Bar to Atmosphere Formula
atm = bar x 0.986923
Conversion factors follow SI relationships published by BIPM and NIST, where those standards apply.
Bar to Atmosphere Converter
Quick Answer
1 bar = 0.986923 atm
Formula: Atmosphere = Bar x 0.986923
Quick values
Worked examples
Convert 1 bar to atm
atm = 1 x 0.986923
Result: 1 bar = 0.986923 atm
Convert 10 bar to atm
atm = 10 x 0.986923
Result: 10 bar = 9.86923 atm
Convert 100 bar to atm
atm = 100 x 0.986923
Result: 100 bar = 98.6923 atm
About Bar and Atmosphere
Divide bar by 1.01325 to get standard atmospheres (or multiply by 0.986923). 1 bar is 0.986923 atm — slightly below one atmosphere.
Category hub: Pressure Conversion · Conversion charts · Conversion formulas
Bar to Atmosphere Conversion Table
| Bar (bar) | Atmosphere (atm) |
|---|---|
| 0.5 bar | 0.493462 atm |
| 1 bar | 0.986923 atm |
| 1.01325 bar | 1 atm |
| 2 bar | 1.97385 atm |
| 5 bar | 4.93462 atm |
| 10 bar | 9.86923 atm |
| 20 bar | 19.7385 atm |
| 50 bar | 49.3462 atm |
Browse all conversion charts → · Browse conversion formulas →
Practical use cases for Bar to Atmosphere
Tire and Vehicle Service
Passenger-car tire placards in the US are often in PSI, while many gauges and shop manuals list kPa or bar. Converting before inflation avoids under- or over-pressurizing a tire.
HVAC and Hydronics
Boiler, chiller, and duct-pressure specs mix PSI, kPa, and inches of water. Field techs convert so setpoints match the equipment nameplate.
Process and Plant Engineering
P&IDs and relief-valve datasheets may use PSI, bar, or kPa depending on the region. Accurate conversion is required before sizing piping and safety devices.
Meteorology and Aviation
Altimeter and station-pressure reports use inHg, hPa, or kPa. Pilots and weather desks convert between those scales for briefings and QNH settings.
Medical and Laboratory Gases
Cylinder pressures and ventilator settings are published in different units by manufacturer and country. Clinicians convert to the unit on the local gauge.
Hydraulics and Pneumatics
Pump and compressor curves are often published in bar or kPa while US shop drawings stay in PSI. Converting keeps actuator force and regulator settings consistent.
Bar to Atmosphere FAQs
Common questions about converting bar to atmosphere.
How do you convert bar to atmospheres?
Divide bar by 1.01325. Example: 1 bar = 0.98692 atm, 1.01325 bar = 1 atm, 10 bar = 9.8692 atm.
What is 2 bar in atmospheres?
2 / 1.01325 ≈ 1.9738 atm. A “2 bar” process line is not quite “2 atmospheres” if the spec used the standard atmosphere.
Do weather maps that say 1013 mbar mean 1 atm?
1013 mbar = 1.013 bar ≈ 1.000 atm. That is why sea-level charts hover near 1013 hPa/mbar. This page converts the bar unit, which is 1,000 mbar.
Is this bar to atm or technical atmosphere (at)?
This page uses the standard atmosphere (101,325 Pa), not the technical atmosphere (at, 1 kgf/cm²). Use the technical-atmosphere unit when a datasheet says “at”.
Charts and printable PDF
Use the matching bar / atmosphere chart when you need a printable table or offline reference.
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