standard atmospheres (atm)

standard atmospheres as a conversion hub: 7 direct pairs, all with the exact factor on the page.

Definition1 atm = 101.325 kPa exactly

CategoryPressure Converter

Pairs from here7

Pressure Converter

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standard atmospheres converted to every other unit

atm	kPa	bar	psi	mmHg	inHg	hPa	MPa
1 atm	101.325	1.01325	14.695949	760	29.921252	1,013.25	0.101325
2 atm	202.65	2.0265	29.391898	1,520	59.842505	2,026.5	0.20265
5 atm	506.625	5.06625	73.479744	3,800	149.606	5,066.25	0.506625
10 atm	1,013.25	10.1325	146.959	7,600	299.213	10,132.5	1.01325
20 atm	2,026.5	20.265	293.919	15,200	598.425	20,265	2.0265
50 atm	5,066.25	50.6625	734.797	37,999.99	1,496.06	50,662.5	5.06625
100 atm	10,132.5	101.325	1,469.59	75,999.99	2,992.13	101,325	10.1325

All conversions starting from atm

atm to kPa atm to bar atm to psi atm to mmHg atm to inHg atm to hPa atm to MPa

Questions

How do I convert from standard atmospheres?

Pick the target unit from the table on this page, or open the dedicated pair page — each one carries a converter, a table of common values and the exact factor.

Is standard atmosphere exact or approximate?

The factor shown (1 atm = 101.325 kPa) is fixed by definition, so conversions are exact rather than measured.

What is standard atmosphere used for?

standard atmospheres as used in practical measurements