How many atm is 1 Pa?

0.00000986923266716 atm, which is 1 / 101,325. The pattern scales straight up: 1,000 Pa is 0.00986923266716 atm, 10,000 Pa is 0.0986923266716 atm, 50,000 Pa is 0.493461633358 atm, 100,000 Pa is 0.986923266716 atm and 101,325 Pa is exactly 1 atm. Answers are printed to twelve significant digits, so a long division is rounded for display rather than shown to the last place.

What is the formula for Pa to atm?

Atmospheres = pascals / 101,325, and pascals = atmospheres × 101,325 in the other direction. The 101,325 is a definition: the 10th General Conference on Weights and Measures fixed one standard atmosphere at exactly 101,325 Pa in 1954, so this factor is defined rather than measured. Decimal-rational arithmetic preserves the written scalar and exact divisor before the answer rounds to twelve significant digits, which is why 1 Pa prints as 0.00000986923266716. The Swap units button between the two boxes reverses the pair, so this page turns into an atm to Pa converter without a reload.

Is one bar the same as one atmosphere?

No, and the gap is about 1.31 percent. A bar is exactly 100,000 Pa, so it is 100,000 / 101,325 = 0.986923266716 atm, and one atmosphere is 1.01325 bar. Bar sits in the unit list on this page, so typing 100000 into the From box shows 1 bar and 0.986923266716 atm on the same screen, which is the quickest way to see that the two units are close but not interchangeable.

What is 1 atm in kPa and psi?

101.325 kPa and 14.6959487755 psi. Type 101325 with pascals selected and the list under the answer reads 101.325 kPa, 1.01325 bar, 14.6959487755 psi and 1 atm, because the converter works out every pressure unit at once rather than one target at a time. The psi display uses the stored thirteen-significant-digit rounded coefficient of 6,894.757293168 Pa per psi: 101,325 / 6,894.757293168 = 14.6959487755.

Is one atmosphere exactly 760 mmHg?

Exactly 760 torr, yes, because a torr is defined as one seven hundred and sixtieth of an atmosphere, or 101,325 / 760 pascals. The millimetre of mercury in this converter is the conventional mmHg of 133.322387415 Pa, which is a hair larger than a torr, so 101,325 Pa reads 759.999891726 mmHg rather than a round 760. Millimetres of mercury are hidden until you turn on the Uncommon units switch in the readout strip, labelled Show 1 more.

How do I convert megapascals to atmospheres here?

Type the value in pascals, since there is no megapascal entry in the list: 1 MPa is 1,000,000 Pa, which the converter shows as 9.86923266716 atm. The pressure category here holds pascals, kilopascals, bar, pounds per square inch and atmospheres, plus millimetres of mercury behind the uncommon units switch, so multiply megapascals by a million and enter that number.

Does it matter whether my reading is gauge or absolute?

The converter preserves the supplied pressure reference; it does not change gauge pressure into absolute pressure. To derive absolute pressure separately, add a supplied ambient pressure to the signed gauge quantity in matching units. A standard atmosphere is a defined unit, not the current ambient pressure. A supplied 200,000 Pa gauge quantity displays as 1.97384653343 atm relative to its reference. If the separately supplied ambient pressure is exactly 101,325 Pa, the absolute sum is 301,325 Pa and displays as 2.97384653343 atm. The converter does not supply that ambient value.

Why does the page open on pascals and atmospheres when I last converted something else?

This focused page opens on Pascal (Pa) to Atmosphere (atm), 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. 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.

Pa to Atm Converter

One standard atmosphere is defined as exactly 101,325 pascals, so pascals to atmospheres is a single division: atm = Pa / 101,325. That makes 101,325 Pa exactly 1 atm, 50,662.5 Pa exactly 0.5 atm, 100,000 Pa (one bar) 0.986923266716 atm and a single pascal 0.00000986923266716 atm. The 101,325 comes from a decision rather than a measurement: the 10th General Conference on Weights and Measures fixed the standard atmosphere at that many pascals in 1954, so the factor is exact and does not get revised. Displayed answers round to twelve significant digits, and a result smaller than 0.000001 is shown in exponential notation, so 0.1 Pa reads 9.86923266716e-7 atm. This page opens the converter with pascals in the From box and atmospheres in the To box, whatever pair you converted last, and lists the same pressure in kilopascals, bar, pounds per square inch and atmospheres under the answer.

