Convert atm to millibars
Standard atmospheres to millibars. Enter a value to convert, or use the atm to millibars chart further down the page.
1 standard atmosphere equals 1,013.25 millibars. Going the other way, 1 millibar = 0.0009869232667 standard atmospheres.
How to convert atm to millibars
To convert standard atmospheres to millibars, multiply the standard atmosphere value by 1013.25. You can also divide by 0.0009869232667 to get the same answer.
mbar = atm × 1013.25
Worked example
Convert 15 atm to millibars:
15 atm = 15,198.75 mbar
atm to millibars conversion chart
Use this atm to millibars table for quick reference without typing anything.
| standard atmospheres (atm) | millibars (mbar) |
|---|---|
| 0.01 atm | 10.1325 mbar |
| 0.1 atm | 101.325 mbar |
| 1 atm | 1,013.25 mbar |
| 2 atm | 2,026.5 mbar |
| 3 atm | 3,039.75 mbar |
| 5 atm | 5,066.25 mbar |
| 10 atm | 10,132.5 mbar |
| 20 atm | 20,265 mbar |
| 50 atm | 50,662.5 mbar |
| 100 atm | 101,325 mbar |
| 1,000 atm | 1,013,250 mbar |
What is a standard atmosphere?
The standard atmosphere is defined as exactly 101,325 pascals — the reference sea-level pressure.
What is a millibar?
A millibar is 100 pascals, identical to a hectopascal. It is the standard unit in weather reports.
Frequently asked questions
How many millibars are in a standard atmosphere?
1 atm equals 1,013.25 millibars. Going the other way, 1 millibars is 0.0009869232667 atm.
How do you convert atm to millibars?
To convert standard atmospheres to millibars, multiply the standard atmosphere value by 1013.25. You can also divide by 0.0009869232667 to get the same answer.
What is 10 atm in millibars?
10 atm equals 10,132.5 millibars. The conversion chart on this page lists the other values people look up most often.
Related pressure conversions
Convert atm to other units
Convert other units to millibars
- psi to millibars
- bar to millibars
- pascals to millibars
- kPa to millibars
- mmHg to millibars
- torr to millibars
- inHg to millibars
Popular conversions
cm to inchesinches to cmkg to lbslbs to kgCelsius to FahrenheitFahrenheit to Celsiusmm to inchesinches to mmkm to milesmiles to kmmeters to feetfeet to meterscm to feetfeet to inchesinches to feetml to fl ozfl oz to mlliters to gallonsgallons to literscups to ml