Pascals (Pa)
0
Equivalent pressure
Accurate pressure conversion between bar, pascals, kilopascals, megapascals, atmospheres, and PSI
Convert bar to pascals instantly with precise calculations. Includes bidirectional conversion and a complete multi-unit pressure breakdown for engineering, HVAC, meteorology, and science in 2026.
Professional pressure conversion for engineering, meteorology, HVAC, hydraulics, and scientific research
Convert bar to pascals using the exact definition: 1 bar = 100,000 pascals. This is a fixed, exact relationship — the bar was specifically designed as a rounded metric unit close to atmospheric pressure. Every result from this converter is derived from this exact definition for consistent, reliable outputs in any engineering or scientific context in 2026.
Switch seamlessly between bar to pascals and pascals to bar conversion modes. Get instant results alongside equivalent values in kilopascals, megapascals, atmospheres, and PSI — giving you a complete pressure picture from a single input value for any mechanical, fluid, or atmospheric calculation in 2026.
Essential for mechanical and chemical engineers, HVAC technicians, tyre pressure specialists, meteorologists reading weather maps, scuba divers calculating tank pressure, and students studying fluid mechanics. The bar and pascal are both used on pressure gauges, weather instruments, and engineering datasheets worldwide in 2026.
Select conversion direction and enter your value below
The bar is a metric unit of pressure equal to exactly 100,000 pascals (100 kPa). It was introduced in 1909 and is widely used in engineering, meteorology, and industrial applications because its value is conveniently close to atmospheric pressure (standard atmosphere = 101,325 Pa ≈ 1.01325 bar). The pascal (Pa) is the SI derived unit of pressure, defined as one newton per square metre (N/m²). Because of the clean factor of 100,000, converting between bar and pascals requires only a straightforward multiplication or division.
Bar values are found on pressure gauges for tyres, boilers, gas cylinders, hydraulic systems, and weather instruments. Pascals and kilopascals are preferred in scientific and SI-standard engineering contexts. Understanding the conversion is therefore essential for engineers, technicians, and students who regularly move between product datasheets (often in bar) and technical standards (often in Pa or kPa). One millibar (mbar), commonly used in meteorology, equals 100 Pa or 0.001 bar.
The bar-to-pascal relationship (1 bar = 100,000 Pa) is exact. The bar-to-atm factor (1 bar ≈ 0.986923 atm) and bar-to-PSI factor (1 bar ≈ 14.5038 PSI) are not exact but are correct to 6 significant figures for all practical engineering and scientific use in 2026.
2.5 bar × 100,000 = 250,000 Pa = 250 kPa
2.5 bar equals 250,000 pascals or 250 kilopascals. This pressure is typical of a car tyre inflation target and equals approximately 36.26 PSI or 2.467 standard atmospheres. In megapascals, 2.5 bar = 0.25 MPa.
1 bar = 100,000 Pa exactly. Standard atmospheric pressure is 1.01325 bar = 101,325 Pa. Tyre pressures are typically 2–3 bar. Industrial gas cylinders can reach 200–300 bar.
This reference table covers the most commonly needed bar-to-pascals conversions for engineering, meteorology, HVAC, and everyday applications. The key reference of 1 bar = 100,000 Pa is highlighted as the primary conversion anchor.