From

To0.00000986923266716

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 Pa in every pressure unit

KilopascalkPa
0.001
Barbar
0.00001
Pound per square inchpsi
0.00014503773773
Atmosphereatm
0.00000986923266716

Selectable complete conversion

Unit Converter — Pressure
Input: 1 (Pascal, Pa)
Result: 0.00000986923266716 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:
Kilopascal (kPa): 0.001
Bar (bar): 0.00001
Pound per square inch (psi): 0.00014503773773
Atmosphere (atm): 0.00000986923266716
Millimeter of mercury (mmHg): 0.00750061575846

Common questions

How many atm is 1 Pa?: 0.00000986923266716 atm, which is 1 / 101,325. The pattern scales straight up: 1,000 Pa is 0.00986923266716 atm, 10,000 Pa is 0.0986923266716 atm, 50,000 Pa is 0.493461633358 atm, 100,000 Pa is 0.986923266716 atm and 101,325 Pa is exactly 1 atm. Answers are printed to twelve significant digits, so a long division is rounded for display rather than shown to the last place.
What is the formula for Pa to atm?: Atmospheres = pascals / 101,325, and pascals = atmospheres × 101,325 in the other direction. The 101,325 is a definition: the 10th General Conference on Weights and Measures fixed one standard atmosphere at exactly 101,325 Pa in 1954, so this factor is defined rather than measured. Decimal-rational arithmetic preserves the written scalar and exact divisor before the answer rounds to twelve significant digits, which is why 1 Pa prints as 0.00000986923266716. The Swap units button between the two boxes reverses the pair, so this page turns into an atm to Pa converter without a reload.
Is one bar the same as one atmosphere?: No, and the gap is about 1.31 percent. A bar is exactly 100,000 Pa, so it is 100,000 / 101,325 = 0.986923266716 atm, and one atmosphere is 1.01325 bar. Bar sits in the unit list on this page, so typing 100000 into the From box shows 1 bar and 0.986923266716 atm on the same screen, which is the quickest way to see that the two units are close but not interchangeable.
What is 1 atm in kPa and psi?: 101.325 kPa and 14.6959487755 psi. Type 101325 with pascals selected and the list under the answer reads 101.325 kPa, 1.01325 bar, 14.6959487755 psi and 1 atm, because the converter works out every pressure unit at once rather than one target at a time. The psi display uses the stored thirteen-significant-digit rounded coefficient of 6,894.757293168 Pa per psi: 101,325 / 6,894.757293168 = 14.6959487755.
Is one atmosphere exactly 760 mmHg?: Exactly 760 torr, yes, because a torr is defined as one seven hundred and sixtieth of an atmosphere, or 101,325 / 760 pascals. The millimetre of mercury in this converter is the conventional mmHg of 133.322387415 Pa, which is a hair larger than a torr, so 101,325 Pa reads 759.999891726 mmHg rather than a round 760. Millimetres of mercury are hidden until you turn on the Uncommon units switch in the readout strip, labelled Show 1 more.
How do I convert megapascals to atmospheres here?: Type the value in pascals, since there is no megapascal entry in the list: 1 MPa is 1,000,000 Pa, which the converter shows as 9.86923266716 atm. The pressure category here holds pascals, kilopascals, bar, pounds per square inch and atmospheres, plus millimetres of mercury behind the uncommon units switch, so multiply megapascals by a million and enter that number.
Does it matter whether my reading is gauge or absolute?: The converter preserves the supplied pressure reference; it does not change gauge pressure into absolute pressure. To derive absolute pressure separately, add a supplied ambient pressure to the signed gauge quantity in matching units. A standard atmosphere is a defined unit, not the current ambient pressure. A supplied 200,000 Pa gauge quantity displays as 1.97384653343 atm relative to its reference. If the separately supplied ambient pressure is exactly 101,325 Pa, the absolute sum is 301,325 Pa and displays as 2.97384653343 atm. The converter does not supply that ambient value.
Why does the page open on pascals and atmospheres when I last converted something else?: This focused page opens on Pascal (Pa) to Atmosphere (atm), 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. 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.

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.