How many kilopascals is 1 atmosphere?

1 standard atmosphere (atm) equals exactly 101.325 kilopascals (kPa). This is defined by the International System of Units and matches the average air pressure at sea level.

How do I convert atm to kPa manually?

Multiply the atmosphere value by 101.325. For example, 2 atm × 101.325 = 202.65 kPa. To convert kPa back to atm, divide by 101.325.

What is the difference between atm and kPa?

Atmosphere (atm) is a non-SI unit defined as the average air pressure at sea level. Kilopascal (kPa) is the SI-preferred unit for pressure and equals 1,000 pascals. Scientific and engineering contexts increasingly favor kPa, while atm remains common in chemistry and diving.

What is standard atmospheric pressure in kPa?

Standard atmospheric pressure is defined as exactly 101.325 kPa (or 101,325 Pa). This value is often approximated as 100 kPa (1 bar) for quick estimates, though the precise figure is 101.325 kPa.

What is 2 atm in kPa?

2 atmospheres equals 202.65 kPa. This pressure is roughly what you experience at 10 meters underwater, and it is a common reference point in scuba diving.

Is atm or kPa more accurate?

Both are equally accurate — they express the same physical quantity on different scales. kPa is the SI unit and is preferred in scientific writing. Atmosphere is convenient because everyday air pressure is approximately 1 atm, making it easy to reason about relative pressures.

Atmospheres to Kilopascals Converter

Name: Atmospheres to Kilopascals Converter
Availability: InStock
Author: Nham Vu

Enter a pressure in atmospheres and get the kilopascal (kPa) equivalent instantly, with reverse kPa-to-atm conversion included.

Converter

Pressure in atmospheres (atm)

Result in kilopascals (kPa)

Reverse: kilopascals to atmospheres

Pressure in kPa

Result in atm

Reference Table

Atmospheres (atm) Kilopascals (kPa)

0.1 atm 10.133

0.5 atm 50.663

1 atm 101.325

1.5 atm 151.988

2 atm 202.650

3 atm 303.975

5 atm 506.625

10 atm 1,013.25

15 atm 1,519.88

20 atm 2,026.50

50 atm 5,066.25

100 atm 10,132.50

Summary

Enter a pressure in atmospheres and get the kilopascal (kPa) equivalent instantly, with reverse kPa-to-atm conversion included.

How it works

Enter the pressure value in atmospheres (atm) in the top input field.
The kilopascal (kPa) result appears instantly with no button press needed.
Use the reverse field to convert kilopascals back to atmospheres.
Click "Copy" next to any result to copy the value to your clipboard.
Check the reference table for common atm-to-kPa values at a glance.

Use cases

Convert standard atmospheric pressure (1 atm) to kPa for scientific calculations.
Translate lab gas cylinder pressure specs from atm to kPa.
Convert atmospheric diving depth pressure readings into kPa for safety logs.
Compare weather pressure data given in atm against kPa-based forecasts.
Convert chemistry textbook pressures from atm to kPa for SI unit compliance.
Check industrial process pressures on datasheets that mix atm and kPa units.
Verify HVAC or boiler specs when switching between atm and kPa measurements.
Convert altitude pressure values from atm to kPa in aerospace calculations.

Frequently Asked Questions

Last updated: 2026-07-01 · Reviewed by Nham Vu