Pounds per square inch (psi)
The pound per square inch (psi) is the unit of pressure used in the United States for tire pressures, air compressors, water systems and engineering.
Convert pounds per square inch to any pressure unit
1 pound per square inch = 0.06894757293 bars
Quick facts
- Unit
- Pound per square inch (plural: pounds per square inch)
- Symbol
- psi
- Measures
- Pressure / Stress
- System
- US & imperial
- Equals
- 6,894.75729317 pascals
- Definition
- One pound-force per square inch (about 6,894.76 Pa).
- Also written
- lbf/in², psia
1 pound per square inch in other units
| Bars | 0.06894757293 bar |
| Kilopascals | 6.894757293 kPa |
| Pascals | 6,894.757293 Pa |
| Standard atmospheres | 0.06804596391 atm |
| Millimeters of mercury | 51.7149252 mmHg |
| Hectopascals | 68.94757293 hPa |
| Megapascals | 0.006894757293 MPa |
| Inches of mercury | 2.036020677 inHg |
What is a pound per square inch?
The pound per square inch (psi) is the unit of pressure used in the United States for tire pressures, air compressors, water systems and engineering. It is the force of one pound on one square inch, about 6.895 kPa. Atmospheric pressure is about 14.7 psi.
Most gauges show pressure relative to the atmosphere (psig); absolute pressure is psia. This page is psi as absolute or as a plain difference; see psig for gauge readings.
Where the pound per square inch sits among pressure units
The pound per square inch is number 25 of 44 on our scale of pressure units, ordered from smallest to largest.
What pounds per square inch are used for
- Tire pressure in the US (30–35 psi for cars)
- Air compressors and pneumatic tools
- Water pressure in homes (40–80 psi)
- Engineering and material strength (ksi)
Pounds per square inch in real life
- A car tire is typically 32–35 psi
- Home water pressure is 40–80 psi
- A road bike tire is 80–120 psi
- A scuba tank is filled to about 3,000 psi
Top pound per square inch conversions
- Pounds per square inch to bars
- Pounds per square inch to kilopascals
- Pounds per square inch to pascals
- Pounds per square inch to standard atmospheres
- Pounds per square inch to millimeters of mercury
- Pounds per square inch to hectopascals
- Pounds per square inch to megapascals
- Pounds per square inch to inches of mercury
- Pounds per square inch to millibars
- Pounds per square inch to centimeters of water
- Pounds per square inch to inches of water
- Pounds per square inch to torr
Common amounts of pounds per square inch
- 0.1 psi
- 0.2 psi
- 0.3 psi
- 0.4 psi
- 0.5 psi
- 0.6 psi
- 0.7 psi
- 0.8 psi
- 0.9 psi
- 1 psi
- 1.5 psi
- 2 psi
- 2.5 psi
- 3 psi
- 3.5 psi
- 4 psi
- 4.5 psi
- 5 psi
- 6 psi
- 7 psi
- 7.5 psi
- 8 psi
- 9 psi
- 10 psi
- 11 psi
- 12 psi
- 13 psi
- 14 psi
- 15 psi
- 16 psi
- 17 psi
- 18 psi
- 19 psi
- 20 psi
- 21 psi
- 22 psi
- 23 psi
- 24 psi
- 25 psi
- 26 psi
- 27 psi
- 28 psi
- 29 psi
- 30 psi
- 31 psi
- 32 psi
- 33 psi
- 34 psi
- 35 psi
- 36 psi
- 37 psi
- 38 psi
- 39 psi
- 40 psi
- 41 psi
- 42 psi
- 43 psi
- 44 psi
- 45 psi
- 46 psi
- 47 psi
- 48 psi
- 49 psi
- 50 psi
- 51 psi
- 52 psi
- 53 psi
- 54 psi
- 55 psi
- 56 psi
- 57 psi
- 58 psi
- 59 psi
- 60 psi
- 61 psi
- 62 psi
- 63 psi
- 64 psi
- 65 psi
- 66 psi
- 67 psi
- 68 psi
- 69 psi
- 70 psi
- 71 psi
- 72 psi
- 73 psi
- 74 psi
- 75 psi
- 76 psi
- 77 psi
- 78 psi
- 79 psi
- 80 psi
- 81 psi
- 82 psi
- 83 psi
- 84 psi
- 85 psi
- 86 psi
- 87 psi
- 88 psi
- 89 psi
- 90 psi
- 91 psi
- 92 psi
- 93 psi
- 94 psi
- 95 psi
- 96 psi
- 97 psi
- 98 psi
- 99 psi
- 100 psi
- 110 psi
- 120 psi
- 130 psi
- 140 psi
- 150 psi
- 160 psi
- 170 psi
- 180 psi
- 190 psi
- 200 psi
- 210 psi
- 220 psi
- 230 psi
- 240 psi
- 250 psi
- 260 psi
- 270 psi
- 280 psi
- 290 psi
- 300 psi
- 310 psi
- 320 psi
- 330 psi
- 340 psi
- 350 psi
- 360 psi
- 370 psi
- 380 psi
- 390 psi
- 400 psi
- 410 psi
- 420 psi
- 430 psi
- 440 psi
- 450 psi
- 460 psi
- 470 psi
- 480 psi
- 490 psi
- 500 psi
- 600 psi
- 700 psi
- 800 psi
- 900 psi
- 1,000 psi
- 1,200 psi
- 1,500 psi
- 2,000 psi
- 2,500 psi
- 3,000 psi
- 4,000 psi
- 5,000 psi
- 10,000 psi
Convert pounds per square inch to all 45 other units
Metric (SI)
- psi to bar
- psi to kPa
- psi to Pa
- psi to hPa
- psi to MPa
- psi to mbar
- psi to GPa
- psi to barg
- psi to kbar
- psi to dbar
- psi to cbar
- psi to µbar
Atmospheres & mercury
Water column
US & imperial
Gravitational metric & CGS
Scientific
Convert to pounds per square inch
- Bars to pounds per square inch
- Kilopascals to pounds per square inch
- Pascals to pounds per square inch
- Standard atmospheres to pounds per square inch
- Millimeters of mercury to pounds per square inch
- Hectopascals to pounds per square inch
- Megapascals to pounds per square inch
- Inches of mercury to pounds per square inch
- Millibars to pounds per square inch
- Centimeters of water to pounds per square inch
- Inches of water to pounds per square inch
- Torr to pounds per square inch
Frequently asked questions
What is a pound per square inch?
The pound per square inch (psi) is the unit of pressure used in the United States for tire pressures, air compressors, water systems and engineering.
How is the pound per square inch defined?
One pound-force per square inch (about 6,894.76 Pa).
How many bars are in a pound per square inch?
One pound per square inch equals 0.06894757293 bars.
How many kilopascals are in a pound per square inch?
One pound per square inch equals 6.894757293 kilopascals.
How many pascals are in a pound per square inch?
One pound per square inch equals 6,894.757293 pascals.