Convert PSI to Torr
Convert PSI to Torr for vacuum and lab contexts using the exact 51.7149 factor.
How to Convert Psi to Torr
To convert PSI to Torr, multiply psi by 51.7149.
Conversion Formula:
value * 51.7149Understanding the Conversion
PSI to Torr bridges Imperial pressures to the Torr scale used in vacuum and laboratory settings. Multiply psi by 51.7149. For example, 14.7 psi ≈ 760 Torr (atmosphere), and 1 psi ≈ 51.7 Torr. This is useful when gauges or specs in psi must be interpreted in Torr for vacuum processes.
The conversion is linear and reversible. To go back to psi, divide Torr by 51.7149.
Conversion Examples
Example: Convert 14.7 psi to Torr
- Step 1: 14.7 × 51.7149 ≈ 760.
- Step 2: Result ≈ 760 Torr.
- Step 3: Matches 1 atmosphere.
14.7 psi ≈ 760 Torr
Atmospheric reference.
Example: Convert 1 psi to Torr
- Step 1: 1 × 51.7149 = 51.7149.
- Step 2: Result ≈ 51.7 Torr.
- Step 3: Shows single-psi equivalence.
1 psi ≈ 51.7 Torr
Direct psi to Torr conversion.
Example: Convert 5 psi to Torr
- Step 1: 5 × 51.7149 ≈ 258.57.
- Step 2: Result ≈ 258.6 Torr.
- Step 3: Midrange vacuum reference.
5 psi ≈ 258.6 Torr
Useful for rough-to-medium vacuum levels.
Conversion Formula
Since 760 Torr equals 14.7 psi (1 atmosphere), each psi corresponds to 760/14.7 ≈ 51.7149 Torr.
Conversion Chart
| Psi | Torr |
|---|---|
| 1 | 51.71 |
| 2 | 103.43 |
| 5 | 258.57 |
| 10 | 517.15 |
| 14.7 | 760 |
| 20 | 1034.3 |
| 30 | 1551.4 |
| 50 | 2585.7 |
| 75 | 3878.6 |
| 100 | 5171.5 |
Quick Conversion Tip
psi × 52 ≈ Torr for a quick check; use 51.7149 for exact.
Unit Definitions
Pound per Square Inch (psi)
Imperial pressure unit.
1 psi ≈ 51.7149 Torr; 1 atm = 14.7 psi = 760 Torr.
Torr (Torr)
Vacuum-related unit (1/760 of an atmosphere).
Torr to psi divide by 51.7149; Torr to kPa divide by 7.50062; Torr to Pa multiply by 133.322.
Common Use Cases
- Vacuum processes: present psi data in Torr for operators.
- Laboratory instruments: align psi readings to Torr-based specifications.
- Education: connect Imperial units to vacuum-centric scales.
- Calibration: check psi gauges against Torr references.
Frequently Asked Questions
Is 51.7149 exact?
It is the standard precise factor based on 1 atm = 14.7 psi = 760 Torr.
Why convert to Torr?
Torr is standard in vacuum and some lab specs; converting avoids misinterpretation when psi-only gauges are used.
How do I get back to psi?
Divide Torr by 51.7149 to return to psi.