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Pressure

psitoN/mm²

Convert pounds-force per square inch (psi) to newtons per square millimetre (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 by 0.006894757 to obtain the value in newtons per square millimetre.

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 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 to newton per square millimetre?
Pressure conversions between psi and N/mm² are common when working with mixed-vendor instrumentation, when piping codes use different units to process datasheets, or when converting field readings into SI for hydraulic calculations.
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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