Pressure
inHgtoN/mm²
Convert inches of mercury (0 °C) (inHg) to newtons per square millimetre (N/mm²).
Factor1 inHg = 0.003386389 N/mm²
Converter
inHg
Accepts numbers or expressions, e.g. 150 + 14.7
Result
N/mm²
Rendered to 6 significant figures.
Formula
Formula
N/mm² = inHg × 0.003386389
Multiply any value in inches of mercury (0 °C) by 0.003386389 to obtain the value in newtons per square millimetre.
Worked example
Convert 100 inHg to N/mm².
- 01Start with 100 inHg.
- 02Multiply by the conversion factor: 100 × 0.003386389 = 0.338639 N/mm².
Result100 inHg = 0.338639 N/mm²
Conversion table
| inHg | N/mm² |
|---|---|
| 1 | 0.0033864 |
| 2 | 0.0067728 |
| 5 | 0.016932 |
| 10 | 0.033864 |
| 20 | 0.067728 |
| 50 | 0.16932 |
| 100 | 0.33864 |
| 200 | 0.67728 |
| 500 | 1.6932 |
| 1000 | 3.3864 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from inHg to N/mm²?
1 inHg equals 0.003386389 N/mm². To convert, multiply the value in inches of mercury (0 °C) by 0.003386389.
How do I convert 1 inHg to N/mm²?
1 inHg = 0.00338639 N/mm². For any value, multiply by 0.003386389.
How do I convert N/mm² back to inHg?
Divide by the same factor — or equivalently, multiply by 295.2998. So 1 N/mm² = 295.3 inHg.
When would I need to convert inch of mercury (0 °C) to newton per square millimetre?
Pressure conversions between inHg 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).