Atmosphere (std) to Millibar Converter
Convert Atmosphere (std) (atm) to Millibar (mbar) instantly. 1 atm = 1,013.25 mbar.
Pressure Converter
29 units available
1 atm = 1,013.25 mbar
Formula:
mbar = atm × 1,013.25With your value: 1 atm = 1,013.25 mbar
Other Atmosphere (std) to Millibar conversions
Atmosphere (std) to Millibar Conversion Table
| Atmosphere (std) (atm) | Millibar (mbar) |
|---|---|
| 0.5 | 506.625 |
| 1 | 1,013.25 |
| 2 | 2,026.5 |
| 5 | 5,066.25 |
| 10 | 10,132.5 |
| 15 | 15,198.75 |
| 20 | 20,265 |
| 25 | 25,331.25 |
| 50 | 50,662.5 |
| 100 | 101,325 |
| 250 | 253,312.5 |
| 500 | 506,625 |
| 1000 | 1,013,250 |
Millibar to Atmosphere (std) Conversion Table
| Millibar (mbar) | Atmosphere (std) (atm) |
|---|---|
| 0.5 | 0.000493 |
| 1 | 0.000987 |
| 2 | 0.001974 |
| 5 | 0.004935 |
| 10 | 0.009869 |
| 15 | 0.014804 |
| 20 | 0.019738 |
| 25 | 0.024673 |
| 50 | 0.049346 |
| 100 | 0.098692 |
| 250 | 0.246731 |
| 500 | 0.493462 |
| 1000 | 0.986923 |
Where these values come from
Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.
Atmosphere (std) (atm)
Pressure
The standard atmosphere is exactly 101 325 Pa.
Source: Units accepted for use with the SI, SI Brochure Table 8
Bureau International des Poids et Mesures · Reviewed 2026-07-01
Millibar (mbar)
Pressure
Derived from the pascal (1 Pa = 1 N/m²). The standard atmosphere is exactly 101 325 Pa.
Source: NIST Special Publication 811, Guide for the Use of the International System of Units
National Institute of Standards and Technology (US) · Reviewed 2026-07-01
How to Convert Atmosphere (std) to Millibar
To convert from Atmosphere (std) (atm) to Millibar (mbar), multiply the value by 1,013.25.
Formula: mbar = atm × 1,013.25
Reverse: atm = mbar × 0.0009869233
Step-by-Step Example
- Start with your value in Atmosphere (std). For example: 5 atm
- Multiply by the conversion factor: 5 x 1,013.25
- The result is: 5,066.25 mbar
About Atmosphere (std)
One standard atmosphere equals 101,325 Pascals and represents the average air pressure at sea level.
Common uses: diving, weather, chemistry.
About Millibar
The millibar (mbar) is a unit of pressure and stress. One millibar equals 100 pascals. UnitConvertLab converts it against every other pressure unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.
Common uses: pressure calculations, engineering and science, education.
Frequently Asked Questions
How many Millibar are in 1 Atmosphere (std)?
There are exactly 1,013.25 Millibar in 1 Atmosphere (std). This means the conversion factor from Atmosphere (std) to Millibar is 1,013.25.
What is the formula to convert Atmosphere (std) to Millibar?
The formula to convert Atmosphere (std) to Millibar is: mbar = atm × 1,013.25. For example, to convert 10 Atmosphere (std) to Millibar, you would multiply 10 by 1,013.25.
What is a Atmosphere (std)?
One standard atmosphere equals 101,325 Pascals and represents the average air pressure at sea level.
What is a Millibar?
The millibar (mbar) is a unit of pressure and stress. One millibar equals 100 pascals. UnitConvertLab converts it against every other pressure unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.
What are the common uses of Atmosphere (std)?
The Atmosphere (std) is commonly used in diving, weather, chemistry.
Related Pressure Conversions
Cite this page
UnitConvertLab. (2026). Atmosphere (std) to Millibar converter. UnitConvertLab. Retrieved from https://unitconvertlab.com/convert/atmosphere-to-millibar