Atmospheres to Millipascals converter
Convert atmospheres (atm) to Millipascals (mPa). Calculate a value, check the formula and compare common measurements.
Result for the values shown.
Calculations run in your browser.
What to enter
| Input | Meaning and units |
|---|---|
| Value | Enter value using the definition in the method and example. |
| From | Select the unit or currency in which the entered number is currently expressed. |
| To | Select the unit or currency you need for the answer. |
Understanding your result
The converted value describes the same pressure quantity in the selected target unit. Display rounding does not add precision to the original measurement.
Common mistakes
- Confusing the source and target units, or overlooking a prefix or case-sensitive symbol.
- Expecting a unit conversion to change gauge pressure into absolute pressure.
Check your calculation
- Convert to the target unit and then reverse the direction. Within display rounding, you should recover the original value.
Read the pressure measurement guide · Calculation checks, sources and review limits
How do I convert atmospheres to millipascals?
Enter the value in atmospheres to find the same pressure quantity in millipascals. The number changes to match the unit; the underlying quantity stays the same. Check the definitions below when a unit has more than one convention.
Common uses
- Interpret pressure specifications in a familiar unit.
- Compare pressure readings using consistent conventions.
How it works
For the displayed direction, 1 atm equals 101325000 mPa. The engine converts through the shared pressure base quantity. Atmospheres are standard atmospheres. Mercury-column factors use the conventional 0 °C definition; torr is 1/760 of a standard atmosphere. The multiplier is derived from the two centralized unit factors. Keep full precision until the final result; displayed answers use up to 12 significant digits. SI prefixes specify powers of ten: femto 10^-15, pico 10^-12, nano 10^-9, micro 10^-6, milli 10^-3, kilo 10^3, mega 10^6, giga 10^9 and tera 10^12. Unit symbols are case-sensitive. The numerical conversion uses the ratio of the source and target scale factors.
Worked example
10 atm converts to 1013250000 mPa. For the reverse direction, swap the units and enter 1013250000 mPa; the result is approximately 10 atm.
FAQ
How do I convert atm to mPa?
mPa = atm × 101325000
Which definition is used?
Atmospheres are standard atmospheres. Mercury-column factors use the conventional 0 °C definition; torr is 1/760 of a standard atmosphere.
Common values
Use “Swap units” above for the reverse conversion. Values below are rounded to six significant digits.
| atmospheres | Millipascals |
|---|---|
| 1 | 101325000 |
| 5 | 506625000 |
| 10 | 1013250000 |
| 20 | 2026500000 |
| 30 | 3039750000 |
| 50 | 5066250000 |
| 100 | 10132500000 |