How many kPa are in 1 bar?

Exactly 100 kPa. The bar is defined as 100,000 pascals and a kilopascal is 1,000 pascals, so one divides into the other cleanly and the conversion is a multiplication by 100 with nothing left over. From there: 0.5 bar is 50 kPa, 0.9 bar is 90 kPa, 1.5 bar is 150 kPa, 2.2 bar is 220 kPa, 3.5 bar is 350 kPa, 10 bar is 1,000 kPa and 200 bar is 20,000 kPa. The headline prints the larger figures with thousands separators, and Copy result puts the plain number on the clipboard, so 200 bar copies as 20000 rather than 20,000.

What is the formula, and how do I go from kPa back to bar?

Kilopascals = bar × 100, and bar = kilopascals / 100 in the other direction, which is the same decimal point moved two places the other way: 1 kPa is 0.01 bar, 100 kPa is 1 bar, 220 kPa is 2.2 bar and 350 kPa is 3.5 bar. You do not have to retype anything to reverse it. The Swap units button sits between the two boxes and puts kPa in the From box and bar in the To box, which turns this page into a kPa to bar converter without a reload.

Is the bar to kilopascal conversion exact, or is it rounded?

The factor is exact: 1 bar is defined as 100,000 Pa and 1 kPa as 1,000 Pa, so kPa = bar × 100. The display rounds to twelve significant digits, so a sufficiently long input is not printed in full. The examples 1.01325 bar = 101.325 kPa and 2.2 bar = 220 kPa are exact. Other rows can be rounded; the psi row uses the stated rounded coefficient of 6,894.757293168 Pa per psi.

My tyre placard says 240 kPa. What is that in bar and psi?

2.4 bar, and 34.8090570553 psi. Car placards often print two or three of these side by side because pumps are labelled differently by country, and they are the same pressure: 200 kPa is 2 bar, 220 kPa is 2.2 bar and 31.9083023006 psi, 240 kPa is 2.4 bar and 34.8090570553 psi. Put the kPa figure in the From box after pressing Swap units, or type the bar figure directly and read the kPa and psi answers off the list below the headline.

What else does it show me besides kilopascals?

The other common units in the pressure category together, worked out from the value you typed rather than one target at a time. For 1 bar the list reads 100,000 Pa, 100 kPa, 14.503773773 psi and 0.986923266716 atm, and for 200 bar it reads 20,000,000 Pa, 20,000 kPa, 2,900.7547546 psi and 197.384653343 atm. Millimetres of mercury stay out of the way until you tick the uncommon units switch in the readout strip, labelled Show 1 more, where 1 bar reads 750.061575846 mmHg.

How do I convert millibars, hectopascals or megapascals here?

By moving the decimal point, since none of the three is a separate entry in this list. A millibar and a hectopascal are the same size, one tenth of a kilopascal, so kPa × 10 gives hPa and bar × 1,000 gives mbar: a sea level reading of 1,013.25 mbar is 1.01325 bar, which this page converts to 101.325 kPa, and that is 1,013.25 hPa again. A megapascal is 1,000 kPa, so divide the answer by a thousand: 10 bar is 1,000 kPa or 1 MPa, and 200 bar is 20,000 kPa or 20 MPa.

Is one bar the same as one atmosphere?

No, it is about 1.3 percent below it. A standard atmosphere is defined as exactly 101,325 pascals, which is 101.325 kPa, so 1 bar is 0.986923266716 atm and 1 atm is 1.01325 bar. Type 1.01325 with bar selected and the answer reads 101.325 kPa with exactly 1 atm in the list under it. Close enough to trade the words in conversation, far enough apart to matter on a gauge you have calibrated.

Does it know whether my figure is gauge or absolute pressure?

It changes units while preserving the gauge or absolute reference, and does not add ambient pressure. A gauge reading of 2.2 bar is 220 kPa above ambient. If ambient pressure is assumed to be exactly one standard atmosphere (1.01325 bar), the corresponding absolute pressure is 3.21325 bar or 321.325 kPa. Negative gauge values also convert arithmetically: -0.5 bar gauge is -50 kPa gauge.

