How many atm is 1 kPa?

0.00986923266716 atm, which is 1,000 / 101,325. It scales straight up: 10 kPa is 0.0986923266716 atm, 50 kPa is 0.493461633358 atm, 100 kPa is 0.986923266716 atm, 200 kPa is 1.97384653343 atm and 1,000 kPa is 9.86923266716 atm. Answers print to twelve significant digits, so the repeating decimal behind the division is rounded for display rather than run out to the last place.

What is the formula for kPa to atm?

Atmospheres = kilopascals / 101.325, and kilopascals = atmospheres × 101.325 in the other direction, so 0.5 atm is 50.6625 kPa, 2 atm is 202.65 kPa and 3 atm is 303.975 kPa. The 101.325 is a definition rather than a measurement: the 10th General Conference on Weights and Measures fixed one standard atmosphere at exactly 101,325 Pa in 1954, so the factor is exact and is not revised. The Swap units button between the two boxes reverses the pair, which turns this page into an atm to kPa converter without a reload.

Is 100 kPa one atmosphere?

No, 100 kPa is exactly one bar, and that is a different unit. A bar is defined as 100,000 pascals and an atmosphere as 101,325 pascals, so 100 kPa comes out as 0.986923266716 atm, about 1.3 percent short, and one atmosphere is 101.325 kPa or 1.01325 bar. The converter shows both units for the same supplied quantity: type 100 in the From box and the list under the answer reads 1 bar and 0.986923266716 atm on the same screen.

How do I convert MPa, hPa or millibars here?

MPa, hPa and mbar are absent from the menu and their matching suffixes are not accepted with Kilopascal selected. Convert the supplied scalar to kPa separately: 1 MPa = 1,000 kPa and 1 hPa = 1 mbar = 0.1 kPa. Thus a stated 1 MPa converts via 1,000 kPa to 9.86923266716 atm, and 1,013.25 hPa via 101.325 kPa to exactly 1 atm. These arithmetic examples do not establish current ambient or sea-level pressure.

What else does it show for the same pressure?

The other common pressure units appear together, with mmHg available through Show 1 more. For 100 kPa the list reads 100,000 Pa, 1 bar, 14.503773773 psi and 0.986923266716 atm, and switching on Uncommon units in the readout strip, labelled Show 1 more, adds 750.061575846 mmHg. The mmHg row uses the conventional factor 133.322387415 Pa; it is distinct from torr. Copy result copies the displayed headline without digit-grouping commas; each visible conversion row has its own Copy button. Displayed and copied values round to twelve significant digits. If native copying fails, a complete selectable summary identifies the input, selected pair and conventions and includes every unit in the category, including uncommon units.

Does it matter whether my figure is gauge or absolute?

Yes: the reference is part of the quantity’s meaning, and conversion preserves it. A stated 220 kPa absolute displays as 2.17123118678 atm absolute; 220 kPa gauge displays as the same numeric count in atm gauge. To derive absolute pressure separately, supply the ambient pressure and add it first. With an explicitly assumed ambient 101.325 kPa, 220 kPa gauge becomes 321.325 kPa absolute, displaying as 3.17123118678 atm absolute. Ambient pressure is not inferred from an open-air gauge and need not equal one standard atmosphere. The converter has no gauge-to-absolute mode.

Why does a small pressure use exponential notation?

A supplied 0.0001 kPa displays as 9.86923266716e-7 atm, while 0.001 kPa displays as 0.00000986923266716 atm. Both formats round to twelve significant digits. Displayed magnitudes below 0.000001 or at or above 1e15 use exponential form; the rest use decimal form, with grouping for readability. Thus 100,000 kPa reads 986.923266716 atm. Properly grouped 1,234.5, exponents and matching suffixes are accepted; malformed grouping, fractions and compound quantities are refused with an explanation.

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

This focused page opens on Kilopascal and Atmosphere, while preserving the main converter’s saved unit pair. When storage is usable, a saved value and uncommon-unit preference can travel between pages. Its suffix must still match From. Valid deliberate scalar edits can save those fields after a short delay; invalid or incomplete drafts preserve the saved record. Unusable or conflicting records remain until you use Forget saved settings, which keeps the current conversion on screen. Your input and converted values are calculated in the browser and are not uploaded by the converter. The definitions arrive with the page, so conversion needs no external data lookup and keeps working offline after the page has loaded. The core conversion needs no account.

kPa to Atm Converter

One standard atmosphere is defined as exactly 101,325 pascals, which is exactly 101.325 kilopascals, so kilopascals to atmospheres is a single division: atm = kPa / 101.325. That makes 1 kPa 0.00986923266716 atm, 10 kPa 0.0986923266716 atm, 100 kPa 0.986923266716 atm, 101.325 kPa exactly 1 atm and 1,000 kPa 9.86923266716 atm. The figure worth a second look is 100 kPa, because it is exactly one bar and not one atmosphere: it falls about 1.3 percent short, which is the whole reason these two units get mixed up. This page opens the converter with kilopascals in the From box and atmospheres in the To box, ahead of whatever pair you converted last, and the list under the answer carries the same pressure in pascals, bar and pounds per square inch, with millimetres of mercury behind the uncommon units switch. mmHg uses the conventional 133.322387415 Pa, distinct from the exact torr of 101,325/760 Pa; the psi coefficient is rounded to 6,894.757293168 Pa. It changes the units on a number and nothing else: a converted figure is still just a quantity, and what a given pressure means in a given setting is not something arithmetic can tell you.