| Bar | Pascals (Pa) | Kilopascals (kPa) | PSI | Common Reference |
|---|---|---|---|---|
| 0.001 bar | 100 Pa | 0.1 kPa | 0.0145 PSI | 1 millibar (weather maps) |
| 0.01 bar | 1,000 Pa | 1 kPa | 0.145 PSI | 10 millibar |
| 0.1 bar | 10,000 Pa | 10 kPa | 1.450 PSI | 100 millibar |
| 0.5 bar | 50,000 Pa | 50 kPa | 7.252 PSI | Half bar — low pressure |
| 1 bar ★ | 100,000 Pa | 100 kPa | 14.504 PSI | Key reference ≈ 1 atmosphere |
| 1.01325 bar | 101,325 Pa | 101.325 kPa | 14.696 PSI | 1 standard atmosphere (atm) |
| 2 bar | 200,000 Pa | 200 kPa | 29.008 PSI | Bicycle tyre (road) |
| 2.5 bar | 250,000 Pa | 250 kPa | 36.260 PSI | Car tyre (typical) |
| 3 bar | 300,000 Pa | 300 kPa | 43.511 PSI | Car tyre (high pressure) |
| 10 bar | 1,000,000 Pa | 1,000 kPa | 145.038 PSI | Water at 100 m depth |
| 100 bar | 10,000,000 Pa | 10,000 kPa | 1,450.38 PSI | Industrial hydraulics |
| 200 bar | 20,000,000 Pa | 20,000 kPa | 2,900.75 PSI | Scuba cylinder (full) |
| 1,000 bar | 100,000,000 Pa | 100,000 kPa | 14,503.8 PSI | Ultra-high pressure systems |
The pascal (Pa) is the SI unit of pressure and stress, defined as one newton per square metre (N/m²). It is named after the French mathematician and physicist Blaise Pascal (1623–1662), who made significant contributions to the study of fluid pressure. The pascal is used in all scientific contexts and is the standard unit for pressure in the International System of Units (SI) in 2026.
The bar was defined in 1909 as exactly 10⁵ Pa. Although not an SI unit, it is accepted for use with the SI system by the International Bureau of Weights and Measures (BIPM). It is widely used in industry because pressure gauges, gas cylinder valves, and tyre inflation tools are calibrated in bar or millibar across Europe, Asia, and most of the world in 2026.
Weather forecasts and synoptic charts use the millibar (mbar or mb), where 1 mbar = 100 Pa = 0.001 bar. Standard atmospheric pressure at sea level is 1013.25 mbar = 101,325 Pa = 1.01325 bar. Meteorologists read pressure systems in mbar — low pressure below ~1000 mbar (storms) and high pressure above ~1020 mbar (fair weather) — making this a critical everyday conversion in 2026.
While bar is the standard pressure unit in metric countries, PSI (pounds per square inch) remains common in the United States and the UK for tyre pressures and some gas system ratings. 1 bar ≈ 14.5038 PSI. A car tyre at 2.5 bar = 36.3 PSI. A road bicycle tyre at 7 bar ≈ 101.5 PSI. Converting between bar and PSI is essential for anyone servicing vehicles or using American-specification equipment in 2026.
Any bar → Pa: Multiply by 100,000 | e.g., 3 bar × 100,000 = 300,000 Pa
Any bar → kPa: Multiply by 100 | e.g., 2.5 bar × 100 = 250 kPa
Any Pa → bar: Divide by 100,000 | e.g., 101,325 Pa ÷ 100,000 = 1.01325 bar
Pressure readings are either absolute (measured from zero — perfect vacuum) or gauge (measured relative to atmospheric pressure). A car tyre labelled 2.5 bar is gauge pressure — the actual absolute pressure inside is about 2.5 + 1.013 = 3.513 bar. Always check whether a specification uses absolute (bara) or gauge (barg) pressure before making engineering calculations in 2026, as confusing the two can lead to serious errors in system design and safety assessments.
Learn how pascals, kilopascals, bar, millibar, atmospheres, PSI, and torr relate to each other. Essential for engineers, scientists, meteorologists, and students working with fluid systems, weather data, and pressure-sensitive equipment in 2026.
Pressure Converters →Browse our complete library of free unit converters covering length, area, mass, volume, pressure, energy, speed, and time — all precise, mobile friendly, and designed for students, professionals, and everyday users throughout 2026.
Energy Converters →Access guides and converters for mechanical engineering, chemical engineering, HVAC system design, and scientific research — all grounded in SI standards and internationally recognised definitions for accurate technical results in 2026.
Area Converters →