This converter turns atmospheres into pascals instantly, using the exact factor 1 atmosphere = 101325 pascals. Type any number and the result updates as you go — nothing is sent to a server, so the arithmetic happens entirely in your browser.
Standard atmospheric pressure by definition — 101,325 pascals exactly. The SI unit: one newton per square metre.
Because the relationship is a simple proportion, one multiplication does the whole job. The table further down gives pre-computed values for the amounts people look up most often, and the result panel also reports the reverse conversion so you can check the figure both ways.
The formula
atmospheres- The amount you are converting, measured in atmospheres
101325- The exact number of pascals in one atmosphere
pascals- The converted result
How it works, step by step
- Enter the number of atmospheres you want to convert.
- The value is multiplied by 101325, the exact conversion factor.
- The result is displayed in pascals, rounded for readability.
- The unrounded value and the reverse conversion appear underneath so you can verify it.
Worked examples
Converting 5 atmospheres
Multiply 5 by 101325. That gives 506,625 pascals. A quick sanity check: one atmosphere is larger than one pascal, so the number should get bigger — and it does.
Converting 72 atmospheres
72 × 101325 = 7,295,400 pascals. Working backwards, 7,295,400 ÷ 101325 returns 72 atmospheres, which confirms the factor is applied the right way round.
How to read your score
Frequently asked questions
How many pascals are in one atmosphere?
Exactly 101325. Every conversion on this page is that single number multiplied by your input, so the result carries no rounding error beyond what is shown.
What is the formula to convert atmospheres to pascals?
Pascals = atmospheres × 101325. To reverse it, divide instead: atmospheres = pascals ÷ 101325, which is the same as multiplying by 9.869232667e-06.
Is the atmosphere bigger than the pascal?
Yes. One atmosphere equals 101325 pascals, so it is the larger unit.
Why does my answer differ slightly from other atmospheres to pascals converters?
Most differences come from rounding the factor too early. This tool keeps full double precision through the calculation and only rounds at the final display step, and it also shows the unrounded value so you can see exactly where any difference appears.
What is a atmosphere?
Standard atmospheric pressure by definition — 101,325 pascals exactly.
What is a pascal?
The SI unit: one newton per square metre.
Atmospheres to pascals reference table
| Atmospheres | Pascals |
|---|---|
| 0.5 atm | 50,662.5 Pa |
| 1 atm | 101,325 Pa |
| 2 atm | 202,650 Pa |
| 3 atm | 303,975 Pa |
| 5 atm | 506,625 Pa |
| 10 atm | 1,013,250 Pa |
| 15 atm | 1,519,875 Pa |
| 20 atm | 2,026,500 Pa |
| 25 atm | 2,533,125 Pa |
| 50 atm | 5,066,250 Pa |
| 75 atm | 7,599,375 Pa |
| 100 atm | 10,132,500 Pa |
| 250 atm | 25,331,250 Pa |
| 500 atm | 50,662,500 Pa |
| 1000 atm | 101,325,000 Pa |
Exact factor: 1 atmosphere = 101325 pascals. Values rounded for display.