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Pressure
Atmospheres to Megapascals
Convert atmospheres (atm) to megapascals (MPa). Type a value below to see the result update instantly. Reference table and formula included.
Calculator
1 atm = 0.101325 MPa
Atmospheres to Megapascals Conversion Table
Common values, ready to copy:
| atmospheres | megapascals |
|---|---|
| 1 atm | 0.101325 MPa |
| 2 atm | 0.20265 MPa |
| 5 atm | 0.506625 MPa |
| 10 atm | 1.0132 MPa |
| 25 atm | 2.5331 MPa |
| 50 atm | 5.0663 MPa |
| 100 atm | 10.1325 MPa |
| 1,000 atm | 101.33 MPa |
Formula
megapascals = atmospheres × 0.101325
Pressure is force per area. 1 atm = 101.325 kPa = 14.696 psi = 760 mmHg. Bar is a metric working unit close to atmospheric pressure (1 bar = 100 kPa).
About Atmospheres and Megapascals
Atmospheres (atm): Originally the average atmospheric pressure at sea level (101,325 Pa exactly); replaced in scientific work by the kilopascal but still used in chemistry and physiology. Common uses: Chemistry (gas-phase reactions, vapor pressure references), diving (depth pressure in atmospheres of seawater), and some compressed-gas contexts.
Megapascals (MPa): A million pascals, or 10 bar; the unit for high-pressure engineering contexts. Common uses: Concrete and steel strength specifications, hydraulic systems, deep-water pressures, and some industrial process measurements.
How the conversion works
Pressure is force per area. 1 atm = 101.325 kPa = 14.696 psi = 760 mmHg. Bar is a metric working unit close to atmospheric pressure (1 bar = 100 kPa).
The exact relationship is megapascals = atmospheres × 0.101325, which the calculator at the top of this page applies in both directions. Type into either field and the other updates immediately.
When this conversion matters
Converting between atmospheres and megapascals comes up wherever pressure measurements move between systems — from one country's conventions to another's, from a scientific reference to a practical specification, or from one industry's working unit to another's. The calculator and reference table above cover the everyday range; for unusual values you can type any number into either field.