Standard Atmosphere to Psi Converter

Convert between standard atmosphere (atm) and pounds per square inch (psi) for pressure measurements — 1 atm ≈ 14.6959487755 psi.

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Pressure Unit Conversion:

1 Standard Atmosphere (atm) ≈ 14.6959487755 Pounds per Square Inch (psi) | 1 psi ≈ 0.068046 atm

psi = atm × 14.6959487755 | atm = psi × 0.068046 (Results shown with 4 decimal places)

*Derived from: 1 atm = 101325 Pa; 1 psi ≈ 6894.76 Pa (101325 ÷ 6894.76 ≈ 14.6959487755)

atm

Standard atmosphere — reference pressure (sea level), used in meteorology, engineering

psi

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About Standard Atmosphere (atm) and Psi

Understanding pressure units for meteorology, engineering, and everyday applications.

Pressure Unit Comparison

Unit Symbol Equivalent in Pascals (Pa) Common Uses
Standard Atmosphere atm 101325 Pa (exact) Meteorology (weather reports), scientific reference, altitude pressure calculations
Pounds per Square Inch psi ≈ 6894.76 Pa Engineering (pipes, pressure vessels), automotive (tire pressure), hydraulics, industrial equipment

Common Pressure Conversions (4 decimal places)

Standard Atmosphere (atm) Psi Real-World Example
0.5 atm 7.3479 psi Atmospheric pressure at ~5,500m altitude (mountains)
1 atm 14.6959487755 psi Sea level atmospheric pressure (standard reference)
1.013 atm 14.8900 psi Typical car tire pressure (cold)
2 atm 29.3918 psi Water pressure at ~10m depth (diving)
3 atm 44.0878 psi Standard pressure in some industrial hydraulic systems

Frequently Asked Questions

About standard atmosphere, psi, and pressure unit conversions

Why is 1 standard atmosphere approximately 14.6959487755 psi?

The relationship is derived from the definition of both units in terms of Pascals (Pa), the SI unit of pressure:

  • 1 standard atmosphere (atm) is exactly defined as 101325 Pascals (Pa) by international agreement
  • 1 pound per square inch (psi) is defined as the pressure from 1 pound-force applied over 1 square inch, which equals approximately 6894.75729 Pa
  • Calculation: 1 atm = 101325 Pa ÷ 6894.75729 Pa/psi ≈ 14.6959488 psi (rounded to 14.6959487755 for practical use)

1 atm = 101325 Pa (exact)

1 psi ≈ 6894.76 Pa

1 atm to psi: 101325 ÷ 6894.76 ≈ 14.6959487755

1 psi to atm: 6894.76 ÷ 101325 ≈ 0.068046

When should I use atm vs. psi for pressure measurements?

The choice depends on the application context and regional conventions:

  • Standard Atmosphere (atm): Used for atmospheric pressure reference — meteorology (weather reports), altitude calculations, scientific experiments (as a baseline pressure). Example: "Atmospheric pressure today is 0.995 atm."
  • Psi (pounds per square inch): Used in engineering and industrial contexts — automotive (tire pressure), hydraulics, pressure vessels, compressed air systems. Example: "Tire pressure should be 32 psi cold."

Regional note: Psi is dominant in the United States for industrial and consumer applications, while atm is used globally as a scientific reference. Both are converted to Pascals (Pa) for SI-compliant engineering.

How do atm and psi relate to other pressure units like bar or kPa?

All pressure units can be converted through their Pascal equivalents:

1 atm = 1.01325 bar = 101.325 kPa = 14.6959487755 psi

1 bar = 0.9869 atm = 100 kPa = 14.5038 psi

1 kPa = 0.00987 atm = 0.01 bar = 0.1450 psi

1 psi = 0.0680 atm = 0.0689 bar = 6.8948 kPa

Practical examples of cross-unit conversion:

  • A car tire at 32 psi = 32 × 0.0680 atm ≈ 2.176 atm = 32 × 6.8948 kPa ≈ 220.63 kPa
  • Atmospheric pressure of 101 kPa = 101 ÷ 101.325 atm ≈ 0.997 atm = 101 × 0.1450 psi ≈ 14.645 psi
  • A hydraulic system at 5 bar = 5 × 1.01325 atm ≈ 5.066 atm = 5 × 14.5038 psi ≈ 72.519 psi

This converter focuses on atm↔psi, but the same Pascal-based logic applies when converting to other pressure units.

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