Atmosphere to Bar (atm to bar)
Result
1.01325 Bar
Formula
bar = atm × 1.01325
1 atm = 1.01325 bar, and 1 bar = 0.9869232667 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 × 1.01325 = 1.01325 bar
- 10 atm × 1.01325 = 10.1325 bar
- 100 atm × 1.01325 = 101.325 bar
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 Bar table
| Atmosphere (atm) | Bar (bar) |
|---|---|
| 1 | 1.01325 |
| 2 | 2.0265 |
| 5 | 5.06625 |
| 10 | 10.1325 |
| 20 | 20.265 |
| 50 | 50.6625 |
| 100 | 101.325 |
| 1,000 | 1,013.25 |
The units
- Atmosphere (atm)
- The standard atmosphere: exactly 101,325 Pa.
- Bar (bar)
- Exactly 100,000 Pa, about the atmospheric pressure at sea level.
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