Convert Pascal to Standard atmosphere
1 pascal = 0.000009869233 standard atmosphere (atm). For example, 10 pascal = 0.00009869233 standard atmosphere and 100 pascal = 0.0009869233 standard atmosphere. Type any value below to convert pascal to standard atmosphere both ways — it runs entirely in your browser.
Quick answer: Pascal to Standard atmosphere
1 Pascal = 0.000009869233 Standard atmosphere (Pa → atm). To convert pascal to standard atmosphere, multiply by 0.000009869233. To convert standard atmosphere to pascal, multiply by 101,325. The converter at the top does this instantly and both ways; the sections below give the formula, worked examples, a full conversion chart and answers to the most common pascal-to-standard atmosphere questions.
How to convert Pascal to Standard atmosphere
To convert pascal to standard atmosphere, multiply the number of pascal by the conversion factor 0.000009869233, because 1 Pa = 0.000009869233 atm. The conversion is linear, so the same factor works for any value — whole numbers, decimals or fractions. For the reverse direction, 1 atm = 101,325 Pa, so you divide by 0.000009869233 (or multiply by 101,325) to turn standard atmosphere back into pascal.
atm = Pa × 0.000009869233 ·
Pa = atm × 101,325
- Write down the value you want to convert, in pascal.
- Multiply it by 0.000009869233.
- The result is the same area/length/quantity expressed in standard atmosphere.
Pascal to Standard atmosphere — worked examples
Each row shows the exact arithmetic so you can follow the conversion step by step. For example, 5 pascal is 0.00004934616 standard atmosphere because 5 Pa × 0.000009869233 = 0.00004934616 atm.
| Pascal | Calculation | Standard atmosphere |
|---|---|---|
| 1 Pa | 1 Pa × 0.000009869233 = 0.000009869233 atm | 0.000009869233 atm |
| 2 Pa | 2 Pa × 0.000009869233 = 0.00001973847 atm | 0.00001973847 atm |
| 3 Pa | 3 Pa × 0.000009869233 = 0.0000296077 atm | 0.0000296077 atm |
| 5 Pa | 5 Pa × 0.000009869233 = 0.00004934616 atm | 0.00004934616 atm |
| 7 Pa | 7 Pa × 0.000009869233 = 0.00006908463 atm | 0.00006908463 atm |
| 10 Pa | 10 Pa × 0.000009869233 = 0.00009869233 atm | 0.00009869233 atm |
| 12 Pa | 12 Pa × 0.000009869233 = 0.0001184308 atm | 0.0001184308 atm |
| 15 Pa | 15 Pa × 0.000009869233 = 0.0001480385 atm | 0.0001480385 atm |
| 20 Pa | 20 Pa × 0.000009869233 = 0.0001973847 atm | 0.0001973847 atm |
| 25 Pa | 25 Pa × 0.000009869233 = 0.0002467308 atm | 0.0002467308 atm |
| 50 Pa | 50 Pa × 0.000009869233 = 0.0004934616 atm | 0.0004934616 atm |
| 100 Pa | 100 Pa × 0.000009869233 = 0.0009869233 atm | 0.0009869233 atm |
Common Pascal to Standard atmosphere conversions
These are the pascal-to-standard atmosphere values people look up most often. Every figure is computed from the exact factor, so you can rely on them for quick reference:
- 1 pascal = 0.000009869233 standard atmosphere
- 2 pascal = 0.00001973847 standard atmosphere
- 2.5 pascal = 0.00002467308 standard atmosphere
- 3 pascal = 0.0000296077 standard atmosphere
- 4 pascal = 0.00003947693 standard atmosphere
- 5 pascal = 0.00004934616 standard atmosphere
- 6 pascal = 0.0000592154 standard atmosphere
- 7 pascal = 0.00006908463 standard atmosphere
- 8 pascal = 0.00007895386 standard atmosphere
- 9 pascal = 0.00008882309 standard atmosphere
- 10 pascal = 0.00009869233 standard atmosphere
- 12 pascal = 0.0001184308 standard atmosphere
- 15 pascal = 0.0001480385 standard atmosphere
- 20 pascal = 0.0001973847 standard atmosphere
- 25 pascal = 0.0002467308 standard atmosphere
- 30 pascal = 0.000296077 standard atmosphere
- 50 pascal = 0.0004934616 standard atmosphere
- 75 pascal = 0.0007401925 standard atmosphere
- 100 pascal = 0.0009869233 standard atmosphere
- 200 pascal = 0.001973847 standard atmosphere
- 500 pascal = 0.004934616 standard atmosphere
- 1000 pascal = 0.009869233 standard atmosphere
Pascal to Standard atmosphere conversion chart (both directions)
The chart below converts pascal to standard atmosphere and standard atmosphere to pascal side by side, so it works whichever way you need. 1 pascal = 0.000009869233 standard atmosphere, and 1 standard atmosphere = 101,325 pascal.
