Atmosphere (atm

1 Standard Atmosphere (1 atm) is the mean atmospheric pressure at sea level on Earth. In scuba diving, pressure increases by 1 atm for every 10 meters (33 feet) of ocean depth.

To use the Atmosphere (atm) Pressure Unit Converter, enter your Pressure Value, Unit to Convert From. The calculator instantly computes Standard Atmospheres (atm), Pascals (Pa) and more. Results update in real time as you change any input — no submit button needed.

How to Use This Calculator

Enter your Pressure Value (e.g. 1) and Unit to Convert From — choose from Standard Atmospheres (atm), Pascals (Pa), Kilopascals (kPa). Results update instantly as you type — adjust any value to compare scenarios.

The Formula

1 atm = 101,325 Pa = 101.325 kPa = 1.01325 bar = 14.6959 psi = 760 mmHg (Torr)

Seawater Depth Equivalent: Every 10 meters of depth adds ~1 atm of hydrostatic pressure

Worked Example

Convert 1 atm standard atmospheric pressure:

1 atm = 101,325 Pa = 101.325 kPa = 1.01325 bar = 14.6959 psi = 760.00 mmHg = 0 meters underwater depth.

Understanding Your Result

Unit conversions are exact by definition within a given measurement system (e.g., 1 km = exactly 1,000 m). Cross-system conversions (metric to imperial) use defined exchange factors: 1 inch = exactly 2.54 cm; 1 pound = 0.45359237 kg. Round your converted result to match the precision of your original measurement — expressing more decimal places than your input justifies implies false accuracy. For regulatory, legal, or safety-critical applications, verify which measurement system is required by the applicable standard.