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Millimetre of mercury to Hectopascal

Exact answer: 1 mmHg = 1.33322387415 hPa (exact defined factor)

Millimetre of mercury and Hectopascal describe the same quantity from the Pressure family but come from different systems of units. The factor is defined exactly. Pressure appears in tyre data, weather reports, hydraulics, gas cylinders and vacuum technology.

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From1 mmHg
Result1.333224 hPa
Factor1 mmHg = 1.33322387415 hPa
Source basisBIPM SI Brochure · NIST Guide to SI Appendix B.8

Examples

011 mmHg = 1.333224 hPa

Example value from the reference table. Internal calculation uses stored factors; display output is rounded.

02Common mistake

bar, psi and atm appear in different fields. Tyre, weather and lab values need context.

03Base unit: Pa

1 mmHg = 133.322387415 Pa. Then the value is converted through the base unit Pa into Hectopascal.

Table

Millimetre of mercury to Hectopascal
Millimetre of mercuryHectopascal
11.333224
1013.332239
100133.322387
500666.611937
7601,013.250144
1,0001,333.223874

Formula

1 mmHg = 133.322387415 Pa. Then the value is converted through the base unit Pa into Hectopascal.

Sources

BIPM SI BrochureSI base units, prefixes and official SI context.NIST Guide to SI Appendix B.8Alphabetical conversion factors including pressure and force units.

Related conversions

Millibar to Hectopascalmbar → hPaPressureHectopascal to MillibarhPa → mbarPressureInch of mercury to HectopascalinHg → hPaPressureHectopascal to Millimetre of mercuryhPa → mmHgPressure

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Factor origin

Factors come from the stored source family and are not derived from rounded display values.

Rounding rule

UnitCloud keeps calculating with stored factors and rounds only the displayed output by selected precision.

When not to use

Do not use as the sole basis for official, medical, safety-critical or contractual decisions.

Citation

Citation note: UnitCloud, conversion with formula, sources reviewed: September 2026. Pressure. Source basis: BIPM SI Brochure · NIST Guide to SI Appendix B.8.

Common questions

What is the factor for Millimetre of mercury to Hectopascal?

1 mmHg = 1.33322387415 hPa

Which formula does Millimetre of mercury to Hectopascal use?

1 mmHg = 133.322387415 Pa. Then the value is converted through the base unit Pa into Hectopascal.

What is the most common mistake?

bar, psi and atm appear in different fields. Tyre, weather and lab values need context.

When should I verify the result?

Do not use as the sole basis for official, medical, safety-critical or contractual decisions.