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Stress

psitoN/mm²

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

Factor1 psi = 0.006894757 N/mm²

Converter

psi

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

Result
6.89476N/mm²

Rendered to 6 significant figures.

Formula

Formula
N/mm² = psi × 0.006894757

Multiply any value in pounds-force per square inch (stress) by 0.006894757 to obtain the value in newtons per square millimetre (stress).

Worked example

Convert 1000 psi to N/mm².

  1. 01Start with 1000 psi.
  2. 02Multiply by the conversion factor: 1000 × 0.006894757 = 6.89476 N/mm².
Result1000 psi = 6.89476 N/mm²

Conversion table

psiN/mm²
10.0068948
20.01379
50.034474
100.068948
200.1379
500.34474
1000.68948
2001.379
5003.4474
10006.8948

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from psi to N/mm²?
1 psi equals 0.006894757 N/mm². To convert, multiply the value in pounds-force per square inch (stress) by 0.006894757.
How do I convert 1 psi to N/mm²?
1 psi = 0.00689476 N/mm². For any value, multiply by 0.006894757.
How do I convert N/mm² back to psi?
Divide by the same factor — or equivalently, multiply by 145.0377. So 1 N/mm² = 145.038 psi.
When would I need to convert pound-force per square inch (stress) to newton per square millimetre (stress)?
Stress conversions between psi 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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