Convert Atmosphere to Millibar
Input the number of atmospheres you want to convert to millibars.
How to Convert Atmospheres to Millibars
The atmosphere and millibar are both units of pressure. 1 atmosphere equals 1013.25 millibars. This means to convert atmospheres to millibars, you multiply by 1013.25.
Formula
Step-by-Step Example
Convert 5 atm to millibars:
We need to convert atmospheres to millibars
Since 1 atm = 1013.25 mbar, multiply by 1013.25
5 × 1013.25 = 5066.25
5 atm = 5066.25 mbar
Atmosphere to Millibar Conversion Table
Quick reference table for common atmosphere to millibar conversions. Click any value for detailed calculation.
| Atmospheres (atm) | Millibars (mbar) |
|---|---|
| 0.1 atm | 101.325 mbar |
| 0.5 atm | 506.625 mbar |
| 1 atm | 1013.25 mbar |
| 2 atm | 2026.5 mbar |
| 5 atm | 5066.25 mbar |
| 10 atm | 10132.5 mbar |
| 25 atm | 25331.25 mbar |
| 50 atm | 50662.5 mbar |
| 100 atm | 101325 mbar |
About These Units
Atmosphere (atm)
One standard atmosphere (atm) equals 101,325 Pascals, 1.01325 bar, or 14.696 PSI—the average air pressure at sea level. Atmospheres measure diving depth (every 10 meters adds ~1 atm), altitude effects, and chemical reactions. Used as a reference pressure in science.
Millibar (mbar)
A millibar (mbar) equals 100 Pascals or one hectopascal. Millibars are used in meteorology for atmospheric pressure and weather forecasting. Standard sea level pressure is 1013.25 mbar. Hurricanes have central pressures below 950 mbar.
Frequently Asked Questions
How do I convert atmospheres to millibars?
To convert atmospheres to millibars, multiply the value by 1013.25. For example, 10 atm = 10132.5 mbar.
How many millibars are in 1 atmosphere?
1 atmosphere equals 1013.25 millibars.
What is the formula for atmospheres to millibars?
The formula is: mbar = atm × 1013.25.