Stress
N/mm²topsf
Convert newtons per square millimetre (stress) (N/mm²) to pounds-force per square foot (stress) (psf).
Factor1 N/mm² = 20885.43 psf
Converter
N/mm²
Accepts numbers or expressions, e.g. 150 + 14.7
Result
psf
Rendered to 6 significant figures.
Formula
Formula
psf = N/mm² × 20885.43
Multiply any value in newtons per square millimetre (stress) by 20885.43 to obtain the value in pounds-force per square foot (stress).
Worked example
Convert 1 N/mm² to psf.
- 01Start with 1 N/mm².
- 02Multiply by the conversion factor: 1 × 20885.43 = 20885.4 psf.
Result1 N/mm² = 20885.4 psf
Conversion table
| N/mm² | psf |
|---|---|
| 1 | 20885 |
| 2 | 41771 |
| 5 | 1.0443e+5 |
| 10 | 2.0885e+5 |
| 20 | 4.1771e+5 |
| 50 | 1.0443e+6 |
| 100 | 2.0885e+6 |
| 200 | 4.1771e+6 |
| 500 | 1.0443e+7 |
| 1000 | 2.0885e+7 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from N/mm² to psf?
1 N/mm² equals 20885.43 psf. To convert, multiply the value in newtons per square millimetre (stress) by 20885.43.
How do I convert 1 N/mm² to psf?
1 N/mm² = 20885.4 psf. For any value, multiply by 20885.43.
How do I convert psf back to N/mm²?
Divide by the same factor — or equivalently, multiply by 4.788026e-5. So 1 psf = 4.78803e-5 N/mm².
When would I need to convert newton per square millimetre (stress) to pound-force per square foot (stress)?
Stress conversions between N/mm² and psf 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
- psf → N/mm²pound-force per square foot (stress) → newton per square millimetre (stress)
- Pa → psfpascal (stress) → pound-force per square foot (stress)
- psf → Papound-force per square foot (stress) → pascal (stress)
- Pa → N/mm²pascal (stress) → newton per square millimetre (stress)
- N/mm² → Panewton per square millimetre (stress) → pascal (stress)
- kPa → psfkilopascal (stress) → pound-force per square foot (stress)