Why does the page open on bar and kPa when I last converted something else?

A focused page opens on its named pair, so this one selects bar and kilopascals while preserving the main converter’s saved pair. When storage is usable, the last saved valid value and uncommon-unit preference can travel between pages. Type 2.2 or a matching suffix such as 2.2 bar; both display 220 kPa. Grouped thousands such as 1,013.25 are accepted, while a decimal comma such as 1,5 is refused. Invalid or incomplete drafts stay on screen without replacing saved settings. If saved settings are unusable or conflict, the page explains this and offers Forget saved settings.

Bar to kPa Converter

One bar is exactly 100 kilopascals, so this conversion is a multiplication by 100, which on paper is the decimal point moved two places to the right: 1 bar is 100 kPa, 1.5 bar is 150 kPa, 2.2 bar is 220 kPa, 8 bar is 800 kPa and a 200 bar cylinder is 20,000 kPa. Both units are fixed against the pascal by definition, the bar at 100,000 Pa and the kilopascal at 1,000 Pa, so their scaling factor is exactly 100. The displayed result still rounds to twelve significant digits when the input has more digits. The pair comes up most often on a tyre placard, where the same pressure is printed as 2.4 bar in one column and 240 kPa in another, and in weather reports, where a kilopascal is ten hectopascals. Type into the From box and the answer updates as you go, shown to twelve significant digits with thousands separators, while the list underneath gives the same pressure in pascals, pounds per square inch and atmospheres at once. This page opens the converter on bar and kilopascals ahead of whatever pair you last used, and it converts units only: whether your reading is gauge or absolute is something the number alone cannot say.

From

To100

Category: Pressure

Base unit: pascal

Uncommon units: Show 1 more

One standard atmosphere is 101,325 Pa. mmHg is the conventional 133.322387415 Pa, distinct from the torr (exactly 101,325/760 Pa). The psi coefficient is rounded to 6,894.757293168 Pa. Converting units preserves gauge or absolute reference; it does not add ambient pressure.

Results round to 12 significant digits using the listed unit definitions. Input must have a finite numeric magnitude and at most 512 significant digits. Type a single decimal or scientific number; a matching From unit suffix is accepted. Commas and grouped spaces separate thousands; decimal commas, fractions and compound measurements are refused.

1 bar in every pressure unit

PascalPa
100,000
KilopascalkPa
100
Pound per square inchpsi
14.503773773
Atmosphereatm
0.986923266716

Selectable complete conversion

Unit Converter — Pressure
Input: 1 (Bar, bar)
Result: 100 kPa (Kilopascal)
Displayed values round to 12 significant digits.
One standard atmosphere is 101,325 Pa. mmHg is the conventional 133.322387415 Pa, distinct from the torr (exactly 101,325/760 Pa). The psi coefficient is rounded to 6,894.757293168 Pa. Converting units preserves gauge or absolute reference; it does not add ambient pressure.
All other units:
Pascal (Pa): 100000
Kilopascal (kPa): 100
Pound per square inch (psi): 14.503773773
Atmosphere (atm): 0.986923266716
Millimeter of mercury (mmHg): 750.061575846

