Pascals to Bar Converter

Pascals to Bar

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

The Formula

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

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

Conversion Table

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

The Other Direction

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

What Each Unit Is

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

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

A Sense of Scale

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

Precision

The factor 0.00001 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 pascalToBar = (value) => value * 0.00001; ``

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 Pa with the factor truncated at each decimal place:

Decimals kept	Factor	137 Pa becomes	Error
0	0	0	100.0000%
1	0	0	100.0000%
2	0	0	100.0000%
3	0	0	100.0000%
4	0	0	100.0000%

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 pascals to three significant figures, the answer in bar is only good to three — writing more digits claims precision the measurement never had.

Other Conversions From Pascals

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

From	To	Unit
1 Pa	0.001 kPa	Kilopascals
1 Pa	9.8692e-6 atm	Atmospheres
1 Pa	1.4504e-4 psi	PSI
1 Pa	0.00750062 mmHg	mmHg

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