From

To0.00986923266716

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 kPa in every pressure unit

PascalPa
1,000
Barbar
0.01
Pound per square inchpsi
0.14503773773
Atmosphereatm
0.00986923266716

Selectable complete conversion

Unit Converter — Pressure
Input: 1 (Kilopascal, kPa)
Result: 0.00986923266716 atm (Atmosphere)
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): 1000
Bar (bar): 0.01
Pound per square inch (psi): 0.14503773773
Atmosphere (atm): 0.00986923266716
Millimeter of mercury (mmHg): 7.50061575846

Common questions

How many atm is 1 kPa?: 0.00986923266716 atm, which is 1,000 / 101,325. It scales straight up: 10 kPa is 0.0986923266716 atm, 50 kPa is 0.493461633358 atm, 100 kPa is 0.986923266716 atm, 200 kPa is 1.97384653343 atm and 1,000 kPa is 9.86923266716 atm. Answers print to twelve significant digits, so the repeating decimal behind the division is rounded for display rather than run out to the last place.
What is the formula for kPa to atm?: Atmospheres = kilopascals / 101.325, and kilopascals = atmospheres × 101.325 in the other direction, so 0.5 atm is 50.6625 kPa, 2 atm is 202.65 kPa and 3 atm is 303.975 kPa. The 101.325 is a definition rather than a measurement: the 10th General Conference on Weights and Measures fixed one standard atmosphere at exactly 101,325 Pa in 1954, so the factor is exact and is not revised. The Swap units button between the two boxes reverses the pair, which turns this page into an atm to kPa converter without a reload.
Is 100 kPa one atmosphere?: No, 100 kPa is exactly one bar, and that is a different unit. A bar is defined as 100,000 pascals and an atmosphere as 101,325 pascals, so 100 kPa comes out as 0.986923266716 atm, about 1.3 percent short, and one atmosphere is 101.325 kPa or 1.01325 bar. The converter shows both units for the same supplied quantity: type 100 in the From box and the list under the answer reads 1 bar and 0.986923266716 atm on the same screen.
How do I convert MPa, hPa or millibars here?: MPa, hPa and mbar are absent from the menu and their matching suffixes are not accepted with Kilopascal selected. Convert the supplied scalar to kPa separately: 1 MPa = 1,000 kPa and 1 hPa = 1 mbar = 0.1 kPa. Thus a stated 1 MPa converts via 1,000 kPa to 9.86923266716 atm, and 1,013.25 hPa via 101.325 kPa to exactly 1 atm. These arithmetic examples do not establish current ambient or sea-level pressure.
What else does it show for the same pressure?: The other common pressure units appear together, with mmHg available through Show 1 more. For 100 kPa the list reads 100,000 Pa, 1 bar, 14.503773773 psi and 0.986923266716 atm, and switching on Uncommon units in the readout strip, labelled Show 1 more, adds 750.061575846 mmHg. The mmHg row uses the conventional factor 133.322387415 Pa; it is distinct from torr. Copy result copies the displayed headline without digit-grouping commas; each visible conversion row has its own Copy button. Displayed and copied values round to twelve significant digits. If native copying fails, a complete selectable summary identifies the input, selected pair and conventions and includes every unit in the category, including uncommon units.
Does it matter whether my figure is gauge or absolute?: Yes: the reference is part of the quantity’s meaning, and conversion preserves it. A stated 220 kPa absolute displays as 2.17123118678 atm absolute; 220 kPa gauge displays as the same numeric count in atm gauge. To derive absolute pressure separately, supply the ambient pressure and add it first. With an explicitly assumed ambient 101.325 kPa, 220 kPa gauge becomes 321.325 kPa absolute, displaying as 3.17123118678 atm absolute. Ambient pressure is not inferred from an open-air gauge and need not equal one standard atmosphere. The converter has no gauge-to-absolute mode.
Why does a small pressure use exponential notation?: A supplied 0.0001 kPa displays as 9.86923266716e-7 atm, while 0.001 kPa displays as 0.00000986923266716 atm. Both formats round to twelve significant digits. Displayed magnitudes below 0.000001 or at or above 1e15 use exponential form; the rest use decimal form, with grouping for readability. Thus 100,000 kPa reads 986.923266716 atm. Properly grouped 1,234.5, exponents and matching suffixes are accepted; malformed grouping, fractions and compound quantities are refused with an explanation.
Why does the page open on kPa and atm when I last converted something else?: This focused page opens on Kilopascal and Atmosphere, while preserving the main converter’s saved unit pair. When storage is usable, a saved value and uncommon-unit preference can travel between pages. Its suffix must still match From. Valid deliberate scalar edits can save those fields after a short delay; invalid or incomplete drafts preserve the saved record. Unusable or conflicting records remain until you use Forget saved settings, which keeps the current conversion on screen. Your input and converted values are calculated in the browser and are not uploaded by the converter. The definitions arrive with the page, so conversion needs no external data lookup and keeps working offline after the page has loaded. The core conversion needs no account.

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.