📏 Millimeters of mercury to Atmospheres Converter
Convert millimeters of mercury (mmHg) to atmospheres (atm) instantly, with the formula, a worked example and a conversion table.
Quick answer: 1 millimeter of mercury (mmHg) = 0.0013157897 atmospheres (atm). Formula: atm = mmHg × 0.0013157897.
Updated · Free · No sign-up · Works on any device
Millimeters of mercury to Atmospheres Converter inputs
Result
1 mmHg =
0.0013157897 atm
atm = mmHg × 0.0013157897
1 millimeter of mercury = 0.0013157897 atm · atm to mmHg
Millimeters of mercury to Atmospheres conversion table
| Millimeters of mercury (mmHg) | Atmospheres (atm) |
|---|---|
| 0.1 mmHg | 0.000131579 atm |
| 0.5 mmHg | 0.0006578948 atm |
| 1 mmHg | 0.0013157897 atm |
| 2 mmHg | 0.0026315793 atm |
| 3 mmHg | 0.003947369 atm |
| 5 mmHg | 0.0065789483 atm |
| 10 mmHg | 0.013157897 atm |
| 20 mmHg | 0.026315793 atm |
| 25 mmHg | 0.032894742 atm |
| 50 mmHg | 0.065789483 atm |
| 100 mmHg | 0.13157897 atm |
| 1,000 mmHg | 1.3157897 atm |
Other pressure conversions
How to convert millimeters of mercury to atmospheres
Multiply the number of millimeters of mercury by 0.0013157897 to get atmospheres: atm = mmHg × 0.0013157897.
Example: 5 mmHg = 0.0065789483 atm.
The millimeter of mercury (mmHg) and the atmosphere (atm) are both units of pressure. Need the opposite direction? Use the atm to mmHg converter.
Popular conversions
Centimeter to InchInch to CentimeterFoot to MeterMeter to FootKilometer to MileMile to KilometerKilogram to PoundPound to KilogramCelsius to FahrenheitFahrenheit to CelsiusMilliliter to US cupUS cup to MilliliterLiter to US gallonUS gallon to LiterGram to OunceOunce to GramSquare foot to Square meterAcre to HectareKilometer per hour to Mile per hourMile per hour to Kilometer per hourMegabyte to GigabytePound per square inch to Bar
Metric and imperial units
The metric system (SI) is used by almost every country and by science worldwide. Its units scale by powers of ten – 1 kilometer is 1,000 meters, 1 meter is 100 centimeters – which makes conversions inside the system easy. The imperial and US customary systems (inches, feet, pounds, gallons) are still used daily in the United States and partly in the UK.
Since 1959 the inch has been defined as exactly 2.54 centimeters and the pound as exactly 0.45359237 kilograms, so conversions between the two systems are exact. Note that a US gallon (3.785 L) and an imperial gallon (4.546 L) are different – choose the right one above.
This converter covers 10 categories and 66 units: length, weight, temperature, volume, area, speed, time, data, energy, pressure.
Frequently asked questions
How many atmospheres are in a millimeter of mercury?
1 millimeter of mercury = 0.0013157897 atmospheres.
How do I convert millimeters of mercury to atmospheres?
Use the formula atm = mmHg × 0.0013157897. For example, 5 mmHg = 0.0065789483 atm.
How do I convert atmospheres back to millimeters of mercury?
1 atmosphere = 759.99989 millimeters of mercury. Use the atm to mmHg converter linked on this page.
Are these conversions exact?
Yes – all factors use the internationally defined values (for example 1 inch = 2.54 cm exactly, 1 pound = 0.45359237 kg exactly). Results are rounded to 8 significant digits for display.