Convert Atmospheres to Torr
1 standard atmosphere is 760 Torr. One standard atmosphere is exactly 760 torr.
One standard atmosphere is 760 torr. To convert atmospheres to torr, multiply by 760; to go the other way, divide by 760 or multiply by 0.0013157895. The factor is exact rather than rounded: it follows from NIST Special Publication 811.
Factor checked against the defining standard · How we check
- Atmospheres × 760
value * 760760 Torr
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 torr?
- 1.Take the measurement in atmospheres.
- 2.Multiply by 760 — that is how many torr fit in one standard atmosphere.
- 3.To go back the other way, divide by 760, or multiply by 0.0013157895.
Worked example: 25 atmospheres to torr
- Formula
- atm × 760 = Torr
- Arithmetic
- 25 × 760 = 19,000 Torr
- Answer
- 25 atm = 19,000 Torr
The factor is exact, so this figure is exact too — only the display is rounded.
Atmospheres to torr conversion table
| Atmospheres | Torr |
|---|---|
| 1 atm | 760 Torr |
| 2 atm | 1,520 Torr |
| 3 atm | 2,280 Torr |
| 4 atm | 3,040 Torr |
| 5 atm | 3,800 Torr |
| 6 atm | 4,560 Torr |
| 7 atm | 5,320 Torr |
| 8 atm | 6,080 Torr |
| 9 atm | 6,840 Torr |
| 10 atm | 7,600 Torr |
| 12 atm | 9,120 Torr |
| 15 atm | 11,400 Torr |
| 20 atm | 15,200 Torr |
| 25 atm | 19,000 Torr |
| 50 atm | 38,000 Torr |
| 100 atm | 76,000 Torr |
| 200 atm | 152,000 Torr |
| 300 atm | 228,000 Torr |
| 500 atm | 380,000 Torr |
| 1000 atm | 760,000 Torr |
| 2000 atm | 1,520,000 Torr |
| 5000 atm | 3,800,000 Torr |
| 10000 atm | 7,600,000 Torr |
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 torr?
Exactly one seven-hundred-and-sixtieth of a standard atmosphere. Within a millionth of a millimetre of mercury, which is what it replaced, and still the unit of vacuum work.
How many torr are in a standard atmosphere?
One standard atmosphere is 760 torr, exactly. Going the other way, one torr is 0.0013157895 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 torr are in a standard atmosphere?
- 760. Exactly one seven-hundred-and-sixtieth of a standard atmosphere. Within a millionth of a millimetre of mercury, which is what it replaced, and still the unit of vacuum work.
- How do I convert torr back to atmospheres?
- Divide by 760, or multiply by 0.0013157895 — they are the same operation.
Other pressure conversions
Torr to atmospheres — the same conversion the other way.