| Pascal → Standard atmosphere | Standard atmosphere → Pascal |
|---|---|
| 0.25 Pa = 0.000002467308 atm | 0.25 atm = 25,331.25 Pa |
| 0.5 Pa = 0.000004934616 atm | 0.5 atm = 50,662.5 Pa |
| 1 Pa = 0.000009869233 atm | 1 atm = 101,325 Pa |
| 2 Pa = 0.00001973847 atm | 2 atm = 202,650 Pa |
| 3 Pa = 0.0000296077 atm | 3 atm = 303,975 Pa |
| 4 Pa = 0.00003947693 atm | 4 atm = 405,300 Pa |
| 5 Pa = 0.00004934616 atm | 5 atm = 506,625 Pa |
| 6 Pa = 0.0000592154 atm | 6 atm = 607,950 Pa |
| 7 Pa = 0.00006908463 atm | 7 atm = 709,275 Pa |
| 8 Pa = 0.00007895386 atm | 8 atm = 810,600 Pa |
| 9 Pa = 0.00008882309 atm | 9 atm = 911,925 Pa |
| 10 Pa = 0.00009869233 atm | 10 atm = 1,013,250 Pa |
| 12 Pa = 0.0001184308 atm | 12 atm = 1,215,900 Pa |
| 15 Pa = 0.0001480385 atm | 15 atm = 1,519,875 Pa |
| 20 Pa = 0.0001973847 atm | 20 atm = 2,026,500 Pa |
| 25 Pa = 0.0002467308 atm | 25 atm = 2,533,125 Pa |
| 30 Pa = 0.000296077 atm | 30 atm = 3,039,750 Pa |
| 40 Pa = 0.0003947693 atm | 40 atm = 4,053,000 Pa |
| 50 Pa = 0.0004934616 atm | 50 atm = 5,066,250 Pa |
| 75 Pa = 0.0007401925 atm | 75 atm = 7,599,375 Pa |
| 100 Pa = 0.0009869233 atm | 100 atm = 10,132,500 Pa |
| 150 Pa = 0.001480385 atm | 150 atm = 15,198,750 Pa |
| 200 Pa = 0.001973847 atm | 200 atm = 20,265,000 Pa |
| 250 Pa = 0.002467308 atm | 250 atm = 25,331,250 Pa |
| 500 Pa = 0.004934616 atm | 500 atm = 50,662,500 Pa |
| 1000 Pa = 0.009869233 atm | 1000 atm = 101,325,000 Pa |
Pascal vs Standard atmosphere: which is bigger?
A standard atmosphere is the larger unit: one standard atmosphere equals 101,325 pascals. Put another way, you need 101,325 pascals to make a single standard atmosphere.
What is a Pascal? History, origin and usage
The pascal is named after Blaise Pascal, who in 1648 had his brother-in-law carry a mercury barometer up the Puy de Dôme in central France and watch the mercury column fall as he climbed. That experiment showed air has weight and that the pressure it exerts drops with height. The unit itself is much younger: the name was adopted by the General Conference on Weights and Measures in 1971, replacing the older habit of writing pressures as "newtons per square metre".
The pascal is the SI unit of pressure and the base every other unit on this page is defined against. On its own it is awkwardly small for daily life — a sheet of paper resting on a table presses down with only a few pascals — so real-world figures are almost always given with a prefix: hectopascals for weather, kilopascals for tyres and gas, megapascals for concrete and hydraulics.
One pascal is one newton spread over one square metre, which is about the pressure of a five-rupee coin lying flat on a table. Because pressure is force divided by area, the same push concentrated into a smaller area gives a much higher pressure — which is why a drawing pin goes into a wall and your thumb does not.
What is a Standard atmosphere? History, origin and usage
The standard atmosphere was fixed by the 10th General Conference on Weights and Measures in 1954 at exactly 101,325 pascals. Before that, "one atmosphere" meant whatever a 760 mm mercury column happened to weigh, which depended on local gravity and on the temperature of the mercury — so the same experiment gave slightly different answers in different laboratories. Fixing it as a defined number ended that.
Atmospheres are used in chemistry, physics, diving and any field that talks about pressure as a multiple of ordinary air pressure — reaction conditions, gas laws, hyperbaric medicine and pressure-vessel ratings.
It is a defined constant, not a measurement, so it never changes with the weather or with where you are standing. Real sea-level pressure wanders a few per cent either side of it every week. The deepest point of the ocean sits at roughly 1,100 atmospheres.
