Millimeters of Mercury to Atmospheres (mmHg → atm)
Formula
1 mmHg = 0.0013157858376511226 atmConversion Table
| mmHg | atm |
|---|---|
| 0 | 0 |
| 1.0000 | 0.0013158 |
| 2.0000 | 0.0026316 |
| 3.0000 | 0.0039474 |
| 4.0000 | 0.0052631 |
| 5.0000 | 0.0065789 |
| 6.0000 | 0.0078947 |
| 7.0000 | 0.0092105 |
| 8.0000 | 0.010526 |
| 9.0000 | 0.011842 |
| 10.000 | 0.013158 |
| 11.000 | 0.014474 |
| 12.000 | 0.015789 |
| 13.000 | 0.017105 |
| 14.000 | 0.018421 |
| 15.000 | 0.019737 |
| 16.000 | 0.021053 |
| 17.000 | 0.022368 |
| 18.000 | 0.023684 |
| 19.000 | 0.025000 |
| mmHg | atm |
|---|---|
| 20.000 | 0.026316 |
| 21.000 | 0.027632 |
| 22.000 | 0.028947 |
| 23.000 | 0.030263 |
| 24.000 | 0.031579 |
| 25.000 | 0.032895 |
| 26.000 | 0.034210 |
| 27.000 | 0.035526 |
| 28.000 | 0.036842 |
| 29.000 | 0.038158 |
| 30.000 | 0.039474 |
| 31.000 | 0.040789 |
| 32.000 | 0.042105 |
| 33.000 | 0.043421 |
| 34.000 | 0.044737 |
| 35.000 | 0.046053 |
| 36.000 | 0.047368 |
| 37.000 | 0.048684 |
| 38.000 | 0.050000 |
| 39.000 | 0.051316 |
| mmHg | atm |
|---|---|
| 40.000 | 0.052631 |
| 41.000 | 0.053947 |
| 42.000 | 0.055263 |
| 43.000 | 0.056579 |
| 44.000 | 0.057895 |
| 45.000 | 0.059210 |
| 46.000 | 0.060526 |
| 47.000 | 0.061842 |
| 48.000 | 0.063158 |
| 49.000 | 0.064474 |
| 50.000 | 0.065789 |
| 51.000 | 0.067105 |
| 52.000 | 0.068421 |
| 53.000 | 0.069737 |
| 54.000 | 0.071052 |
| 55.000 | 0.072368 |
| 56.000 | 0.073684 |
| 57.000 | 0.075000 |
| 58.000 | 0.076316 |
| 59.000 | 0.077631 |
| mmHg | atm |
|---|---|
| 60.000 | 0.078947 |
| 61.000 | 0.080263 |
| 62.000 | 0.081579 |
| 63.000 | 0.082895 |
| 64.000 | 0.084210 |
| 65.000 | 0.085526 |
| 66.000 | 0.086842 |
| 67.000 | 0.088158 |
| 68.000 | 0.089473 |
| 69.000 | 0.090789 |
| 70.000 | 0.092105 |
| 71.000 | 0.093421 |
| 72.000 | 0.094737 |
| 73.000 | 0.096052 |
| 74.000 | 0.097368 |
| 75.000 | 0.098684 |
| 76.000 | 0.10000 |
| 77.000 | 0.10132 |
| 78.000 | 0.10263 |
| 79.000 | 0.10395 |
Millimeters of Mercury to Atmospheres Conversion
Converting Millimeters of Mercury (mmHg) to Atmospheres (atm) is a common pressure conversion. 1 mmHg equals 0.001316 atm. For example, 100 mmHg is equal to 0.131579 atm.
Quick Mental Math: Millimeters of Mercury to Atmospheres
Divide millimeters-of-mercury by approximately 760 to convert to atmospheres.
Why is converting Millimeters of Mercury to Atmospheres tricky?
The non-integer divisor 760 requires careful mental arithmetic.
Quick Reference Values
1 mmHg = 0.001316 atm. 5 mmHg = 0.006579 atm. 10 mmHg = 0.013158 atm. 25 mmHg = 0.032895 atm. 50 mmHg = 0.065789 atm. 100 mmHg = 0.131579 atm.
What is Millimeters of Mercury?
Millimeters of Mercury (mmHg) is a unit of pressure. Millimeters of mercury (mmHg) measure pressure based on a column of mercury 1 millimeter high. It equals exactly 133.322387415 pascals, the SI derived unit for pressure, as defined by international standards. This unit is widely used in medical and meteorological fields for blood pressure and barometric pressure readings [nist-si-guide]. The mmHg unit originated from the mercury barometer invented by Evangelista Torricelli in 1643. It became standardized as a pressure unit because mercury's density allowed precise atmospheric pressure measurements. The adoption of the exact pascal conversion was formalized by the BIPM in the 20th century [bipm-si-brochure]. Millimeters of mercury remain common in healthcare worldwide, especially for blood pressure monitoring in the US and Europe. Meteorologists also use mmHg in weather reporting, though pascals are preferred in scientific contexts. Regulatory standards by ISO and NIST recognize mmHg for specific applications [nist-sp-811].
What is Atmospheres?
Atmospheres (atm) is a unit of pressure. One atmosphere (atm) is a unit of pressure defined as exactly 101,325 pascals (Pa). It approximates the average air pressure at sea level on Earth. The atmosphere unit is used for expressing pressures in meteorology and engineering [iso-80000]. The atmosphere was originally defined in the 19th century based on average sea-level air pressure. It was standardized by the International Union of Pure and Applied Chemistry (IUPAC) and other bodies to equal 101,325 Pa in the mid-20th century [nist-sp-811]. Atmospheres are used worldwide in scientific fields, including chemistry and physics, and in engineering applications like pressure vessel design. It is less common in everyday use outside these fields [nist-sp-811].
Common Misspellings
People often search for this conversion using these alternate spellings: millimeter of mercury, mm hg, millimeters mercury, mmhg, millimeters of mercery, atmosphers, atmosfere, atmospere, atmospherics. All of these refer to the Millimeters of Mercury to Atmospheres conversion.