Common questions

How many kPa are in 1 bar?: Exactly 100 kPa. The bar is defined as 100,000 pascals and a kilopascal is 1,000 pascals, so one divides into the other cleanly and the conversion is a multiplication by 100 with nothing left over. From there: 0.5 bar is 50 kPa, 0.9 bar is 90 kPa, 1.5 bar is 150 kPa, 2.2 bar is 220 kPa, 3.5 bar is 350 kPa, 10 bar is 1,000 kPa and 200 bar is 20,000 kPa. The headline prints the larger figures with thousands separators, and Copy result puts the plain number on the clipboard, so 200 bar copies as 20000 rather than 20,000.
What is the formula, and how do I go from kPa back to bar?: Kilopascals = bar × 100, and bar = kilopascals / 100 in the other direction, which is the same decimal point moved two places the other way: 1 kPa is 0.01 bar, 100 kPa is 1 bar, 220 kPa is 2.2 bar and 350 kPa is 3.5 bar. You do not have to retype anything to reverse it. The Swap units button sits between the two boxes and puts kPa in the From box and bar in the To box, which turns this page into a kPa to bar converter without a reload.
Is the bar to kilopascal conversion exact, or is it rounded?: The factor is exact: 1 bar is defined as 100,000 Pa and 1 kPa as 1,000 Pa, so kPa = bar × 100. The display rounds to twelve significant digits, so a sufficiently long input is not printed in full. The examples 1.01325 bar = 101.325 kPa and 2.2 bar = 220 kPa are exact. Other rows can be rounded; the psi row uses the stated rounded coefficient of 6,894.757293168 Pa per psi.
My tyre placard says 240 kPa. What is that in bar and psi?: 2.4 bar, and 34.8090570553 psi. Car placards often print two or three of these side by side because pumps are labelled differently by country, and they are the same pressure: 200 kPa is 2 bar, 220 kPa is 2.2 bar and 31.9083023006 psi, 240 kPa is 2.4 bar and 34.8090570553 psi. Put the kPa figure in the From box after pressing Swap units, or type the bar figure directly and read the kPa and psi answers off the list below the headline.
What else does it show me besides kilopascals?: The other common units in the pressure category together, worked out from the value you typed rather than one target at a time. For 1 bar the list reads 100,000 Pa, 100 kPa, 14.503773773 psi and 0.986923266716 atm, and for 200 bar it reads 20,000,000 Pa, 20,000 kPa, 2,900.7547546 psi and 197.384653343 atm. Millimetres of mercury stay out of the way until you tick the uncommon units switch in the readout strip, labelled Show 1 more, where 1 bar reads 750.061575846 mmHg.
How do I convert millibars, hectopascals or megapascals here?: By moving the decimal point, since none of the three is a separate entry in this list. A millibar and a hectopascal are the same size, one tenth of a kilopascal, so kPa × 10 gives hPa and bar × 1,000 gives mbar: a sea level reading of 1,013.25 mbar is 1.01325 bar, which this page converts to 101.325 kPa, and that is 1,013.25 hPa again. A megapascal is 1,000 kPa, so divide the answer by a thousand: 10 bar is 1,000 kPa or 1 MPa, and 200 bar is 20,000 kPa or 20 MPa.
Is one bar the same as one atmosphere?: No, it is about 1.3 percent below it. A standard atmosphere is defined as exactly 101,325 pascals, which is 101.325 kPa, so 1 bar is 0.986923266716 atm and 1 atm is 1.01325 bar. Type 1.01325 with bar selected and the answer reads 101.325 kPa with exactly 1 atm in the list under it. Close enough to trade the words in conversation, far enough apart to matter on a gauge you have calibrated.
Does it know whether my figure is gauge or absolute pressure?: It changes units while preserving the gauge or absolute reference, and does not add ambient pressure. A gauge reading of 2.2 bar is 220 kPa above ambient. If ambient pressure is assumed to be exactly one standard atmosphere (1.01325 bar), the corresponding absolute pressure is 3.21325 bar or 321.325 kPa. Negative gauge values also convert arithmetically: -0.5 bar gauge is -50 kPa gauge.
Why does the page open on bar and kPa when I last converted something else?: A focused page opens on its named pair, so this one selects bar and kilopascals while preserving the main converter’s saved pair. When storage is usable, the last saved valid value and uncommon-unit preference can travel between pages. Type 2.2 or a matching suffix such as 2.2 bar; both display 220 kPa. Grouped thousands such as 1,013.25 are accepted, while a decimal comma such as 1,5 is refused. Invalid or incomplete drafts stay on screen without replacing saved settings. If saved settings are unusable or conflict, the page explains this and offers Forget saved settings.

Results round to 12 significant digits using the listed unit conventions. Many factors are exact definitions; psi and parsec use rounded coefficients. Temperature includes scale offsets. Days and weeks are fixed-duration units, and unit conversion does not determine calendar dates, ambient pressure or a software label’s convention.