Pascal Conversion Calculator — Pa to All Pressure Units
Convert between pascals (Pa) — the SI unit of pressure — and all common pressure units: kilopascals, megapascals, bar, millibar, atmospheres, psi, psf, Torr, mmHg, inHg, cmHg and millimetres of water. Select your input unit, enter the value, and get all conversions at once.
From unit
1 Pa = 1 N/m² — the SI unit of pressure
- 1
Pa per Pa
1 Pa = 1 Pa = 1 - 2
Pressure in pascals
101,325 × 1 = 101,325
How does this calculator work?
1 Pa = 0.001 kPa = 10⁻⁵ bar = 9.869 × 10⁻⁶ atm = 1.450 × 10⁻⁴ psi = 7.501 × 10⁻³ Torr. The pascal is the SI unit of pressure (1 N/m²). Select any source unit and enter a value to get all conversions simultaneously.
Formula
How this is calculated
The pascal (Pa) is the SI derived unit of pressure, defined as one newton per square metre (N/m²). It is the natural hub for pressure conversion: multiply the input value by its "to-Pa" factor to get pascals, then divide by the target unit's factor. All conversion factors here use the exact or best-practice values: 1 bar = 100,000 Pa (exact), 1 atm = 101,325 Pa (exact by definition since 1954), 1 psi = 6,894.757 Pa (derived from the exact pound-force and inch definitions), 1 Torr = 101,325/760 ≈ 133.322 Pa, and 1 mmH₂O (at 4 °C and standard gravity) = 9.80665 Pa.
In practice, pressure is measured on three different scales: absolute (relative to perfect vacuum), gauge (relative to ambient atmospheric pressure), and differential (between two arbitrary points). This calculator converts absolute pressures only. For gauge pressure, add one atmosphere (≈ 101,325 Pa) before converting — for example, a tyre rated at 2.2 bar gauge is 3.21 bar absolute.
Hectopascals (hPa) equal millibars exactly and are used in meteorology. Megapascals and gigapascals appear in materials science and geology. Torr and mmHg are functionally identical (differ by less than 0.000015%) and widely used in medical and vacuum contexts.
Frequently asked questions
Exactly 6,894.757 Pa. This is derived from the exact definitions: 1 pound-force = 4.4482216 N, 1 inch = 0.0254 m, so 1 psi = 4.4482216 / (0.0254²) ≈ 6,894.757 Pa.
Yes, exactly. 1 hectopascal = 100 Pa and 1 millibar = 100 Pa, so they are identical. Meteorology historically used millibar; modern practice prefers hPa (same value, SI-derived name).
Absolute pressure is measured from a perfect vacuum. Gauge pressure (as on a tyre gauge) is measured above ambient atmospheric pressure. To convert gauge to absolute, add ≈ 101,325 Pa (1 atm) at sea level. This calculator handles absolute pressure only.
Also known as
TG we-Calculate Editorial Team. (2026). Pascal Conversion Calculator — Pa to All Pressure Units [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/pascal-conversion-calculator
TG we-Calculate Editorial Team. "Pascal Conversion Calculator — Pa to All Pressure Units." TG we-Calculate. 2026. https://we-calculate.com/calculator/pascal-conversion-calculator.
TG we-Calculate Editorial Team, "Pascal Conversion Calculator — Pa to All Pressure Units," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/pascal-conversion-calculator
@misc{wecalculate_pascal_conversion_calculator, title = {Pascal Conversion Calculator — Pa to All Pressure Units}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/pascal-conversion-calculator}}, year = {2026}, note = {TG we-Calculate} }
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