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Pressure Unit Converter (PSI, Bar, Pascal, Atm)
Convert a pressure value among PSI, bar, pascal, and standard atmospheres.
Page updated 2026-09-04.
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Pascals
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Standard atmospheric pressure, converted across common units
14.7 psi -- standard atmospheric pressure at sea level -- converts to 1.0135 bar, or equivalently 101,352.93 pascals.
This specific value (14.7 psi, close to exactly 1 atmosphere) is a commonly referenced benchmark precisely because it represents the pressure of Earth's atmosphere at sea level -- useful as a mental reference point when converting or sanity-checking other pressure values, like tire pressure or weather barometric readings.
The conversion runs through pascals as a common intermediate unit: 14.7 psi x 6,894.757 Pa/psi = 101,352.93 Pa, then 101,352.93 Pa / 100,000 Pa/bar = 1.0135 bar -- pascals serve as the SI base unit that every other pressure unit converts to and from.
Why three slightly different 'standard atmosphere' values exist
Factors: 1 psi = 6894.757 Pa, 1 bar = 100000 Pa, 1 atm = 101325 Pa. Notice that 1 atmosphere (101,325 Pa) and this converted result (101,352.93 Pa from 14.7 psi) are close but not identical -- that's because 14.7 psi is itself a commonly used rounded approximation of standard atmospheric pressure, not an exact conversion of 1 atm; the true precise value is closer to 14.696 psi.
Bar and pascal have a clean, simple relationship (1 bar = exactly 100,000 Pa) since both are part of the metric measurement tradition, while psi's conversion factor (6,894.757 Pa) reflects its origin in the imperial pounds-and-inches system, which wasn't designed with round metric conversions in mind.
Pressure units show up across very different contexts using different conventional units -- psi for tire pressure and some industrial specs, bar for many European gauges and some scuba/diving contexts, and pascals (or kilopascals) as the standard SI unit in scientific and engineering work.
Related physical unit conversion tools
For a similarly structured conversion between common temperature scales, the Temperature Unit Converter covers that related physical measurement.
For converting energy quantities across joules, calories, kWh, and BTU, the Energy Unit Converter is a related physics conversion tool.
Frequently Asked Questions (FAQ)
How is 14.7 psi converted to 1.0135 bar?
Factors: 1 psi = 6894.757 Pa, 1 bar = 100000 Pa, 1 atm = 101325 Pa. First to pascals: 14.7 x 6,894.757 = 101,352.93 Pa. Then to bar: 101,352.93 / 100,000 = 1.0135 bar. Pascals serve as the common intermediate unit for any pressure conversion.
Why isn't 14.7 psi exactly equal to 1 atmosphere (101,325 Pa)?
Factors: 1 psi = 6894.757 Pa, 1 bar = 100000 Pa, 1 atm = 101325 Pa. Because 14.7 psi is itself a commonly used rounded approximation of standard atmospheric pressure -- the more precise equivalent is closer to 14.696 psi. This small rounding is why the converted value (101,352.93 Pa) doesn't land exactly on 101,325 Pa.
Why does bar have such a clean conversion to pascals, but psi doesn't?
Bar is part of the metric system (1 bar = exactly 100,000 Pa, a round number), while psi originates from the imperial pounds-and-inches system, which wasn't designed with round metric equivalents in mind -- hence its less clean 6,894.757 Pa conversion factor.
Which pressure unit should I use for tire pressure versus scientific work?
Psi is the common convention for tire pressure and many industrial specs (especially in the US), bar is common on many European pressure gauges and diving contexts, and pascals (or kilopascals) are the standard SI unit used in scientific and engineering contexts.
Is pascal the base unit every other pressure unit converts through?
Factors: 1 psi = 6894.757 Pa, 1 bar = 100000 Pa, 1 atm = 101325 Pa. Yes, pascals are the SI base unit for pressure, and this converter uses pascals as the common intermediate step for converting between any two other pressure units, like psi and bar in this example.
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