Pressure Unit Conversion Calculator
Convert any pressure reading instantly between all major engineering, meteorological and medical units, with a full reference table of equivalent values shown at once.
From unit
To unit
Pressure converted through the pascal base unit
- 1
Convert to pascals
1 × 100,000 Pa/bar = 100,000Multiply the input value by the pascal-equivalent of the source unit. - 2
Convert to target unit
100,000 ÷ 6,894.757 = 14.503774
How does this calculator work?
Convert pressure via the pascal: value_to = value_from × (from factor ÷ to factor). Key facts: 1 bar = 100,000 Pa ≈ 14.504 psi; 1 atm = 101,325 Pa = 760 mmHg ≈ 14.696 psi. This calculator converts between 11 units and shows 6 equivalents simultaneously for quick cross-reference.
Formula
How this is calculated
Pressure is force per unit area. The SI base unit is the pascal (Pa), defined as one newton per square metre. Because a pascal is very small, practical work uses larger derived units: kilopascals (kPa), megapascals (MPa), bar, and the standard atmosphere (atm). In the United States, psi (pound per square inch) dominates engineering; meteorology worldwide uses hectopascals (hPa) or millibars; clinical blood-pressure readings use mmHg (millimetres of mercury).
Every pressure unit has a fixed linear factor equal to the number of pascals in one of that unit. For example, 1 bar = 100,000 Pa exactly; 1 atm = 101,325 Pa by definition; 1 psi ≈ 6,894.757 Pa. Converting from one unit to another always goes through the pascal: multiply the input by the from-unit factor to reach pascals, then divide by the to-unit factor. Because the relationship is purely multiplicative, any number of chained conversions is lossless except for the rounding in the psi/mmHg/inHg constants.
The reference table shows six simultaneous equivalents so you can cross-check gauge, weather and lab readings without re-entering values. All values are absolute pressure — gauge pressure (above ambient) requires adding local atmospheric pressure, approximately 101,325 Pa at sea level, before converting.
Frequently asked questions
One bar equals approximately 14.5038 psi. Conversely, 1 psi ≈ 0.0689 bar. Bar and psi are the two most common engineering gauge-pressure units in international and US contexts respectively.
1 standard atmosphere (atm) = 101,325 Pa = 101.325 kPa = 1.01325 bar ≈ 14.696 psi = 760 mmHg = 760 Torr ≈ 29.921 inHg. It is the conventional reference for "normal" sea-level atmospheric pressure.
Absolute pressure is measured relative to a perfect vacuum. Gauge pressure is measured relative to ambient atmospheric pressure — the kind shown on tyre pressure gauges and most engineering instruments. To convert gauge to absolute, add local atmospheric pressure (~101,325 Pa or ~14.696 psi at sea level).
Also known as
TG we-Calculate Editorial Team. (2026). Pressure Unit Conversion Calculator [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/pressure-unit-conversion-calculator
TG we-Calculate Editorial Team. "Pressure Unit Conversion Calculator." TG we-Calculate. 2026. https://we-calculate.com/calculator/pressure-unit-conversion-calculator.
TG we-Calculate Editorial Team, "Pressure Unit Conversion Calculator," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/pressure-unit-conversion-calculator
@misc{wecalculate_pressure_unit_conversion_calculator, title = {Pressure Unit Conversion Calculator}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/pressure-unit-conversion-calculator}}, year = {2026}, note = {TG we-Calculate} }
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