Convert Standard atmosphere to Pascal
1 standard atmosphere = 101,325 pascal (Pa). For example, 10 standard atmosphere = 1,013,250 pascal and 100 standard atmosphere = 10,132,500 pascal. Type any value below to convert standard atmosphere to pascal both ways — it runs entirely in your browser.
Quick answer: Standard atmosphere to Pascal
1 Standard atmosphere = 101,325 Pascal (atm → Pa). To convert standard atmosphere to pascal, multiply by 101,325. To convert pascal to standard atmosphere, multiply by 0.000009869233. 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 standard atmosphere-to-pascal questions.
How to convert Standard atmosphere to Pascal
To convert standard atmosphere to pascal, multiply the number of standard atmosphere by the conversion factor 101,325, because 1 atm = 101,325 Pa. The conversion is linear, so the same factor works for any value — whole numbers, decimals or fractions. For the reverse direction, 1 Pa = 0.000009869233 atm, so you divide by 101,325 (or multiply by 0.000009869233) to turn pascal back into standard atmosphere.
Pa = atm × 101,325 ·
atm = Pa × 0.000009869233
- Write down the value you want to convert, in standard atmosphere.
- Multiply it by 101,325.
- The result is the same area/length/quantity expressed in pascal.
Standard atmosphere to Pascal — worked examples
Each row shows the exact arithmetic so you can follow the conversion step by step. For example, 5 standard atmosphere is 506,625 pascal because 5 atm × 101,325 = 506,625 Pa.
| Standard atmosphere | Calculation | Pascal |
|---|---|---|
| 1 atm | 1 atm × 101,325 = 101,325 Pa | 101,325 Pa |
| 2 atm | 2 atm × 101,325 = 202,650 Pa | 202,650 Pa |
| 3 atm | 3 atm × 101,325 = 303,975 Pa | 303,975 Pa |
| 5 atm | 5 atm × 101,325 = 506,625 Pa | 506,625 Pa |
| 7 atm | 7 atm × 101,325 = 709,275 Pa | 709,275 Pa |
| 10 atm | 10 atm × 101,325 = 1,013,250 Pa | 1,013,250 Pa |
| 12 atm | 12 atm × 101,325 = 1,215,900 Pa | 1,215,900 Pa |
| 15 atm | 15 atm × 101,325 = 1,519,875 Pa | 1,519,875 Pa |
| 20 atm | 20 atm × 101,325 = 2,026,500 Pa | 2,026,500 Pa |
| 25 atm | 25 atm × 101,325 = 2,533,125 Pa | 2,533,125 Pa |
| 50 atm | 50 atm × 101,325 = 5,066,250 Pa | 5,066,250 Pa |
| 100 atm | 100 atm × 101,325 = 10,132,500 Pa | 10,132,500 Pa |
Common Standard atmosphere to Pascal conversions
These are the standard atmosphere-to-pascal values people look up most often. Every figure is computed from the exact factor, so you can rely on them for quick reference:
- 1 standard atmosphere = 101,325 pascal
- 2 standard atmosphere = 202,650 pascal
- 2.5 standard atmosphere = 253,312.5 pascal
- 3 standard atmosphere = 303,975 pascal
- 4 standard atmosphere = 405,300 pascal
- 5 standard atmosphere = 506,625 pascal
- 6 standard atmosphere = 607,950 pascal
- 7 standard atmosphere = 709,275 pascal
- 8 standard atmosphere = 810,600 pascal
- 9 standard atmosphere = 911,925 pascal
- 10 standard atmosphere = 1,013,250 pascal
- 12 standard atmosphere = 1,215,900 pascal
- 15 standard atmosphere = 1,519,875 pascal
- 20 standard atmosphere = 2,026,500 pascal
- 25 standard atmosphere = 2,533,125 pascal
- 30 standard atmosphere = 3,039,750 pascal
- 50 standard atmosphere = 5,066,250 pascal
- 75 standard atmosphere = 7,599,375 pascal
- 100 standard atmosphere = 10,132,500 pascal
- 200 standard atmosphere = 20,265,000 pascal
- 500 standard atmosphere = 50,662,500 pascal
- 1000 standard atmosphere = 101,325,000 pascal
Standard atmosphere to Pascal conversion chart (both directions)
The chart below converts standard atmosphere to pascal and pascal to standard atmosphere side by side, so it works whichever way you need. 1 standard atmosphere = 101,325 pascal, and 1 pascal = 0.000009869233 standard atmosphere.
