Convert Pounds per square inch to Atmospheres
1 pound per square inch is 0.068046 atm. One pound per square inch is exactly 0.0680459639099 atmospheres.
One pound per square inch is 0.068045964 atmospheres. To convert pounds per square inch to atmospheres, multiply by 0.068045964; to go the other way, divide by 0.068045964 or multiply by 14.695949. The factor is exact rather than rounded: it follows from NIST Special Publication 811. A pound-force spread over a square inch.
Factor checked against the defining standard · How we check
- Pounds per square inch × 0.068045964
value * 0.06804596390990.068 atm
1 pound per square inch in every pressure unit
| Unit | Value | Exact factor |
|---|---|---|
| pounds per square inch (as entered) | 1 psi | — |
| bars | 0.06894757293 bar | × 0.0689475729317 |
| pascals | 6,894.757293 Pa | × 6,894.75729317 |
| kilopascals | 6.894757293 kPa | × 6.89475729317 |
| megapascals | 0.006894757293 MPa | × 0.00689475729317 |
| atmospheres | 0.06804596391 atm | × 0.0680459639099 |
| torr | 51.71493257 Torr | × 51.7149325715 |
| inches of mercury | 2.036020461 inHg | × 2.03602046108 |
Factors are entered by hand from NIST Special Publication 811 rather than derived from a units library, so the ones that terminate are exact rather than rounded.
How do you convert pounds per square inch to atmospheres?
- 1.Take the measurement in pounds per square inch.
- 2.Multiply by 0.068045964 — that is how many atmospheres fit in one pound per square inch.
- 3.To go back the other way, divide by 0.068045964, or multiply by 14.695949.
Worked example: 25 pounds per square inch to atmospheres
- Formula
- psi × 0.068045964 = atm
- Arithmetic
- 25 × 0.068045964 = 1.701149 atm
- Answer
- 25 psi = 1.701149 atm
The factor is rounded for display; the figure above is computed from the full value.
Pounds per square inch to atmospheres conversion table
| Pounds per square inch | Atmospheres |
|---|---|
| 1 psi | 0.068046 atm |
| 2 psi | 0.136092 atm |
| 3 psi | 0.204138 atm |
| 4 psi | 0.272184 atm |
| 5 psi | 0.34023 atm |
| 6 psi | 0.408276 atm |
| 7 psi | 0.476322 atm |
| 8 psi | 0.544368 atm |
| 9 psi | 0.612414 atm |
| 10 psi | 0.68046 atm |
| 12 psi | 0.816552 atm |
| 15 psi | 1.020689 atm |
| 20 psi | 1.360919 atm |
| 25 psi | 1.701149 atm |
| 50 psi | 3.402298 atm |
| 100 psi | 6.804596 atm |
| 200 psi | 13.609193 atm |
| 300 psi | 20.413789 atm |
| 500 psi | 34.022982 atm |
| 1000 psi | 68.045964 atm |
| 2000 psi | 136.091928 atm |
| 5000 psi | 340.22982 atm |
| 10000 psi | 680.459639 atm |
What is a pound per square inch?
A pound-force spread over a square inch. Exact, because both parts are: it is 4.4482216152605 newtons divided by an inch squared. Every US tyre gauge, air line and pressure washer is marked in it.
What is a standard atmosphere?
Exactly 101,325 pascals by definition, not by measurement — it was fixed as a reference, and the real pressure outside your window is never precisely it.
How many atmospheres are in a pound per square inch?
One pound per square inch is 0.068045964 atmospheres. Going the other way, one standard atmosphere is 14.695949 pounds per square inch. Both figures come from the same defined relation rather than from a measurement, which is why they are the same today as they were in 1959.
Every pressure unit here
| Unit | Symbol | One of these is |
|---|---|---|
| Pounds per square inch | psi | 6894.7573 pascal |
| Bars | bar | 100000 pascal |
| Pascals | Pa | the base unit |
| Kilopascals | kPa | 1000 pascal |
| Megapascals | MPa | 1000000 pascal |
| Atmospheres | atm | 101325 pascal |
| Torr | Torr | 133.32237 pascal |
| Inches of mercury | inHg | 3386.389 pascal |
Questions people actually ask
- How many atmospheres are in a pound per square inch?
- 0.068045964. Exactly 101,325 pascals by definition, not by measurement — it was fixed as a reference, and the real pressure outside your window is never precisely it.
- How do I convert atmospheres back to pounds per square inch?
- Divide by 0.068045964, or multiply by 14.695949 — they are the same operation.
Other pressure conversions
Atmospheres to pounds per square inch — the same conversion the other way.