Bar to Pascals Converter

Bar to Pascals

Convert bar (bar) to pascals (Pa). Both measure force per area, and the conversion comes up in weather, automotive, diving work.

The Formula

`` pascals = bar × 100000 bar = pascals × 0.00001 `

One bar is 100,000 pascals, and one pascal is 1.0000e-5 bar.

Conversion Table

Bar	Pascals
1 bar	100,000 Pa
2 bar	200,000 Pa
5 bar	500,000 Pa
10 bar	1,000,000 Pa
25 bar	2,500,000 Pa
50 bar	5,000,000 Pa
100 bar	10,000,000 Pa
500 bar	50,000,000 Pa
1,000 bar	100,000,000 Pa

The Other Direction

Pascals	Bar
1 Pa	1.0000e-5 bar
2 Pa	2.0000e-5 bar
5 Pa	5.0000e-5 bar
10 Pa	1.0000e-4 bar
25 Pa	2.5000e-4 bar
50 Pa	5.0000e-4 bar
100 Pa	0.001 bar
500 Pa	0.005 bar
1,000 Pa	0.01 bar

What Each Unit Is

Bar (bar) — exactly 100,000 pascals — close to, but not exactly, one atmosphere. Introduced by meteorologist Vilhelm Bjerknes; weather maps use millibars.

Pascals (Pa) — one newton per square metre — the SI derived unit of pressure. Named for Blaise Pascal, who established that pressure varies with altitude.

A Sense of Scale

• Sea-level pressure is about 1.013 bar
• Diving adds 1 bar per 10 m of depth
• Atmospheric pressure is 101,325 Pa
• A pascal is a very small unit

Precision

The factor 100000 is exact by international agreement, not a rounded approximation. Any imprecision in a result comes from your input, not the conversion.

In Code

`javascript const barToPascal = (value) => value * 100000; ``

Where This Conversion Comes Up

• Weather
• Automotive
• Diving
• Aviation
• HVAC

How Many Decimals Do You Need?

Rounding the factor costs accuracy, and how much depends on the factor. Converting 137 bar with the factor truncated at each decimal place:

Decimals kept	Factor	137 bar becomes	Error
0	100000	13,700,000	—
1	100000	13,700,000	—
2	100000	13,700,000	—
3	100000	13,700,000	—
4	100000	13,700,000	—

A rule that holds for any conversion: round once, at the end. Rounding the factor and then multiplying compounds the error through every subsequent calculation, while carrying full precision and rounding the final answer does not.

The right number of significant figures is set by your input, not by the converter. If you measured bar to three significant figures, the answer in pascals is only good to three — writing more digits claims precision the measurement never had.

Other Conversions From Bar

The same value in every other unit this converter supports for pressure:

From	To	Unit
1 bar	100 kPa	Kilopascals
1 bar	0.986923 atm	Atmospheres
1 bar	14.5038 psi	PSI
1 bar	750.062 mmHg	mmHg

Chaining conversions works — bar to metres to feet gives the same answer as bar to feet — but each step rounds, so a chain of three conversions carries three roundings. Convert directly where a direct factor exists.