What is normal atmospheric pressure?

1 atm = 14.696 psi = 1.01325 bar = 101.325 kPa = 760 mmHg. Denver at 1 mile elevation has about 83% of this pressure.

Tire pressure - gauge or absolute?

Tire gauges read gauge pressure (pressure above atmospheric). 32 psi gauge is about 46.7 psi absolute. Always inflate to the manufacturer recommended gauge pressure.

Why do bar and atm differ?

Bar = 100 kPa exactly (metric engineering unit). Atm = 101.325 kPa (sea-level air pressure). They differ by about 1.3%. Most European pressure gauges use bar.

🌡️ Pressure Converter

Tire pressure in psi, weather in millibars, blood pressure in mmHg, SCUBA in atmospheres — pressure has more units than any other measurement.

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Last updated September 10, 2026 — conversions use exact ISO unit definitions.