Convert Atmospheres to Millimeters of Mercury
Instantly convert Atmospheres (atm) to Millimeters of Mercury (mmHg) with our free online calculator.
Formula: atm to mmHg — multiply by 760.002
Reference Table
| Atmospheres (atm) | Millimeters of Mercury (mmHg) |
|---|---|
| 1 | 760.002 |
| 5 | 3800.01 |
| 10 | 7600.02 |
| 25 | 19000.1 |
| 50 | 38000.1 |
| 100 | 76000.2 |
How to Convert Atmospheres to Millimeters of Mercury
Formula
To convert Atmospheres (atm) to Millimeters of Mercury (mmHg): multiply by 760.002
Step-by-Step
- Start with your value in Atmospheres (atm).
- Multiply by 760.002 to perform the conversion.
- The result is your value expressed in Millimeters of Mercury (mmHg).
Conversion Factor
1 atm = 760.002 mmHg
Reverse Factor
1 mmHg = 0.00131579 atm
Worked Example
Convert 25 Atmospheres to Millimeters of Mercury: 25 atm = 19000.1 mmHg
About Atmosphere (atm)
A non-SI unit of pressure defined as 101,325 pascals exactly, corresponding to standard sea-level atmospheric pressure. Atmospheres are widely used in chemistry (reaction pressures), diving (depth in multiples of atmospheric pressure), and pressure-sensitive materials research. 1 atm = 1.01325 bar and is slightly different from the "technical atmosphere" (at, 98,066.5 Pa) used in some legacy European engineering — a known source of confusion in older textbooks.
About Millimeters of Mercury (mmHg)
A unit of pressure historically defined as the pressure exerted by a 1-millimeter column of mercury at standard gravity. Millimeters of mercury are the default unit for clinical blood-pressure readings worldwide ("120 over 80") and intraocular pressure in ophthalmology. The mmHg is numerically almost identical to the torr (1 mmHg ≈ 1.0000007 torr). Barometric atmospheric pressure was historically quoted in mmHg as well — 760 mmHg = 1 atm.
Quick Facts
- 1 Atmosphere equals 760.002 Millimeters of Mercury
- 1 Millimeters of Mercury equals 0.00131579 Atmospheres
- Atmosphere is a unit of pressure
- Millimeters of Mercury is a unit of pressure
- This conversion is commonly used in tire inflation, weather reporting, scuba diving, and engineering
- The Millimeters of Mercury belongs to the metric system
Common Atmosphere to Millimeters of Mercury Conversions
| Atmospheres (atm) | Millimeters of Mercury (mmHg) |
|---|---|
| 0.1 | 76.0002 |
| 0.5 | 380.001 |
| 1 | 760.002 |
| 2 | 1520 |
| 5 | 3800.01 |
| 10 | 7600.02 |
| 14.696 | 11169 |
| 15 | 11400 |
| 20 | 15200 |
| 25 | 19000.1 |
| 50 | 38000.1 |
| 100 | 76000.2 |
| 150 | 114000 |
| 200 | 152000 |
| 500 | 380001 |
| 1000 | 760002 |
Understanding Atmospheres
The Atmosphere (symbol: atm) is a unit of pressure. A non-SI unit of pressure defined as 101,325 pascals exactly, corresponding to standard sea-level atmospheric pressure. Atmospheres are widely used in chemistry (reaction pressures), diving (depth in multiples of atmospheric pressure), and pressure-sensitive materials research. 1 atm = 1.01325 bar and is slightly different from the "technical atmosphere" (at, 98,066.5 Pa) used in some legacy European engineering — a known source of confusion in older textbooks.
Atmospheres are commonly used in tire inflation, weather reporting, scuba diving, and engineering.
Understanding Millimeters of Mercury
The Millimeters of Mercury (symbol: mmHg) is a unit of pressure. A unit of pressure historically defined as the pressure exerted by a 1-millimeter column of mercury at standard gravity. Millimeters of mercury are the default unit for clinical blood-pressure readings worldwide ("120 over 80") and intraocular pressure in ophthalmology. The mmHg is numerically almost identical to the torr (1 mmHg ≈ 1.0000007 torr). Barometric atmospheric pressure was historically quoted in mmHg as well — 760 mmHg = 1 atm.
It belongs to the metric measurement system.
Millimeters of Mercury are commonly used in tire inflation, weather reporting, scuba diving, and engineering.
Why Convert Atmospheres to Millimeters of Mercury?
Engineers, mechanics, and scientists frequently need to convert pressure between Atmospheres and Millimeters of Mercury when working with different measurement standards. Tire pressure, blood pressure readings, weather barometric measurements, and industrial process specifications may all use different pressure units depending on the region or discipline. Reliable conversion prevents equipment misuse and ensures safety.
Frequently Asked Questions
How do I convert Atmospheres to Millimeters of Mercury?
A non-SI unit of pressure defined as 101,325 pascals exactly, corresponding to standard sea-level atmospheric pressure. To convert Atmospheres to Millimeters of Mercury, multiply by 760.002. For example, 25 atm equals 19000.1 mmHg.
How many Millimeters of Mercury are in 1 Atmosphere?
There are 760.002 Millimeters of Mercury in 1 Atmosphere.
How many Atmospheres are in 1 Millimeters of Mercury?
There are 0.00131579 Atmospheres in 1 Millimeters of Mercury.
What is the formula for Atmosphere to Millimeters of Mercury conversion?
The formula is: multiply by 760.002. This means 1 atm = 760.002 mmHg.
Is a Atmosphere bigger than a Millimeters of Mercury?
No. One Atmosphere is smaller than one Millimeters of Mercury because 1 atm equals 760.002 mmHg, which is greater than 1.
When do you need to convert between Atmospheres and Millimeters of Mercury?
A unit of pressure historically defined as the pressure exerted by a 1-millimeter column of mercury at standard gravity. Atmosphere and Millimeters of Mercury are both pressure units, so conversion comes up whenever one source of information uses one unit and another uses the other — a classic cross-reference challenge in engineering, trade, travel, and everyday life.