Convert Atmospheres to Pounds per square inch
1 standard atmosphere is 14.695949 psi. One standard atmosphere is exactly 14.6959487755 pounds per square inch.
One standard atmosphere is 14.695949 pounds per square inch. To convert atmospheres to pounds per square inch, multiply by 14.695949; to go the other way, divide by 14.695949 or multiply by 0.068045964. The factor is exact rather than rounded: it follows from NIST Special Publication 811.
Factor checked against the defining standard · How we check
- Atmospheres × 14.695949
value * 14.695948775514.696 psi
1 standard atmosphere in every pressure unit
| Unit | Value | Exact factor |
|---|---|---|
| pounds per square inch | 14.69594878 psi | × 14.6959487755 |
| bars | 1.01325 bar | × 1.01325 |
| pascals | 101,325 Pa | × 101,325 |
| kilopascals | 101.325 kPa | × 101.325 |
| megapascals | 0.101325 MPa | × 0.101325 |
| atmospheres (as entered) | 1 atm | — |
| torr | 760 Torr | × 760 |
| inches of mercury | 29.9212524 inHg | × 29.9212524019 |
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 atmospheres to pounds per square inch?
- 1.Take the measurement in atmospheres.
- 2.Multiply by 14.695949 — that is how many pounds per square inch fit in one standard atmosphere.
- 3.To go back the other way, divide by 14.695949, or multiply by 0.068045964.
Worked example: 25 atmospheres to pounds per square inch
- Formula
- atm × 14.695949 = psi
- Arithmetic
- 25 × 14.695949 = 367.398719 psi
- Answer
- 25 atm = 367.398719 psi
The factor is rounded for display; the figure above is computed from the full value.
Atmospheres to pounds per square inch conversion table
| Atmospheres | Pounds per square inch |
|---|---|
| 1 atm | 14.695949 psi |
| 2 atm | 29.391898 psi |
| 3 atm | 44.087846 psi |
| 4 atm | 58.783795 psi |
| 5 atm | 73.479744 psi |
| 6 atm | 88.175693 psi |
| 7 atm | 102.871641 psi |
| 8 atm | 117.56759 psi |
| 9 atm | 132.263539 psi |
| 10 atm | 146.959488 psi |
| 12 atm | 176.351385 psi |
| 15 atm | 220.439232 psi |
| 20 atm | 293.918976 psi |
| 25 atm | 367.398719 psi |
| 50 atm | 734.797439 psi |
| 100 atm | 1,469.594878 psi |
| 200 atm | 2,939.189755 psi |
| 300 atm | 4,408.784633 psi |
| 500 atm | 7,347.974388 psi |
| 1000 atm | 14,695.948776 psi |
| 2000 atm | 29,391.897551 psi |
| 5000 atm | 73,479.743878 psi |
| 10000 atm | 146,959.487755 psi |
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.
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.
How many pounds per square inch are in a standard atmosphere?
One standard atmosphere is 14.695949 pounds per square inch. Going the other way, one pound per square inch is 0.068045964 atmospheres. 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 pounds per square inch are in a standard atmosphere?
- 14.695949. 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.
- How do I convert pounds per square inch back to atmospheres?
- Divide by 14.695949, or multiply by 0.068045964 — they are the same operation.
Other pressure conversions
Pounds per square inch to atmospheres — the same conversion the other way.