the calculation.

What are common names for mmHg and inHg?

mmHg is shown as mmHg and may also be searched as millimeters of mercury, mm Hg. inHg is shown as inHg and may also be searched as inches of mercury, in Hg.

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