ATM Pressure Converter
Convert atmospheres (atm) to and from Pascals, kPa, bar, psi, mmHg, Torr, and inHg. Bidirectional conversion with preset values, reference table, and quick formulas.
mmHg to ATM Converter
Convert between millimeters of mercury and atmospheres for medical, scientific, and weather applications.
mmHg
Atmospheres (atm)⧉
0.00 atm
Converted from mmHg
Kilopascals (kPa) ⧉
0.13 kPa
Converted from mmHg
Bar⧉
0.00 bar
Converted from mmHg
Pascals (Pa)⧉
133.32 Pa
Converted from mmHg
Conversion Table
| mmHg | atm | kPa | bar | Pa |
|---|---|---|---|---|
| 0.01 | 0.00 | 0.00 | 0.00 | 1.33 |
| 0.10 | 0.00 | 0.01 | 0.00 | 13.33 |
| 0.50 | 0.00 | 0.07 | 0.00 | 66.66 |
| 1.00 | 0.00 | 0.13 | 0.00 | 133.32 |
| 2.00 | 0.00 | 0.27 | 0.00 | 266.64 |
| 5.00 | 0.01 | 0.67 | 0.01 | 666.61 |
| 10.00 | 0.01 | 1.33 | 0.01 | 1,333.22 |
| 50.00 | 0.07 | 6.67 | 0.07 | 6,666.10 |
| 100.00 | 0.13 | 13.33 | 0.13 | 13,332.20 |
| 1,000.00 | 1.32 | 133.32 | 1.33 | 133,322.00 |
Quick Formulas
mmHg → atm⧉
atm = mmHg × 760.0021
Conversion factor
atm → kPa⧉
kPa = atm × 0.009869
Conversion factor
kPa → bar⧉
bar = kPa × 100
Conversion factor
bar → Pa⧉
Pa = bar × 0.00001
Conversion factor
Pa → mmHg⧉
mmHg = Pa × 133.322
Conversion factor
Planning notes, formulas, and examples
About the mmHg to ATM Converter
Millimeters of mercury and atmospheres are both pressure units tied to the mercury-barometer tradition. mmHg is common in medicine and some laboratory settings, while atmospheres remain common in chemistry and general reference-pressure discussions.
This converter handles both directions and makes the standard relationship clear: 760 mmHg equals 1 atm. It is useful when a medical or vacuum-style reading needs to be compared with a gas-law or standard-pressure value expressed in atmospheres.
Use it when you need to move between mmHg readings and atm-based reference points without manual division by 760. It also helps when you are checking whether a reading is close to standard atmospheric pressure, comparing a manometer value with a chemistry problem, or translating a textbook atmosphere reference into the mmHg scale used on older instruments and many clinical references. Keeping those units aligned is useful whenever one source is written for clinicians or instrument operators and another is written for chemistry or physics work.
When This Page Helps
mmHg is familiar in blood pressure and mercury-column history, while atmospheres are familiar in chemistry and general pressure reference points. This page bridges those contexts directly, keeps the 760 mmHg = 1 atm anchor visible, and makes it easier to compare a reading with standard atmospheric pressure without doing the division manually each time.
How to Use the Inputs
- Choose mmHg → ATM or ATM → mmHg.
- Enter the pressure value.
- Read the converted result and any supporting units.
- Use presets for standard atmosphere and common medical or lab values.
- Compare the value with 760 mmHg when checking atmospheric-scale pressures.
- Review the examples if you need quick context for the number.
- Use the formula section for manual conversion.
Formula used
ATM = mmHg ÷ 760
mmHg = ATM × 760
1 atm = 760 mmHgExample Calculation
Result: 0.5 atm
380 mmHg divided by 760 equals 0.5 atm, which is half of standard atmospheric pressure.
Tips & Best Practices
- 1 atm equals 760 mmHg.
- Normal blood pressure is often written around 120/80 mmHg, which is far below 1 atm because it is measured as a relative pressure in the circulatory system.
- mmHg remains common because of the historical mercury manometer and sphygmomanometer.
- For quick checks, 76 mmHg is 0.1 atm.
- Torr and mmHg are very close and are often treated similarly in practice.
- Atmospheres are easier for gas-law comparisons; mmHg is easier for medical and mercury-column context.
Mercury-Column Pressure Units
The mmHg unit comes from the height of a mercury column needed to balance a pressure. That history is why it remains familiar in blood pressure measurement and other settings tied to mercury-column instruments.
Why Convert To Atmospheres
Atmospheres are convenient when comparing a pressure with standard ambient conditions or using gas-law relationships. Converting from mmHg to atm is often the quickest way to turn a medical or lab-style number into a general scientific reference pressure.
Context Matters
A number in mmHg may represent blood pressure, chamber pressure, or barometric pressure. The unit alone does not tell you whether the value is gauge or absolute, so always check the measurement context before comparing it with an atmosphere-based calculation.
Sources & Methodology
Last updated:
Frequently Asked Questions
1 atmosphere equals 760 mmHg. That fixed relationship is the basis of the whole conversion.
Divide the mmHg value by 760. For example, 380 mmHg is 0.5 atm.
Multiply atmospheres by 760. For example, 1.2 atm equals 912 mmHg.
It comes from mercury-column instruments and remains the standard way to report blood pressure. Even though modern devices are digital, the unit stayed in common clinical use.
They are extremely close and often treated as interchangeable for practical work, though their formal definitions are slightly different. In most everyday lab or medical calculations, the difference is negligible unless a strict standard requires otherwise.
Standard atmospheric pressure is 760 mmHg. That is the same reference point as 1 atm.
More in this topic
ATM to Pascals Converter
Convert between atmospheres (atm) and Pascals (Pa). Bidirectional converter with kPa, hPa, mbar, and bar outputs, reference table, and preset values.
Bar to ATM Converter
Convert between bar and atmospheres (atm) with bidirectional conversion, PSI/kPa/mmHg equivalents, reference table, and preset values.