Atmosphere to PSI (atm to psi)
Result
14.69594878 PSI
Formula
psi = atm × 14.69594878
1 atm = 14.69594878 psi, and 1 psi = 0.06804596391 atm.
The pascal is one newton per square metre. The bar is exactly 100,000 Pa, the standard atmosphere exactly 101,325 Pa, the torr exactly 1/760 atm, and psi is one pound-force per square inch (6,894.757 Pa).
Worked examples
- 1 atm × 14.69594878 = 14.695949 psi
- 10 atm × 14.69594878 = 146.95949 psi
- 100 atm × 14.69594878 = 1,469.5949 psi
Common mistakes
- Tyre and compressor gauges read gauge pressure — pressure above the surrounding air. Absolute pressure is about 1 atm (14.7 psi, 1.013 bar) higher.
- Weather maps use hectopascals (1 hPa = 100 Pa = 1 millibar); standard sea-level pressure is 1,013.25 hPa.
- Torr and mmHg differ by less than one part per million and are interchangeable for practical purposes.
Atmosphere to PSI table
| Atmosphere (atm) | PSI (psi) |
|---|---|
| 1 | 14.695949 |
| 2 | 29.391898 |
| 5 | 73.479744 |
| 10 | 146.95949 |
| 20 | 293.91898 |
| 50 | 734.79744 |
| 100 | 1,469.5949 |
| 1,000 | 14,695.949 |
The units
- Atmosphere (atm)
- The standard atmosphere: exactly 101,325 Pa.
- PSI (psi)
- Pound-force per square inch: 6,894.757293 Pa.
Sources for these factors
- The International System of Units (SI Brochure), 9th edition — BIPM
- Guide for the Use of the International System of Units (SP 811), Appendix B: conversion factors — NIST
Last reviewed against these sources. An automated check recomputes every factor from its definition on each build. How we check accuracy