Skip to content
RK Calculator
Menu

Standard Atmospheres to Millibars Converter

Convert standard atmospheres (atm) to millibars (mbar), with the formula, a conversion table and exact factors.

Change the values and press Calculate to work out your own figures.

Enter a pressure, choose its unit and the unit you want. The answer is exact until it is shown, and the same value appears in every other unit.

A number, fraction (3/8), mixed number (1 1/2), scientific notation (2.5e6) or a simple sum such as 2*3.
The unit you want the answer in. Swap exchanges the two units.
Result
1,013.25 mbar
pascals
101,325 Pa
hectopascals
1,013.25 hPa
kilopascals
101.325 kPa
megapascals
0.101325 MPa
bars
1.01325 bar
kilograms-force per square centimeter
1.0332274528 kgf/cm²
kilograms-force per square meter
10,332.274528 kgf/m²
pounds per square inch
14.6959487755 psi
pounds per square foot
2,116.21662367 psf
torr
760 Torr
millimeters of mercury (conventional)
759.999891726 mmHg
inches of mercury (conventional)
29.9212555797 inHg

1 atm = 1,013.25 mbar

Show the working
  1. 1 atm = 1013.25 mbar
  2. 1 × 1013.25 = 1013.25 mbar

How to convert standard atmospheres to millibars

1 atm = 1,013.25 mbar, so multiply by 1,013.25 to go from standard atmospheres to millibars. Going the other way, 1 mbar = 0.000986923266716 atm.

mbar = atm × 1,013.25
atm = mbar × 0.000986923266716

Worked example:

1 atm = 1013.25 mbar
5 × 1013.25 = 5066.25 mbar

Standard Atmospheres to millibars table

Standard AtmospheresMillibars
1 atm1,013.25 mbar
2 atm2,026.5 mbar
3 atm3,039.75 mbar
4 atm4,053 mbar
5 atm5,066.25 mbar
6 atm6,079.5 mbar
7 atm7,092.75 mbar
8 atm8,106 mbar
9 atm9,119.25 mbar
10 atm10,132.5 mbar
15 atm15,198.75 mbar
20 atm20,265 mbar
25 atm25,331.25 mbar
30 atm30,397.5 mbar
40 atm40,530 mbar
50 atm50,662.5 mbar
75 atm75,993.75 mbar
100 atm101,325 mbar
250 atm253,312.5 mbar
500 atm506,625 mbar
1000 atm1,013,250 mbar

About the units

Standard Atmospheres (atm)
Standard atmospheres, a specialised unit. Definition: NIST SP 811 Appendix B.8, factors for units listed alphabetically.
Millibars (mbar)
Millibars, a metric unit. Definition: NIST SP 811 Appendix B.8, factors for units listed alphabetically.

Formula version 0.1.0Reviewed