1 atm = 760 mmHg (torr method)
1 mmHg = 133.322387415 Pa (Pa-based)
Generated at: 2026-01-26 05:01 (Asia/Karachi)
Converter
Result
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Uses torr method by default.
Inverse
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Quick check: applying inverse returns the input approximately.
Batch conversion
Batch uses current direction, method, and rounding.
History
0 entries
| # | Input | From | To | Result | Method | Rounding | Note | Timestamp |
|---|
Example data
| mmHg | atm (torr method) | atm (Pa-based) |
|---|---|---|
| 760 | 1 | 1.000000 |
| 500 | 0.657895 | 0.657895 |
| 1520 | 2.000000 | 2.000000 |
| 50 | 0.065789 | 0.065789 |
These examples use default rounding shown above.
Formula used
Torr method (exact by definition of torr): atm = mmHg / 760 mmHg = atm × 760 Pa-based exact mmHg: Given 1 mmHg = 133.322387415 Pa and 1 atm = 101325 Pa, atm = mmHg × (133.322387415 / 101325) mmHg = atm × (101325 / 133.322387415)
The torr equals exactly 1/760 of a standard atmosphere. The conventional mmHg differs negligibly from the torr; Pa-based definition tracks SI pressure with higher exactness.
How to use this converter
- Select mmHg → atm or atm → mmHg.
- Choose a method: torr equivalence or Pa-based exact mmHg.
- Enter a value, choose rounding, and press Convert.
- Optional: add a brief note; results appear in history.
- Use Batch conversion for multiple values at once.
- Export your history as CSV or print to PDF.
Tip: Use the inverse panel as a quick sanity check. If rounding is heavy, the inverse may not reproduce the input exactly.
Common conversions and reference pressures
| Context | mmHg | atm | Notes |
|---|---|---|---|
| Standard atmosphere (definition) | 760 | 1.000000 | By torr method: 1 atm = 760 mmHg exactly |
| Average sea‑level air pressure | 760 | ~1.000000 | Typical meteorological reference |
| High-altitude example | 600 | 0.789474 | Approximate 2,000–3,000 m elevation |
| Clinical systolic pressure | 120 | 0.157895 | 120 mmHg ≈ 0.157895 atm |
| Clinical diastolic pressure | 80 | 0.105263 | 80 mmHg ≈ 0.105263 atm |
| Vacuum example | 10 | 0.013158 | Rough vacuum region |
Values are illustrative; use your instrument’s requirements for critical work.
Method comparison: torr vs Pa-based (percent difference)
| mmHg | atm (torr) | atm (Pa-based) | Difference (%) |
|---|---|---|---|
| 50 | 0.065789474 | 0.065789483 | 0.000014 |
| 500 | 0.657894737 | 0.657894831 | 0.000014 |
| 760 | 1.000000000 | 1.000000142 | 0.000014 |
| 1520 | 2.000000000 | 2.000000285 | 0.000014 |
Differences are tiny but can matter in calibration, metrology, and reporting.
Unit facts & relationships
Fundamental equalities
- 1 atm = 760 mmHg (torr method)
- 1 atm = 101,325 Pa
- 1 mmHg = 133.322387415 Pa
Convenient factors
- 1 mmHg ≈ 0.001315789 atm
- 1 kPa ≈ 0.009869233 atm
- 1 kPa ≈ 7.500615758 mmHg
Use tips
- Pick method that matches your standard.
- Record rounding mode with results.
- Include instrument and temperature notes.