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Stress

psftoN/mm²

Convert pounds-force per square foot (stress) (psf) to newtons per square millimetre (stress) (N/mm²).

Factor1 psf = 4.788026e-5 N/mm²

Converter

psf

Accepts numbers or expressions, e.g. 150 + 14.7

Result
0.478803N/mm²

Rendered to 6 significant figures.

Formula

Formula
N/mm² = psf × 4.788026e-5

Multiply any value in pounds-force per square foot (stress) by 4.788026e-5 to obtain the value in newtons per square millimetre (stress).

Worked example

Convert 10000 psf to N/mm².

  1. 01Start with 10000 psf.
  2. 02Multiply by the conversion factor: 10000 × 4.788026e-5 = 0.478803 N/mm².
Result10000 psf = 0.478803 N/mm²

Conversion table

psfN/mm²
14.788e-5
29.5761e-5
50.0002394
100.0004788
200.00095761
500.002394
1000.004788
2000.0095761
5000.02394
10000.04788

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from psf to N/mm²?
1 psf equals 4.788026e-5 N/mm². To convert, multiply the value in pounds-force per square foot (stress) by 4.788026e-5.
How do I convert 1 psf to N/mm²?
1 psf = 4.78803e-5 N/mm². For any value, multiply by 4.788026e-5.
How do I convert N/mm² back to psf?
Divide by the same factor — or equivalently, multiply by 20885.43. So 1 N/mm² = 20885.4 psf.
When would I need to convert pound-force per square foot (stress) to newton per square millimetre (stress)?
Stress conversions between psf and N/mm² 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).

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