Authoritative definitions of the International System of Units and SI prefixes.
Unit conversion
Atmospheres to Megapascals Converter
1 atm = 0.101325 MPa. Enter a value to convert atm to MPa, then use the formula and table below. Displayed digits may be rounded.
Pressure & stressInstant result
Decimals
Formula result = input × 101325 ÷ 1000000. 1 atm ≈ 0.1013 MPa
Nonzero results too small for the selected decimal places use scientific notation.
Nonzero results too small for the selected decimal places use scientific notation.
Common examples
One value, several units
Pascals101,325 Pa
Kilopascals101.325 kPa
Megapascals0.1013 MPa
Bar1.0133 bar
Pounds per square inch14.6959 psi
Millimetres of mercury759.9999 mmHg
Conversion table
| atm | MPa |
|---|---|
| 1 atm | 0.1013 MPa |
| 2 atm | 0.2027 MPa |
| 5 atm | 0.5066 MPa |
| 10 atm | 1.0133 MPa |
| 25 atm | 2.5331 MPa |
| 50 atm | 5.0663 MPa |
| 100 atm | 10.1325 MPa |
Conversion chart
1 atm0.1013 MPa
5 atm0.5066 MPa
10 atm1.0133 MPa
25 atm2.5331 MPa
50 atm5.0663 MPa
Worked example
1 atm = 0.101325 MPa. Apply the selected conversion formula to other input values.
Unit definition
Atmospheres (atm) One atmospheres equals 101,325 pascal.
Unit history
Atmospheres is represented here using its modern SI definition or an internationally accepted relationship to an SI base unit.
Step by step
1. Parse the value, including fractions.
2. Convert atm to pascal.
3. Convert the base value to MPa and apply your display precision.
Understand the result before using it
Atmospheres to Megapascals converts a value measured in Atmospheres (atm) into the equivalent value in Megapascals (MPa). The numerical value changes because the size and definition of the selected unit changes; the underlying quantity does not.
Calculated result
The conversion follows the displayed unit relationship. Display rounding can hide additional digits, and measured inputs cannot become more accurate merely by changing units.
Formula, assumptions, and example
Formula
result = input × 101325 ÷ 1000000
Assumptions
- Atmospheres and Megapascals represent the same pressure & stress quantity.
- The input is expressed in atm; the output is expressed in MPa.
- The unit definitions and conventional relationship shown on this page apply.
Worked example
1 atm = 0.101325 MPa. For another value, apply the same relationship and round only to the precision your source measurement supports.
When to use it
Good uses
- Read a atm measurement in a document that expects MPa.
- Compare a atmospheres value with a value reported in megapascals.
- Check the atm to MPa arithmetic before copying the result into another calculation.
Limitations
Common mistakes to avoid
- Do not confuse atm with another unit that has a similar name or symbol.
- Round the output to a precision justified by the original measurement.
- Verify safety-critical, regulated, laboratory, and contractual conversions against the controlling standard.
Sources and further reading
These references explain the underlying standards or provide authoritative context. Your own contract, institution, clinician, product documentation, local code, or governing standard may be the controlling source.
Guidance on unit names, symbols, conversions, and numerical presentation.
Questions about this calculation
How do I convert Atmospheres to Megapascals?
result = input × 101325 ÷ 1000000. Input is in atm; result is in MPa. 1 atm = 0.101325 MPa. The displayed digits may be rounded.
What is 1 atm in MPa?
1 atm = 0.101325 MPa. The displayed digits may be rounded.
Can I reverse the atm to MPa conversion?
Yes. Swap the source and target units in the converter. The reverse relationship converts MPa back to atm.
Is the Atmospheres to Megapascals result exact?
The conversion follows the displayed unit relationship. Display rounding can hide additional digits, and measured inputs cannot become more accurate merely by changing units.