Bar to Kilopascals Converter

Bar to Kilopascals

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

The Formula

`` kilopascals = bar × 100 bar = kilopascals × 0.01 `

One bar is 100 kilopascals, and one kilopascal is 0.01 bar.

Conversion Table

Bar	Kilopascals
1 bar	100 kPa
2 bar	200 kPa
5 bar	500 kPa
10 bar	1,000 kPa
25 bar	2,500 kPa
50 bar	5,000 kPa
100 bar	10,000 kPa
500 bar	50,000 kPa
1,000 bar	100,000 kPa

The Other Direction

Kilopascals	Bar
1 kPa	0.01 bar
2 kPa	0.02 bar
5 kPa	0.05 bar
10 kPa	0.1 bar
25 kPa	0.25 bar
50 kPa	0.5 bar
100 kPa	1 bar
500 kPa	5 bar
1,000 kPa	10 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.

Kilopascals (kPa) — 1,000 pascals. The practical metric working unit for tyre and industrial pressures.

A Sense of Scale

• Sea-level pressure is about 1.013 bar
• Diving adds 1 bar per 10 m of depth
• Car tyres run at 220–250 kPa
• Atmospheric pressure is 101.3 kPa

Precision

The factor 100 is rounded. For engineering work carry more digits than the table above, and round only at the end — rounding at each step compounds.

In Code

`javascript const barToKilopascal = (value) => value * 100; ``

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	100	13,700	—
1	100	13,700	—
2	100	13,700	—
3	100	13,700	—
4	100	13,700	—

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 kilopascals 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	100,000 Pa	Pascals
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.