How many pascals are in one atmosphere?

One standard atmosphere (1 atm) equals exactly 101,325 pascals (Pa). This value is defined by ISO 31-4 and represents mean sea-level atmospheric pressure.

How do I convert atmospheres to pascals manually?

Multiply the atm value by 101,325. For example, 2 atm × 101,325 = 202,650 Pa.

What is the difference between atm and Pa?

The pascal (Pa) is the SI unit of pressure, equal to one newton per square meter. The standard atmosphere (atm) is a non-SI unit defined as exactly 101,325 Pa. Pascals are used in scientific work; atmospheres are common in chemistry, diving, and aviation where sea-level pressure is a natural reference.

What is 1 atm in kilopascals?

1 atm equals 101.325 kPa (kilopascals), since 1 kPa = 1,000 Pa and 1 atm = 101,325 Pa.

What is standard atmospheric pressure in Pa?

Standard atmospheric pressure is defined as exactly 101,325 Pa (101.325 kPa or ~14.696 psi). This is the reference point for the atm unit.

Can I convert partial atmospheres like 0.5 atm?

Yes. Multiply any atm value — including decimals — by 101,325. So 0.5 atm = 0.5 × 101,325 = 50,662.5 Pa.

Atmospheres to Pascals Converter

Enter a pressure in atmospheres and get the pascal equivalent instantly — includes reverse conversion and a reference table.

Converter

Pressure in atmospheres (atm)

Result in pascals (Pa)

Reverse: pascals to atmospheres

Pressure in Pa

Result in atm

Reference Table

Atmospheres (atm) Pascals (Pa)

0.001 atm 101.325 Pa

0.01 atm 1,013.25 Pa

0.1 atm 10,132.5 Pa

0.5 atm 50,662.5 Pa

1 atm 101,325 Pa

2 atm 202,650 Pa

5 atm 506,625 Pa

10 atm 1,013,250 Pa (1.01325 MPa)

50 atm 5,066,250 Pa (5.06625 MPa)

100 atm 10,132,500 Pa (10.1325 MPa)

1,000 atm 101,325,000 Pa (101.325 MPa)

Summary

This converter turns any atmosphere (atm) value into pascals (Pa) in real time using the exact factor 1 atm = 101,325 Pa as defined by the International Organization for Standardization. All math runs in your browser with no server round-trips. A reverse field lets you go from Pa back to atm, and a reference table covers common pressures from everyday weather to deep industrial applications.

How it works

Enter the pressure value in atmospheres in the top input field.
The converter multiplies your value by 101,325 to get pascals.
The result updates instantly as you type.
Use the reverse field to convert pascals back to atmospheres.
Click "Copy" next to any result to copy it to the clipboard.
Check the reference table for common atm-to-pascal values.

Use cases

Convert atmospheric pressure readings from atm to Pa for physics calculations.
Express diving depth pressures in pascals for engineering specifications.
Translate chemistry lab pressures from atm to the SI unit (Pa).
Cross-check meteorological data that mixes atm and Pa units.
Verify pressure vessel or autoclave ratings in pascal units.
Convert gas pressure values in atm to Pa for international datasheets.

Frequently Asked Questions

Last updated: 2026-06-18 · Reviewed by Nham Vu