▸ processconvert
Pressure

psftoN/mm²

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

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 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 to newton per square millimetre?
Pressure conversions between psf 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).

Related conversions