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Pressure

N/mm²topsi

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

Factor1 N/mm² = 145.0377 psi

Converter

N/mm²

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

Result
145.038psi

Rendered to 6 significant figures.

Formula

Formula
psi = N/mm² × 145.0377

Multiply any value in newtons per square millimetre by 145.0377 to obtain the value in pounds-force per square inch.

Worked example

Convert 1 N/mm² to psi.

  1. 01Start with 1 N/mm².
  2. 02Multiply by the conversion factor: 1 × 145.0377 = 145.038 psi.
Result1 N/mm² = 145.038 psi

Conversion table

N/mm²psi
1145.04
2290.08
5725.19
101450.4
202900.8
507251.9
10014504
20029008
50072519
10001.4504e+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 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 to pound-force per square inch?
Pressure conversions between N/mm² and psi 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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