How many micropascals are in 1 bar?

1 bar equals 100,000,000,000 micropascals, using the exact defined conversion factor rather than an estimate.

How do I convert bar to micropascal?

Multiply the bar value by 100000000000. The converter above does this instantly to whatever precision you set.

How do I convert micropascal back to bar?

Use the reverse factor: 1 micropascal equals 1e-11 bars. You can also use the swap control in the converter above to flip the direction instantly.

What is a micropascal?

Micropascal (uPa) is a unit of pressure.

Is the bar to micropascal conversion exact?

Yes. A bar is defined as exactly 100,000 pascals, close to (but distinct from) one standard atmosphere (101,325 Pa). That fixed definition is what the converter above uses, so any rounding you see is a display choice, not a limitation of the math.

Bars to Micropascals Converter

Q: What is a bar?

Bar (bar) measures pressure. A bar is defined as exactly 100,000 pascals, close to (but distinct from) one standard atmosphere (101,325 Pa). It is classified as a Non-SI metric unit accepted for use with SI.

About Converting Bars to Micropascals

Bar and Micropascal both show up on pressure gauges — psi is standard on US tire and tool specifications, while bar is the everyday pressure unit across most of the rest of the world. Bar is most often used for tire pressure specifications outside the us.

Formula

micropascals = bars × 100000000000

This factor comes from each unit's defined relationship to the category's base unit: 1 bar equals 100000 base units, and 1 micropascal equals 0.000001 base units, so dividing one by the other gives the direct bar-to-micropascal factor of 100000000000.

Simple example

1 bar × 100000000000 = 100,000,000,000 uPa

1 bar = 100,000,000,000 micropascals.

Real-world example

35 bar × 100000000000 = 3.5e+12 uPa

35 bars = 3.5e+12 micropascals.

Conversion table

Bar (bar)	Micropascal (uPa)
1 bar	100,000,000,000 uPa
5 bar	500,000,000,000 uPa
10 bar	1e+12 uPa
25 bar	2.5e+12 uPa
50 bar	5e+12 uPa
100 bar	1e+13 uPa

Reverse conversion: Micropascal to Bar

1 uPa × 1e-11 = 1e-11 bar

1 micropascal = 1e-11 bars.

bars = micropascals × 1e-11

For a page dedicated to this direction, see Micropascal to Bar.

Understanding the Bar

Bar (bar) measures pressure. A bar is defined as exactly 100,000 pascals, close to (but distinct from) one standard atmosphere (101,325 Pa). It is classified as a Non-SI metric unit accepted for use with SI.

Where it's used: Widely used in Europe and most of the world for tire pressure, weather, and industrial pressure

Uses of the Bar today

Tire pressure specifications outside the US
Meteorology (weather maps commonly use millibars, hPa)
Industrial and hydraulic pressure ratings in metric-system countries

History of the Bar

The bar was proposed by Norwegian meteorologist Vilhelm Bjerknes around 1906 as a convenient round pressure unit close to atmospheric pressure, derived from the CGS unit system (one bar equals one million dynes per square centimeter).

Though not an SI unit, the bar remains in wide practical use, particularly in meteorology (as the millibar, now more often written as the equivalent hectopascal) and in tire and hydraulic pressure specifications across most of the world.

Historical origin. Bar was not the invention of a single named person; it developed through the process described above.

Understanding the Micropascal (uPa)

Micropascal is 0.000001 pascal units.

Bar — sources

BIPM SI Brochure — Non-SI units accepted for use with SI — Lists the bar among accepted non-SI pressure units.

Bars to Micropascals Converter — bar to uPa

Pressure Converter