Authoritative definitions of the International System of Units and SI prefixes.
Dedicated unit pair
Megapascals to Pounds per square inch
Convert MPa to psi instantly, then review the formula, assumptions, and rounding guidance.
Pressure & stressInstant result
Decimals
Formula result = input × 1000000 ÷ 6894.757293. 1 MPa = 145.0377 psi
Common examples
One value, several units
Pascals1,000,000 Pa
Kilopascals1,000 kPa
Bar10 bar
Atmospheres9.8692 atm
Pounds per square inch145.0377 psi
Millimetres of mercury7,500.6158 mmHg
Conversion table
| MPa | psi |
|---|---|
| 1 MPa | 145.0377 psi |
| 2 MPa | 290.0755 psi |
| 5 MPa | 725.1887 psi |
| 10 MPa | 1,450.3774 psi |
| 25 MPa | 3,625.9434 psi |
| 50 MPa | 7,251.8869 psi |
| 100 MPa | 14,503.7738 psi |
Conversion chart
1 MPa145.0377 psi
5 MPa725.1887 psi
10 MPa1,450.3774 psi
25 MPa3,625.9434 psi
50 MPa7,251.8869 psi
Worked example
Standard atmosphere is 101,325 pascals.
Unit definition
Megapascals (MPa) One megapascals equals 1,000,000 pascal.
Unit history
Megapascals 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 MPa to pascal.
3. Convert the base value to psi and apply your display precision.
Understand the result before using it
Megapascals to Pounds per square inch converts a value measured in Megapascals (MPa) into the equivalent value in Pounds per square inch (psi). 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 × 1000000 ÷ 6894.757293
Assumptions
- Megapascals and Pounds per square inch represent the same pressure & stress quantity.
- The input is expressed in MPa; the output is expressed in psi.
- The unit definitions and conventional relationship shown on this page apply.
Worked example
1 MPa = 145.037737734 psi. 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 MPa measurement in a document that expects psi.
- Compare a megapascals value with a value reported in pounds per square inch.
- Check the MPa-to-psi arithmetic before copying the result into another calculation.
Limitations
Common mistakes to avoid
- Do not confuse MPa 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 Megapascals to Pounds per square inch?
result = input × 1000000 ÷ 6894.757293 Using the displayed relationship, 1 MPa equals 145.037737734 psi.
How many Pounds per square inch are in one Megapascals?
One Megapascals is 145.037737734 Pounds per square inch. The displayed digits may be rounded.
Can I reverse the MPa to psi conversion?
Yes. Swap the source and target units in the converter. The reverse relationship converts psi back to MPa.
Is the Megapascals to Pounds per square inch 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.