| Standard atmosphere → Pascal | Pascal → Standard atmosphere |
|---|---|
| 0.25 atm = 25,331.25 Pa | 0.25 Pa = 0.000002467308 atm |
| 0.5 atm = 50,662.5 Pa | 0.5 Pa = 0.000004934616 atm |
| 1 atm = 101,325 Pa | 1 Pa = 0.000009869233 atm |
| 2 atm = 202,650 Pa | 2 Pa = 0.00001973847 atm |
| 3 atm = 303,975 Pa | 3 Pa = 0.0000296077 atm |
| 4 atm = 405,300 Pa | 4 Pa = 0.00003947693 atm |
| 5 atm = 506,625 Pa | 5 Pa = 0.00004934616 atm |
| 6 atm = 607,950 Pa | 6 Pa = 0.0000592154 atm |
| 7 atm = 709,275 Pa | 7 Pa = 0.00006908463 atm |
| 8 atm = 810,600 Pa | 8 Pa = 0.00007895386 atm |
| 9 atm = 911,925 Pa | 9 Pa = 0.00008882309 atm |
| 10 atm = 1,013,250 Pa | 10 Pa = 0.00009869233 atm |
| 12 atm = 1,215,900 Pa | 12 Pa = 0.0001184308 atm |
| 15 atm = 1,519,875 Pa | 15 Pa = 0.0001480385 atm |
| 20 atm = 2,026,500 Pa | 20 Pa = 0.0001973847 atm |
| 25 atm = 2,533,125 Pa | 25 Pa = 0.0002467308 atm |
| 30 atm = 3,039,750 Pa | 30 Pa = 0.000296077 atm |
| 40 atm = 4,053,000 Pa | 40 Pa = 0.0003947693 atm |
| 50 atm = 5,066,250 Pa | 50 Pa = 0.0004934616 atm |
| 75 atm = 7,599,375 Pa | 75 Pa = 0.0007401925 atm |
| 100 atm = 10,132,500 Pa | 100 Pa = 0.0009869233 atm |
| 150 atm = 15,198,750 Pa | 150 Pa = 0.001480385 atm |
| 200 atm = 20,265,000 Pa | 200 Pa = 0.001973847 atm |
| 250 atm = 25,331,250 Pa | 250 Pa = 0.002467308 atm |
| 500 atm = 50,662,500 Pa | 500 Pa = 0.004934616 atm |
| 1000 atm = 101,325,000 Pa | 1000 Pa = 0.009869233 atm |
Standard atmosphere vs Pascal: 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 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.
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.
Convert 1 Standard atmosphere to other units
It can help to see a standard atmosphere next to the other units it is commonly compared with. 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 |
Convert 1 Pascal to other units
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 |
Tips for converting Standard atmosphere to Pascal
- To go from standard atmosphere to pascal, multiply by 101,325; to go back, divide by 101,325 (or multiply by 0.000009869233).
- For a quick mental estimate, remember that 1 standard atmosphere ≈ 101,325 pascal, so 10 standard atmosphere ≈ 1,013,250 pascal.
- 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 Standard atmosphere to Pascal converter
Type a number into the Standard atmosphere field and the equivalent in Pascal 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 Pascal field to convert the other way (pascal to standard atmosphere). 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 atm = 101,325 Pa), 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 standard atmosphere-to-pascal 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 pascal are in 1 standard atmosphere?
- 1 standard atmosphere = 101,325 pascal (Pa). To convert any number of standard atmosphere to pascal, multiply by 101,325.
- How do I convert standard atmosphere to pascal?
- Multiply the number of standard atmosphere by 101,325. For example, 10 standard atmosphere = 10 × 101,325 = 1,013,250 pascal, and 25 standard atmosphere = 2,533,125 pascal.
- How many standard atmosphere are in 1 pascal?
- 1 pascal = 0.000009869233 standard atmosphere. So to convert pascal back to standard atmosphere, multiply by 0.000009869233.
- What is the formula to convert standard atmosphere to pascal?
- pascal = standard atmosphere × 101,325. The reverse formula is standard atmosphere = pascal × 0.000009869233.
- How much is 100 standard atmosphere in pascal?
- 100 standard atmosphere = 10,132,500 pascal. (And 1000 standard atmosphere = 101,325,000 pascal.)
- Which is bigger, a standard atmosphere or a pascal?
- A standard atmosphere is larger: 1 standard atmosphere = 101,325 pascal.
- Is this standard atmosphere to pascal converter accurate?
- Yes — every value is computed from the exact 101,325 Pa per atm factor (not rounded look-up tables), and the factors are re-verified automatically on every update.
- Can I convert pascal to standard atmosphere too?
- Yes. The converter works both ways — enter a value in either field. 1 pascal = 0.000009869233 standard atmosphere.