Convert 1 Pascal to other units
It can help to see a pascal next to the other units it is commonly compared with. One pascal (Pa) is equal to:
| 1 Pascal equals | Unit |
|---|---|
| 0.01 hPa | Hectopascal |
| 0.001 kPa | Kilopascal |
| 0.000001 MPa | Megapascal |
| 0.01 mbar | Millibar |
| 0.00001 bar | Bar |
| 0.000009869233 atm | Standard atmosphere |
| 0.007500617 Torr | Torr |
| 0.007500616 mmHg | Millimetre of mercury |
| 0.0002952998 inHg | Inch of mercury |
| 0.1019716 mmH₂O | Millimetre of water |
| 0.004014631 inH₂O | Inch of water |
| 0.0001450377 psi | Pound per square inch |
| 0.00001019716 kgf/cm² | Kilogram-force per square centimetre |
Convert 1 Standard atmosphere to other units
One standard atmosphere (atm) is equal to:
| 1 Standard atmosphere equals | Unit |
|---|---|
| 101,325 Pa | Pascal |
| 1,013.25 hPa | Hectopascal |
| 101.325 kPa | Kilopascal |
| 0.101325 MPa | Megapascal |
| 1,013.25 mbar | Millibar |
| 1.01325 bar | Bar |
| 760 Torr | Torr |
| 759.9999 mmHg | Millimetre of mercury |
| 29.92126 inHg | Inch of mercury |
| 10,332.27 mmH₂O | Millimetre of water |
| 406.7825 inH₂O | Inch of water |
| 14.69595 psi | Pound per square inch |
| 1.033227 kgf/cm² | Kilogram-force per square centimetre |
Tips for converting Pascal to Standard atmosphere
- To go from pascal to standard atmosphere, multiply by 0.000009869233; to go back, divide by 0.000009869233 (or multiply by 101,325).
- For a quick mental estimate, remember that 1 pascal ≈ 0.000009869233 standard atmosphere, so 10 pascal ≈ 0.00009869233 standard atmosphere.
- The converter above keeps full precision; the tables round for readability, so use the tool for exact figures.
- Both fields update live as you type — change either side to convert in that direction.
How to use this Pascal to Standard atmosphere converter
Type a number into the Pascal field and the equivalent in Standard atmosphere appears instantly — there is no “convert” button to press and nothing is sent to a server, so it works offline once the page has loaded and is safe for any data. You can also type into the Standard atmosphere field to convert the other way (standard atmosphere to pascal). Use the swap control to flip the two units, and copy the result with a single click. Because the calculation runs in your browser with full floating-point precision, the converter is more exact than the rounded figures shown in the reference chart above — use the chart for quick look-ups and the tool for precise work.
Accuracy and method
Every figure on this page — the formula, the worked examples, the conversion chart and the “convert to other units” tables — is computed from a single verified conversion factor (1 Pa = 0.000009869233 atm), never copied from a hand-typed lookup table that could drift. That factor is derived from each unit’s definition in terms of a common base unit, and an automated check re-verifies all of the site’s factors on every update, so the numbers here stay correct over time. This matters for pascal-to-standard atmosphere conversions because a small rounding error in a published table compounds quickly at larger quantities; computing from the exact factor avoids that.
Sources
- BIPM — The International System of Units (SI Brochure) — the defining document for the SI, published by the International Bureau of Weights and Measures. It fixes the base unit that this conversion resolves to, which is why the factor here can be exact rather than approximate.
- NIST — Definitions of the SI base units — the US National Institute of Standards and Technology reference for the SI base units, used here as an independent cross-check on the base-unit definition.
Pressure factors here come from fixed definitions, anchored to the pascal: a bar is exactly 100,000 Pa, one atmosphere is exactly 101,325 Pa, a torr is exactly a 760th of an atmosphere, and psi is built from the exact pound and the exact inch. Two of them — psi and the torr — work out to decimals that repeat forever, so where a number is shown rounded it is marked, not quietly trimmed.
Frequently asked questions
- How many standard atmosphere are in 1 pascal?
- 1 pascal = 0.000009869233 standard atmosphere (atm). To convert any number of pascal to standard atmosphere, multiply by 0.000009869233.
- How do I convert pascal to standard atmosphere?
- Multiply the number of pascal by 0.000009869233. For example, 10 pascal = 10 × 0.000009869233 = 0.00009869233 standard atmosphere, and 25 pascal = 0.0002467308 standard atmosphere.
- How many pascal are in 1 standard atmosphere?
- 1 standard atmosphere = 101,325 pascal. So to convert standard atmosphere back to pascal, multiply by 101,325.
- What is the formula to convert pascal to standard atmosphere?
- standard atmosphere = pascal × 0.000009869233. The reverse formula is pascal = standard atmosphere × 101,325.
- How much is 100 pascal in standard atmosphere?
- 100 pascal = 0.0009869233 standard atmosphere. (And 1000 pascal = 0.009869233 standard atmosphere.)
- Which is bigger, a pascal or a standard atmosphere?
- A standard atmosphere is larger: 1 standard atmosphere = 101,325 pascal.
- Is this pascal to standard atmosphere converter accurate?
- Yes — every value is computed from the exact 0.000009869233 atm per Pa factor (not rounded look-up tables), and the factors are re-verified automatically on every update.
- Can I convert standard atmosphere to pascal too?
- Yes. The converter works both ways — enter a value in either field. 1 standard atmosphere = 101,325 pascal.