mmHg to inHg Converter
Pressure · unit-converter
Convert mmHg to inHg with a fixed input and output unit, step-by-step formula line, and reference tables. All calculations bridge through pascal with fixed definitions (standard atmosphere = 101,325 Pa; torr and mmHg = atm/760; plus industrial/manometer units like kgf/cm², inHg, inH2O, and mmH2O).
About mmHg
Millimeters of mercury (mmHg) is common in medicine (e.g. blood pressure). Here it uses the same Pa per unit as torr (133.32236842105263 Pa).
About inHg
Inches of mercury (inHg) is used in aviation altimetry and vacuum readings in some US contexts.
How to convert millimeter of mercury (mmhg) to inch of mercury (inhg)
1 mmhg equals 0.03937007874021255 inhg in this tool (via pascal):
1 mmhg = (133.32236842105263 Pa ÷ 3386.38815789 Pa) inhg = 0.03937007874021255 inhg
Each mmhg carries 133.32236842105263 Pa and each inhg 3386.38815789 Pa, so one mmhg equals 133.32236842105263 ÷ 3386.38815789 inhg.
Let p(mmhg) be pressure in mmHg (mmhg), and p(inhg) in inHg (inhg). Then:
p(inhg) = p(mmhg) × (133.32236842105263 / 3386.38815789)
Equivalently, divide by how many mmhg fit into one inhg (Pa per inhg divided by Pa per mmhg):
p(inhg) = p(mmhg) ÷ 25.39999999996447
Examples
Example #1: Convert 1 mmhg to inhg
1 mmhg = 1 mmhg × (133.32236842105263/3386.38815789) inhg = 0.0393700787 inhg
1 mmhg = 1 mmhg ÷ 25.39999999996447 = 0.0393700787 inhg
1 mmhg × (133.32236842105263/3,386.38815789) = 0.039370 inhg
Example #2: Convert 10 mmhg to inhg
10 mmhg = 10 mmhg × (133.32236842105263/3386.38815789) inhg = 0.3937007874 inhg
10 mmhg = 10 mmhg ÷ 25.39999999996447 = 0.3937007874 inhg
10 mmhg × (133.32236842105263/3,386.38815789) = 0.393701 inhg
Summary
To convert mmHg to inHg, multiply the value in mmhg by (133.32236842105263 Pa per mmhg) / (3386.38815789 Pa per inhg). Equivalently: value_inhg = value_mmhg × (133.32236842105263 / 3386.38815789). Numerically, 1 mmhg equals 0.03937007874021255 inhg.
Relationship context
Both mmHg and inHg are converted by fixed multiples of the pascal. Multiplying by (Pa per mmhg) ÷ (Pa per inhg) gives the same result as passing through pascal, keeping bar, atm, PSI, kPa, hPa, torr, and mmHg consistent on the hub.
Conversion tables
| mmHg (mmhg) | inHg (inhg) |
|---|---|
| 0.1 | 0.0039370079 |
| 1 | 0.0393700787 |
| 2 | 0.0787401575 |
| 3 | 0.1181102362 |
| 4 | 0.157480315 |
| 5 | 0.1968503937 |
| 6 | 0.2362204724 |
| 7 | 0.2755905512 |
| 8 | 0.3149606299 |
| 9 | 0.3543307087 |
| mmHg (mmhg) | inHg (inhg) |
|---|---|
| 10 | 0.3937007874 |
| 20 | 0.7874015748 |
| 30 | 1.1811023622 |
| 40 | 1.5748031496 |
| 50 | 1.968503937 |
| 60 | 2.3622047244 |
| 70 | 2.7559055118 |
| 80 | 3.1496062992 |
| 90 | 3.5433070866 |
| 100 | 3.937007874 |