PSI Conversion Calculator
Convert psi to bar, kPa, MPa, ksi, atm, inHg, mmHg, torr, psf, and kg/cm², in both directions. Exact working constant: 1 psi = 6,894.757293168 Pa.
Converter
Show-your-work appears above for every conversion.
1 PSI Equals (Quick Chart)
Use this psi conversion chart for quick psi to kPa, psi to bar, psi to atm, psi to torr, and psi to ksi lookups.
| Unit | 1 psi = |
|---|---|
| kPa | 6.894757 |
| MPa | 0.006894757 |
| bar | 0.06894757 |
| atm | 0.06804596 |
| inHg | 2.036020 |
| mmHg | 51.71493 |
| torr | 51.71493 |
| psf | 144.0000 |
| ksi | 0.001000 |
| kgf/cm² | 0.07030696 |
PSI Benchmark Table
| psi | kPa | bar | atm |
|---|---|---|---|
| 1 | 6.89 | 0.0689 | 0.06805 |
| 5 | 34.47 | 0.3447 | 0.34023 |
| 10 | 68.95 | 0.6895 | 0.68046 |
| 14.7 | 101.35 | 1.0135 | 1.00028 |
| 25 | 172.37 | 1.7237 | 1.70115 |
| 30 | 206.84 | 2.0684 | 2.04138 |
| 50 | 344.74 | 3.4474 | 3.40230 |
| 75 | 517.11 | 5.1711 | 5.10345 |
| 100 | 689.48 | 6.8948 | 6.80460 |
| 150 | 1,034.21 | 10.3421 | 10.20689 |
Worked Examples
14.7 psi × 6.894757293168 = 101.353 kPaStandard atmospheric pressure: 14.7 psi is about 101.3 kPa.
100 psi × 0.06894757293168 = 6.89476 barBike tire / high-pressure line: 100 psi is about 6.89 bar.
30 psi × 0.06894757293168 = 2.06843 barCar tire: 30 psi is about 2.07 bar.
101,325 Pa ÷ 6,894.757293168 = 14.6959 psiOne standard atmosphere is about 14.696 psi.
Formula
The psi conversion formula pivots through pascals. Primary definitions:
1 psi = 1 lbf / 1 in² = 4.4482216152605 N / 0.00064516 m² = 6,894.757293168 Pa · 1 atm = 101,325 Pa · 1 bar = 100,000 Pa · 1 inHg = 3,386.389 Pa
To convert any unit A to any unit B: value × (Pa per A) ÷ (Pa per B).
Scope Boundary
This hub converts pure pressure units with psi as the pivot (psi ↔ bar, kPa, MPa, ksi, atm, inHg, mmHg, torr, psf, kgf/cm², Pa), both directions.
Related tools with their own scope:
- bar-to-psi-conversion (#840): bar-pivot spoke for bar ↔ psi workflows.
- kg-cm2-to-psi-converter (#912): kgf/cm²-pivot spoke.
- kpa-to-psi-conversion (#922): kPa-pivot hub (kPa, psi, bar, mmHg, atm, Pa).
- ksi-to-psi-conversion (#924): ksi-pivot converter for material strengths.
- ksi-to-mpa-conversion (#923): ksi-pivot 6-unit hub (ksi, MPa, psi, kPa, GPa, Pa).
- lbs-to-psi (#932): NOT a unit converter — it computes psi = force ÷ area and needs an area input.
#971 mpa-to-psi-conversion was killed pre-build as a duplicate of #923; its keywords were absorbed there.
FAQ
What is psi?
PSI stands for pounds per square inch, the imperial unit of pressure. One psi is the pressure of one pound-force applied over one square inch, 6,894.757293168 pascals (rounded to 9 decimals). It is the standard pressure unit in the United States for tire pressure, air compressors, and hydraulics.
How do I convert psi to bar?
Multiply psi by 0.06894757293168. For example, 100 psi × 0.06894757293168 = 6.89476 bar, and 30 psi = 2.06843 bar. To go the other way, multiply bar by 14.503773773.
How do I convert psi to kPa?
Multiply psi by 6.894757293168. For example, 14.7 psi × 6.894757293168 = 101.353 kPa, which is why standard atmospheric pressure (14.7 psi) equals about 101.3 kPa. For kPa to psi, divide kPa by 6.894757293168.
How many psi are in 1 bar?
One bar equals 14.503773773 psi. So a typical car tire at 2.2 bar is about 31.9 psi, and 1 bar is also exactly 100 kPa.
How many psi are in 1 atm?
One standard atmosphere equals 14.6959487755 psi. Standard atmospheric pressure is defined as 101,325 Pa, which is 14.696 psi or 1.01325 bar.
What is the exact value of 1 psi in pascals?
By definition 1 psi = 1 lbf/in² = 6,894.757293168 Pa when rounded to 9 decimals. The exact quotient 4.4482216152605 / 0.00064516 continues as 6,894.7572931683613... Pa, so 6,894.757293168 Pa is the standard working constant used by converters including this one.
How do I convert bar to psi?
Multiply bar by 14.503773773. For example, 2.5 bar × 14.503773773 = 36.2594344325 psi. This converter works in both directions for all 12 units.
How do I convert psi to MPa?
Multiply psi by 0.006894757293168, or divide by 145.03773773. For example, 100 psi = 0.68947573 MPa, and 1 MPa = 145.03773773 psi.
What is the difference between psi, psia, and psig?
PSI alone is ambiguous. PSIA is absolute pressure measured against a perfect vacuum, while PSIG is gauge pressure measured relative to the atmosphere. They differ by about 14.7 psi: 0 psig = 14.7 psia at sea level. Unit conversion factors are identical; only the reference point changes.
How do I convert psi to inHg?
Multiply psi by 2.036020. For example, 14.7 psi = 29.9295 inHg. Standard sea-level pressure (1 atm = 14.6959 psi) reads about 29.92 inches of mercury on a barometer. One inHg equals 0.491154 psi.
What is the difference between mmHg and torr?
Almost nothing: they differ by less than 0.00002 percent. One torr is defined as exactly 101,325/760 Pa (133.3223684211 Pa), while one conventional mmHg is defined as exactly 133.322387415 Pa. For any practical gauge they are interchangeable, but this converter keeps them as separate units for exactness.
How do I convert psi to psf?
Multiply psi by exactly 144, because one square foot contains 144 square inches. So 1 psi = 144 psf, and 10 psi = 1,440 psf. Divide psf by 144 to get psi.
How many psi is 1 kg/cm²?
One kilogram-force per square centimeter equals 14.223343307 psi. Conversely, 1 psi = 0.07030696 kg/cm². This unit is common on Japanese and older European pressure gauges.
Is kPa the same as psi?
No. Kilopascals are the metric SI pressure unit and psi is imperial. One psi equals 6.894757293168 kPa, so a 32 psi car tire is 220.632 kPa. Never substitute one for the other without converting.
Why is tire pressure measured in psi?
The United States standardized on imperial units, so tire placards, gauges, and compressors there read in psi. A typical sedan tire is 32 psi, which equals 220.632 kPa or 2.2063 bar. Always follow the vehicle placard, not the tire sidewall maximum.
Can I convert pounds (lbs) to psi with this tool?
No. Pounds measure force and psi measures pressure, so converting needs the area: psi = pounds ÷ square inches. Use the dedicated lbs-to-psi calculator, which asks for force and area, instead of this pure unit converter.
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