Convert Millimeters of Mercury to kgf/mm²

Formula

kgf/mm² = mmHg × 0.0000135951

or kgf/mm² = mmHg ÷ 73555.91352767

Derivation from SI units:

• 1 mmHg = 13 595.1 kg/m³ × 9.80665 m/s² × 0.001 m = 133.322387415 Pa
• 1 kgf/mm² = 9.80665 N ÷ 1 mm² = 9.80665 MPa (exact)
• 1 mmHg = 133.322387415 Pa ÷ 9806650 Pa per kgf/mm² = 0.0000135951 kgf/mm²

Both units are defined exactly, so the factor is exact. Millimeter of Mercury definition: millimeter of mercury; Kilogram-force per Square Millimetre definition: kilogram-force per square millimetre.

Worked examples

1. A reading of 80 mmHg converts to 0.001087608 kgf/mm².
   80 mmHg × 0.0000135951 = 0.001087608 kgf/mm²
2. A value of 160 mmHg is 0.002175216 kgf/mm².
   160 mmHg × 0.0000135951 = 0.002175216 kgf/mm²

Where it's used

Millimeters of Mercury are used for blood pressure (e.g. 120/80 mmHg), while kilograms-force per square millimetre appear in tensile strength in older JIS and GB steel standards. Both measure pressure, stress and differential pressure (force per unit area), so the conversion is a fixed factor.

Millimeter of Mercury to other pressure units

Frequently asked questions

Sources

• Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "millimeter of mercury, conventional (mmHg)".
• Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "kilogram-force per square millimeter".

Last reviewed: 2026-10-15. Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.