PSI to Torr Conversion Chart
| Pound per square inch (psi) | Torr (mmHg) (mmHg) | Reference Benchmark | Formula Step |
|---|---|---|---|
| 0.1 psi | 5.171492 mmHg | Differential Low Pressure Sensor Working Air Range | 0.1 × 51.71492 = 5.171492 torr |
| 0.01933678 psi | 1 mmHg | Exact One Torr Classical Mercury Unit Standard in PSI | 0.01933678 × 51.71492 = 1 torr |
| 0.2 psi | 10.34298 mmHg | Laboratory Cleanroom Ventilation Air Differential | 0.2 × 51.71492 = 10.34298 torr |
| 0.5 psi | 25.85746 mmHg | Low-Pressure Natural Gas Household Delivery Manifold | 0.5 × 51.71492 = 25.85746 torr |
| 1 psi | 51.71492 mmHg | Standard Imperial One Pound Per Square Inch Unit | 1 × 51.71492 = 51.71492 torr |
| 2 psi | 103.4298 mmHg | Inflatable Boat Collar Hull Operational Working Pressure | 2 × 51.71492 = 103.4298 torr |
| 2.3206 psi | 120 mmHg | Standard Healthy Human Systolic Blood Pressure Level | 2.3206 × 51.71492 = 120 torr |
| 5 psi | 258.5746 mmHg | Residential Low-Pressure Steam Boiler Chamber Level | 5 × 51.71492 = 258.5746 torr |
| 10 psi | 517.1492 mmHg | Domestic Garden Sprinkler Head Hydrostatic Supply | 10 × 51.71492 = 517.1492 torr |
| 14.69595 psi | 760 mmHg | Standard Sea Level Earth Barometric Air Baseline | 14.69595 × 51.71492 = 760 torr |
| 15 psi | 775.7238 mmHg | Near-Atmospheric General Engineering Pressure Baseline | 15 × 51.71492 = 775.7238 torr |
| 20 psi | 1034.298 mmHg | Lawn Tractor Pneumatic Turf Tire Inflation Pressure | 20 × 51.71492 = 1034.298 torr |
| 30 psi | 1551.448 mmHg | Compact Passenger Vehicle Recommended Cold Tire Inflation | 30 × 51.71492 = 1551.448 torr |
| 50 psi | 2585.746 mmHg | Domestic Potable Well Water Pump Cut-Off Switch Level | 50 × 51.71492 = 2585.746 torr |
| 100 psi | 5171.492 mmHg | Workshop Pneumatic Airline Tool Operating Pressure | 100 × 51.71492 = 5171.492 torr |
Pound per square inch to Torr (mmHg) Formula & Unit Definitions
The exact relationship derives from absolute SI standards: 1 psi equals 6,894.75729 pascals, and 1 torr equals 101,325 ÷ 760 ≈ 133.322368 pascals. Dividing 6,894.757 by 133.3224 yields approximately 51.71491958 torr per psi. To convert psi to torr, multiply the psi value by 51.71492 (or divide by 0.01933678). To convert torr back to psi, multiply the torr figure by 0.01933678 (or divide by 51.71492).
Quick Estimation: Multiply the psi value by 50, then add about 3.5%. For example, 2 psi × 50 = 100 + 3.5 = 103.5 torr (exact is 103.43 torr); 10 psi × 50 = 500 + 17 = 517 torr (exact is 517.15 torr).
Pounds per Square Inch (psi)
Imperial Engineering Baseline- Creator & Origin: Standardized in Britain and North America during the 19th-century Industrial Revolution.
- Standard Definition: Defined as one avoirdupois pound-force acting perpendicular to one square inch of area.
- Everyday Focus: Vehicle tire inflation, air compressors, pneumatic machinery, and building water pressure.
Torr Standard (Torr / mmHg)
Classical Vacuum Baseline- Creator & Origin: Named in honor of Evangelista Torricelli, who constructed the first liquid mercury barometer in 1643.
- Standard Definition: Defined as exactly 1/760 of a standard atmosphere (101,325 ÷ 760 ≈ 133.3224 Pa).
- Everyday Focus: Sublimation freeze-drying, vacuum metallurgy, analytical spectrometry, and blood pressure (mmHg).
Frequently Asked Questions
Q.How many torr are in one psi?
One psi equals approximately 51.71492 torr (or mmHg).
Q.What is the reverse conversion from torr to psi?
To convert back, use the Torr to PSI Converter where 1 torr equals ~0.019337 psi.
Q.What is 14.7 psi in torr?
14.696 psi equals exactly 760 torr (standard atmospheric pressure at sea level).
Q.What is 1 psi in mmHg?
Because 1 torr equals 1 mmHg, 1 psi equals approximately 51.71 mmHg.
Q.How do you convert psi to torr mentally?
Multiply your psi figure by 50 and add about 3.4% (e.g. 2 psi × 50 = 100, plus 3.4 = 103.4 torr).