Stress
N/mm²topsi
Convert newtons per square millimetre (stress) (N/mm²) to pounds-force per square inch (stress) (psi).
Factor1 N/mm² = 145.0377 psi
Converter
N/mm²
Accepts numbers or expressions, e.g. 150 + 14.7
Result
psi
Rendered to 6 significant figures.
Formula
Formula
psi = N/mm² × 145.0377
Multiply any value in newtons per square millimetre (stress) by 145.0377 to obtain the value in pounds-force per square inch (stress).
Worked example
Convert 1 N/mm² to psi.
- 01Start with 1 N/mm².
- 02Multiply by the conversion factor: 1 × 145.0377 = 145.038 psi.
Result1 N/mm² = 145.038 psi
Conversion table
| N/mm² | psi |
|---|---|
| 1 | 145.04 |
| 2 | 290.08 |
| 5 | 725.19 |
| 10 | 1450.4 |
| 20 | 2900.8 |
| 50 | 7251.9 |
| 100 | 14504 |
| 200 | 29008 |
| 500 | 72519 |
| 1000 | 1.4504e+5 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from N/mm² to psi?
1 N/mm² equals 145.0377 psi. To convert, multiply the value in newtons per square millimetre (stress) by 145.0377.
How do I convert 1 N/mm² to psi?
1 N/mm² = 145.038 psi. For any value, multiply by 145.0377.
How do I convert psi back to N/mm²?
Divide by the same factor — or equivalently, multiply by 0.006894757. So 1 psi = 0.00689476 N/mm².
When would I need to convert newton per square millimetre (stress) to pound-force per square inch (stress)?
Stress conversions between N/mm² and psi are routine in mechanics-of-materials work: yield, ultimate and allowable-stress specification, Young's-modulus tables and structural-design code calculations. MPa and N/mm² dominate ISO and European datasheets, psi and ksi dominate US structural codes, and kgf/cm² and kgf/mm² appear in legacy JIS and heavy-engineering documentation. Stress is the same physical dimension as pressure but a different engineering quantity — this category is mechanics-of-materials, not process pressure.
Is the conversion exact?
The factor shown is precise to at least 7 significant figures. For most process-engineering work this is far better than instrument accuracy. For metrology or trade applications, refer to the relevant national standard (NIST, BIPM, ISO 80000).
Related conversions
- psi → N/mm²pound-force per square inch (stress) → newton per square millimetre (stress)
- Pa → psipascal (stress) → pound-force per square inch (stress)
- psi → Papound-force per square inch (stress) → pascal (stress)
- Pa → N/mm²pascal (stress) → newton per square millimetre (stress)
- N/mm² → Panewton per square millimetre (stress) → pascal (stress)
- kPa → psikilopascal (stress) → pound-force per square inch (stress)