Atmosphere → Millibar (atm → mbar)

atm to mbar direct conversion page with calculator, reverse conversion and comparison table.

1 atm = 1013.25 mbar
1 Atmosphere (atm) = 1013.25 Millibar (mbar).


swap converter

If you want to reverse convert, use Millibar → Atmosphere. 1 mbar = 0.00098692326671601 atm. You can also explore the full Pressure converter page for more cross conversions.

Conversion formula

Atmosphere to Millibar formula: value in mbar = value in atm × 1013.25.

Millibar to Atmosphere formula: value in atm = value in mbar × 0.00098692326671601.

How to convert Atmosphere to Millibar

To convert Atmosphere to Millibar, multiply the value in atm by 1013.25. This gives the result in mbar.

For example, 1 atm = 1013.25 mbar and 10 atm = 10132.5 mbar.

What is Atmosphere?

Atmosphere (atm): A reference pressure for comparing gas conditions, rather than a reading of today’s weather. 1 atm = 101 325 Pa.

What is Millibar?

Millibar (mbar): A familiar weather-map unit with the same numerical value as the hectopascal. 1 mbar = 100 Pa.

FAQ

How many millibar are in 1 atmosphere?

There are 1013.25 mbar in 1 atm.

Why can conversion results differ slightly?

Check the unit definition and rounding. US and imperial measures can differ; rounding intermediate values can also change the final digits.

How do I convert atmosphere to millibar?

Multiply the value in atm by 1013.25 to get the value in mbar.

Atmosphere → other Pressure units

Atmosphere → Millibar Table

The table below shows common values from Atmosphere to Millibar and the reverse direction for quick reference.

atmmbarRounded
1 atm1013.25 mbar1013.2500
2 atm2026.5 mbar2026.5000
3 atm3039.75 mbar3039.7500
4 atm4053 mbar4053.0000
5 atm5066.25 mbar5066.2500
10 atm10132.5 mbar10132.5000
12 atm12159 mbar12159.0000
15 atm15198.75 mbar15198.7500
20 atm20265 mbar20265.0000
25 atm25331.25 mbar25331.2500
30 atm30397.5 mbar30397.5000
40 atm40530 mbar40530.0000
50 atm50662.5 mbar50662.5000
75 atm75993.75 mbar75993.7500
100 atm101325 mbar101325.0000
200 atm202650 mbar202650.0000
250 atm253312.5 mbar253312.5000
500 atm506625 mbar506625.0000
750 atm759937.5 mbar759937.5000
1000 atm1013250 mbar1013250.0000
2500 atm2533125 mbar2533125.0000
5000 atm5066250 mbar5066250.0000
10000 atm10132500 mbar10132500.0000

Millibar → Atmosphere Table

mbaratmRounded
1 mbar0.00098692326671601 atm0.0010
2 mbar0.001973846533432 atm0.0020
3 mbar0.002960769800148 atm0.0030
4 mbar0.0039476930668641 atm0.0039
5 mbar0.0049346163335801 atm0.0049
10 mbar0.0098692326671601 atm0.0099
12 mbar0.011843079200592 atm0.0118
15 mbar0.01480384900074 atm0.0148
20 mbar0.01973846533432 atm0.0197
25 mbar0.0246730816679 atm0.0247
30 mbar0.02960769800148 atm0.0296
40 mbar0.039476930668641 atm0.0395
50 mbar0.049346163335801 atm0.0493
75 mbar0.074019245003701 atm0.0740
100 mbar0.098692326671601 atm0.0987
200 mbar0.1973846533432 atm0.1974
250 mbar0.246730816679 atm0.2467
500 mbar0.49346163335801 atm0.4935
750 mbar0.74019245003701 atm0.7402
1000 mbar0.98692326671601 atm0.9869
2500 mbar2.46730816679 atm2.4673
5000 mbar4.9346163335801 atm4.9346
10000 mbar9.8692326671601 atm9.8692

Millibar → Atmosphere

The reverse value is 1 mbar = 0.00098692326671601 atm.