atm to mbar Converter - Standard Atmosphere to Millibar
Standard Atmosphere (atm) to Millibar (mbar)
Direct answer
1 atm = 1,013.25 mbar
mbar = atm × 1,013.25
Converter
Conversion formula
mbar = atm × 1,013.25
atm = mbar × 0.000986923267
Example: 10 atm = 10 × 1,013.25 = 10,132.5 mbar.
Common conversion table
| atm | mbar |
|---|---|
| 1 atm | 1,013.25 mbar |
| 2 atm | 2,026.5 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 |
Conversion derivation
Express both atm and mbar in the same base unit Pa (pascal), then cancel the shared base unit.
- 1
Rewrite atm in the base unit
- 2
Rewrite mbar in the base unit
- 3
Forward conversion
- 4
Reverse conversion
AI explanation for this conversion
This pre-generated explanation is schema-checked. Numeric results still come from the page formula and calculator.
Explanation of the atm to mbar conversion factor
The conversion factor from standard atmospheres (atm) to millibars (mbar) is 1,013.25. This means one standard atmosphere equals 1,013.25 millibars.
Definition
A standard atmosphere (atm) is a unit of pressure defined as exactly 101,325 pascals (Pa). A millibar (mbar) is a unit of pressure defined as exactly 100 pascals (Pa).
Principle
The conversion factor is derived by expressing both units in the same base unit (pascals). The ratio of their definitions gives the factor: 101,325 Pa/atm divided by 100 Pa/mbar equals 1,013.25 mbar/atm.
Assumptions
- The definitions of the standard atmosphere and the millibar as given are exact.
- The conversion is based on these exact definitions in the pascal base unit.
Cautions
- The conversion factor is exact by definition, but results should be rounded to the precision required for the specific use case.
- The provided factor applies specifically to the standard atmosphere (atm) as defined here, not to other pressure units with similar names.
FAQ
How many mbar are in 1 atm?
1 atm = 1,013.25 mbar.
How many mbar are in 10 atm?
10 atm = 10,132.5 mbar.
How many mbar are in 100 atm?
100 atm = 101,325 mbar.
What is the formula to convert atm to mbar?
Use mbar = atm × 1,013.25.
How many atm are in 1 mbar?
1 mbar = 0.000986923267 atm.
What should I check when converting atm to mbar?
Use the conversion factor and round the result to the precision required by your calculation.