atmospheres to psi

One standard atmosphere is exactly 101,325 pascals, and one psi is exactly 6894.757293168 pascals, so one atmosphere is exactly 14.69594877551 psi. Scuba divers live in atmospheres — every 33 feet of seawater adds one — and American pressure gauges read the same numbers in psi, which is why a dive computer's 2 atm depth readout is 29.39 psi on the tank gauge.

1 atmosphere = 14.69595 psi, and 1 psi = 0.06804596 atmospheres. One fixed factor covers the whole range: multiply atmospheres by 14.69595. Worked: 10 atmospheres = 146.9595 psi; 100 atmospheres = 1,469.595 psi.

By EnginStack Editorial Team | Reviewed against NIST, BIPM and primary-source documentation About →
atmospheres
29.39189755 psi
2 atmospheres = 29.39189755 psi 2 psi = 0.13609193 atmospheres

Constants verified against NIST Special Publication 811 (Guide for the Use of the International System of Units) and the 1959 International Yard and Pound Agreement. All values are exact — none are rounded approximations.

atmospheres to psi

The atmosphere is one of the oldest pressure units — defined by the weight of the Earth's air at sea level and fixed at exactly 101,325 Pa — while the psi is the American industrial unit built from the pound and inch definitions. Their ratio is exact: 101,325 / 6894.757293168 = 14.69594877551. Pressure-vessel ratings, diving decompression tables, and pneumatic specs all cross this line when an international standard meets a US gauge.

psi = atmospheres × 14.69594877551
1 atmosphere = 14.69594877551 psi — 101,325 Pa ÷ 6894.757293168 Pa/psi
The factor is exact from the standard atmosphere and psi definitions.

Worked Examples

Example 1: Convert one standard atmosphere

1 × 14.6959487755 = 14.696 psi

Example 2: Convert a diver at two atmospheres

2 × 14.6959487755 = 29.392 psi

Example 3: Convert a 200 atm cylinder rating

200 × 14.6959487755 = 2,939.19 psi

Common atmospheres to psi Conversions

atmospherespsiContext
1 atm14.70 psiStandard sea-level air pressure.
2 atm29.39 psiA scuba diver at 33 ft of seawater.
3 atm44.09 psiA diver at 66 ft.
10 atm146.96 psiA diver at 297 ft — the recreational limit.
200 atm2,939 psiA scuba cylinder's working pressure.

Engineering Context

The psi to atmospheres page inverts this factor. In the pressure hub, atm to Pa holds the 101,325 Pa anchor, psi to bar and psi to kPa carry the same pressure family. The 14.7 number also connects to the force family — psi is pound-force per square inch.

The number every diver is taught, one atmosphere per 33 feet of seawater, comes from this factor read in the opposite direction. Precisely, seawater of specific gravity 1.025 adds one atmosphere about every 33.07 feet, and fresh water about every 33.9 feet, so a dive table built on 33 feet carries a standing conservatism of a few percent. Above water the same 14.7 appears wherever atmospheric pressure is used as a reference: weather reports give 1,013 millibar, which is 0.9997 atm, and standard ratings for pressure vessels, gas cylinders and rupture discs are all quoted against this one figure.

More: psi to atm · atm to Pa · psi to kPa · Pressure Guide · Pressure Hub

Related Unit Converters

psi to atmospheres Atmospheres to Pascals psi to kPa Pressure Conversion Guide Pressure Converters

Frequently Asked Questions

How many psi is one atmosphere?

Exactly 14.69594877551 psi. One standard atmosphere is 101,325 Pa, and one psi is 6894.757293168 Pa, so the ratio is exact.

Why do scuba divers use atmospheres instead of psi?

Because depth pressure in atmospheres maps directly to decompression physiology — each 33 ft of seawater adds one atmosphere. The tank gauge still reads psi in US equipment, so divers routinely convert between the two.

What is 'one atmosphere' of pressure?

It is the average pressure exerted by Earth's atmosphere at sea level — defined as exactly 101,325 Pa (14.6959 psi, 760 torr, 1.01325 bar). It is the reference point for gauge pressure, which reads zero at one atmosphere.