Psi to atmospheres
Type a value in psi to see it in atmospheres straight away, or type in the second box to convert back.
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How to use it
- Type the value in the psi box.
- Read the result in atmospheres as you type, and pick the precision you need.
- Swap the direction to convert back, or copy the result.
How it is calculated
atm = psi × 0.06804596391
Multiply the value in psi by 0.06804596391 to get atmospheres.
Example
To convert 25 psi to atmospheres: 25 × 0.06804596391 = 1.70115 atm.
Conversion table
| Psi (psi) | Atmospheres (atm) |
|---|---|
| 1 | 0.068046 |
| 2 | 0.136092 |
| 3 | 0.204138 |
| 5 | 0.34023 |
| 10 | 0.68046 |
| 20 | 1.36092 |
| 25 | 1.70115 |
| 50 | 3.4023 |
| 100 | 6.8046 |
| 250 | 17.0115 |
| 500 | 34.023 |
| 1,000 | 68.046 |
About the units
- Psi
- One pound-force per square inch, about 6894.757 pascals from the exact definitions of the pound, inch and standard gravity.
- Atmosphere
- The standard atmosphere, defined as exactly 101,325 pascals.
Limits and caveats
- Results are rounded for display and computed with the browser's floating point precision (about 15 significant digits).
- Both unit factors are exact by their official definitions.
Questions about this tool
How many atmospheres are in one psi?
1 psi = 0.068046 atm exactly.
How do I convert psi to atmospheres?
Use atm = psi × 0.06804596391. For example, 25 psi = 1.70115 atm.
How many psi are in one atmosphere?
1 atm = 14.6959 psi.
What is the difference between gauge and absolute pressure?
Gauge pressure is measured from the surrounding air pressure, while absolute pressure starts from a perfect vacuum. These converters change the unit only, so a gauge reading stays a gauge reading.
Are torr and mmHg the same?
Almost. One torr is 101325/760 Pa, about 133.322368 Pa, and one conventional mmHg is 133.322387 Pa, a difference of less than one part per million. For everyday use you can treat them as equal.