Convert Bar to Atmospheres
Instantly convert Bar (bar) to Atmospheres (atm) with our free online calculator.
Formula: bar to atm — multiply by 0.986923
Reference Table
| Bar (bar) | Atmospheres (atm) |
|---|---|
| 1 | 0.986923 |
| 5 | 4.93462 |
| 10 | 9.86923 |
| 25 | 24.6731 |
| 50 | 49.3462 |
| 100 | 98.6923 |
How to Convert Bar to Atmospheres
Formula
To convert Bar (bar) to Atmospheres (atm): multiply by 0.986923
Step-by-Step
- Start with your value in Bar (bar).
- Multiply by 0.986923 to perform the conversion.
- The result is your value expressed in Atmospheres (atm).
Conversion Factor
1 bar = 0.986923 atm
Reverse Factor
1 atm = 1.01325 bar
Worked Example
Convert 25 Bar to Atmospheres: 25 bar = 24.6731 atm
About Bar (bar)
A metric unit of pressure equal to exactly 100,000 pascals (100 kPa), approximately the average sea-level atmospheric pressure on Earth (1 atm = 1.01325 bar). Defined by IUPAC and accepted for use with the SI by the BIPM, the bar is not itself an SI-proper unit but is universally recognized in engineering. Bars are the default unit in European industry for compressed gas systems (compressed air at 6-10 bar shop pressure), hydraulics (mobile equipment at 200-400 bar working pressure), and chemical process plants. Car tire pressures in much of the world outside the US are specified in bar (a typical passenger car runs ~2.2 bar / 32 psi cold). Gauges on scuba cylinders (200 bar fill / ~2900 psi), brewery CO₂ tanks, fire suppression systems, and espresso machines (9 bar extraction pressure) all read in bar. 1 bar = 14.504 psi = 100 kPa = 0.9869 atm.
About Atmosphere (atm)
A non-SI unit of pressure defined as exactly 101,325 pascals, corresponding to the standard sea-level atmospheric pressure as adopted by ISO 2533 and the BIPM SI Brochure. Atmospheres are the default reference pressure in physical chemistry (Standard Temperature and Pressure conventions: 1 atm at 273.15 K under IUPAC's 'STP' definition, though IUPAC has since moved to 1 bar STP), in commercial diving (depths are quoted in atmospheres absolute, with each 10 m of seawater adding ~1 atm), and in pressure-sensitive materials research where vapor pressure and saturation data are tabulated at 1 atm. A common pitfall: the "technical atmosphere" (at, 98,066.5 Pa = 1 kgf/cm²) used in some legacy European and Japanese engineering is NOT the same as the standard atmosphere — older pressure-vessel drawings can read 100 at and mean either depending on context. 1 atm = 1.01325 bar = 14.696 psi = 760 mmHg = 760 torr.
Quick Facts
- 1 Bar equals 0.986923 Atmospheres
- 1 Atmosphere equals 1.01325 Bar
- Bar is a unit of pressure
- Atmosphere is a unit of pressure
- This conversion is commonly used in tire inflation, weather reporting, scuba diving, and engineering
- The Bar belongs to the metric system
Common Bar to Atmosphere Conversions
| Bar (bar) | Atmospheres (atm) |
|---|---|
| 0.1 | 0.0986923 |
| 0.5 | 0.493462 |
| 1 | 0.986923 |
| 2 | 1.97385 |
| 5 | 4.93462 |
| 10 | 9.86923 |
| 14.696 | 14.5038 |
| 15 | 14.8038 |
| 20 | 19.7385 |
| 25 | 24.6731 |
| 50 | 49.3462 |
| 100 | 98.6923 |
| 150 | 148.038 |
| 200 | 197.385 |
| 500 | 493.462 |
| 1000 | 986.923 |
Understanding Bar
The Bar (symbol: bar) is a unit of pressure. A metric unit of pressure equal to exactly 100,000 pascals (100 kPa), approximately the average sea-level atmospheric pressure on Earth (1 atm = 1.01325 bar). Defined by IUPAC and accepted for use with the SI by the BIPM, the bar is not itself an SI-proper unit but is universally recognized in engineering. Bars are the default unit in European industry for compressed gas systems (compressed air at 6-10 bar shop pressure), hydraulics (mobile equipment at 200-400 bar working pressure), and chemical process plants. Car tire pressures in much of the world outside the US are specified in bar (a typical passenger car runs ~2.2 bar / 32 psi cold). Gauges on scuba cylinders (200 bar fill / ~2900 psi), brewery CO₂ tanks, fire suppression systems, and espresso machines (9 bar extraction pressure) all read in bar. 1 bar = 14.504 psi = 100 kPa = 0.9869 atm.
It belongs to the metric measurement system.
Bar are commonly used in tire inflation, weather reporting, scuba diving, and engineering.
Understanding Atmospheres
The Atmosphere (symbol: atm) is a unit of pressure. A non-SI unit of pressure defined as exactly 101,325 pascals, corresponding to the standard sea-level atmospheric pressure as adopted by ISO 2533 and the BIPM SI Brochure. Atmospheres are the default reference pressure in physical chemistry (Standard Temperature and Pressure conventions: 1 atm at 273.15 K under IUPAC's 'STP' definition, though IUPAC has since moved to 1 bar STP), in commercial diving (depths are quoted in atmospheres absolute, with each 10 m of seawater adding ~1 atm), and in pressure-sensitive materials research where vapor pressure and saturation data are tabulated at 1 atm. A common pitfall: the "technical atmosphere" (at, 98,066.5 Pa = 1 kgf/cm²) used in some legacy European and Japanese engineering is NOT the same as the standard atmosphere — older pressure-vessel drawings can read 100 at and mean either depending on context. 1 atm = 1.01325 bar = 14.696 psi = 760 mmHg = 760 torr.
Atmospheres are commonly used in tire inflation, weather reporting, scuba diving, and engineering.
Why Convert Bar to Atmospheres?
Engineers, mechanics, and scientists frequently need to convert pressure between Bar and Atmospheres when working with different measurement standards. Tire pressure, blood pressure readings, weather barometric measurements, and industrial process specifications may all use different pressure units depending on the region or discipline. Reliable conversion prevents equipment misuse and ensures safety.
Frequently Asked Questions
How do I convert Bar to Atmospheres?
A metric unit of pressure equal to exactly 100,000 pascals (100 kPa), approximately the average sea-level atmospheric pressure on Earth (1 atm = 1. To convert Bar to Atmospheres, multiply by 0.986923. For example, 25 bar equals 24.6731 atm.
How many Atmospheres are in 1 Bar?
There are 0.986923 Atmospheres in 1 Bar.
How many Bar are in 1 Atmosphere?
There are 1.01325 Bar in 1 Atmosphere.
What is the formula for Bar to Atmosphere conversion?
The formula is: multiply by 0.986923. This means 1 bar = 0.986923 atm.
Is a Bar bigger than a Atmosphere?
Yes. One Bar is larger than one Atmosphere because 1 bar equals 0.986923 atm, which is less than 1.
When do you need to convert between Bar and Atmospheres?
A non-SI unit of pressure defined as exactly 101,325 pascals, corresponding to the standard sea-level atmospheric pressure as adopted by ISO 2533 and the BIPM SI Brochure. Bar and Atmosphere are both pressure units, so conversion comes up whenever one source of information uses one unit and another uses the other — a classic cross-reference challenge in engineering, trade, travel, and everyday life.