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Stress

mmHgtohPa

Convert millimetres of mercury (stress) (mmHg) to hectopascals (stress) (hPa).

Factor1 mmHg = 1.333224 hPa

Converter

mmHg

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

Result
1.33322hPa

Rendered to 6 significant figures.

Formula

Formula
hPa = mmHg × 1.333224

Multiply any value in millimetres of mercury (stress) by 1.333224 to obtain the value in hectopascals (stress).

Worked example

Convert 1 mmHg to hPa.

  1. 01Start with 1 mmHg.
  2. 02Multiply by the conversion factor: 1 × 1.333224 = 1.33322 hPa.
Result1 mmHg = 1.33322 hPa

Conversion table

mmHghPa
11.3332
22.6664
56.6661
1013.332
2026.664
5066.661
100133.32
200266.64
500666.61
10001333.2

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from mmHg to hPa?
1 mmHg equals 1.333224 hPa. To convert, multiply the value in millimetres of mercury (stress) by 1.333224.
How do I convert 1 mmHg to hPa?
1 mmHg = 1.33322 hPa. For any value, multiply by 1.333224.
How do I convert hPa back to mmHg?
Divide by the same factor — or equivalently, multiply by 0.7500616. So 1 hPa = 0.750062 mmHg.
When would I need to convert millimetre of mercury (stress) to hectopascal (stress)?
Stress conversions between mmHg and hPa 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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