Frequently Asked Questions
What is standard atmospheric pressure?
At sea level: 101,325 Pa = 1 atm = 1.01325 bar = 14.6959 psi = 760 mmHg = 29.92 inHg. Weather forecasts use hPa, where 1,013 hPa is "average."
PSI vs bar for tires?
1 bar equals 14.504 psi. A typical car tire at 32 psi is about 2.2 bar. European pumps usually display bar; US pumps display psi.
Why is blood pressure in mmHg?
Historic mercury manometers measured pressure as the height of a mercury column. 120 mmHg systolic equals 16 kPa; mmHg stuck because all the medical reference ranges are in it.
How does altitude affect pressure?
Pressure drops about 12% per 1,000 m of altitude near the surface. Denver (1,610 m) sits around 83 kPa; Everest summit is around 33 kPa, a third of sea level.
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This calculator provides estimates for informational purposes only. Results are based on assumptions and may not reflect actual outcomes. Consult qualified professionals in relevant fields before making important decisions based on these results.