Direct answer

How Many atm in 1 Bar? 1 bar ≈ 0.986923 atm

1 bar equals about 0.986923 standard atmospheres. Weather and diving answer with bar ↔ atm converters.

Question

How many atmospheres are in one bar?

1 bar equals approximately 0.986923 atm (standard atmosphere).

1 bar

≈ 0.986923 atm

1 atm

≈ 1.01325 bar

1 bar

100,000 Pa (exact)

1 bar is defined as exactly 100,000 Pa. 1 standard atmosphere is 101,325 Pa.

Multiply bar by 0.986923 to get atm. Multiply atm by 1.01325 to get bar.

For rough weather talk, people often treat 1 bar ≈ 1 atm, but engineering work should keep the exact factors.