Direct conversion
Result
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All equivalent units
Gauge / absolute converter
Absolute pressure
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Atmospheric reference
Sea-level standard atmosphere: 101.325 kPa.
Engineering note
Gauge pressure depends on the actual local atmosphere. Altitude estimation uses the ISA tropospheric approximation and is not a substitute for a measured barometric reference.
Core constants
| Unit | Pa per unit |
|---|
Water-column assumptions
Water-column units use conventional standard gravity g₀ = 9.80665 m/s² and conventional water density ρ = 1000 kg/m³, giving 1 mmH₂O = 9.80665 Pa. Mercury units use conventional definitions.