Mmhg to Atmospheres Converter
Convert millimetre of mercury to atmosphere instantly. Type a value below — the result updates as you type.
When you need to convert millimetre of mercury to atmosphere
Pressure conversions are used for tyre inflation, weather readings, scuba and industrial gauges, and HVAC work, where gauges and manuals may be calibrated in different units.
Typical values: 0.5 mmHg is about 0.000657895 atm, and 100 mmHg works out to roughly 0.1316 atm. Because the ratio is fixed at 0.0013, you can scale any amount linearly — doubling the mmHg doubles the atmospheres.
A single tyre or gauge spec is often printed in two or three pressure units side by side for international use.
How to convert millimetre of mercury to atmosphere
One millimetre of mercury equals 0.0013 atmospheres. To convert, multiply the number of mmHg by 0.0013:
atmospheres = mmHg × 0.0013
For example, 10 mmHg × 0.0013 = 0.0132 atmospheres.
Mmhg to atmospheres conversion table
| Pressure (mmHg) | Atmospheres (atm) |
|---|---|
| 1 mmHg | 0.0013 atm |
| 2 mmHg | 0.0026 atm |
| 3 mmHg | 0.0039 atm |
| 5 mmHg | 0.0066 atm |
| 10 mmHg | 0.0132 atm |
| 20 mmHg | 0.0263 atm |
| 50 mmHg | 0.0658 atm |
| 100 mmHg | 0.1316 atm |
FAQ
How many atmospheres are in a millimetre of mercury?
One millimetre of mercury = 0.0013 atmospheres.
How do I convert atmospheres back to mmHg?
Divide by 0.0013, or use the atmospheres to mmHg converter.