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Atmosphere to Bar

Professional atm to bar conversion.

Atmosphere
Standard atmospheric pressure at sea level (approx. 101,325 Pa).
Bar
Metric unit of pressure nearly equal to average atmospheric pressure at sea level.
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1.01325
Unit
  • Attopascal
    aPa
  • Femtopascal
    fPa
  • Picopascal
    pPa
  • Nanopascal
    nPa
  • Micropascal
    µPa
  • Millipascal
    mPa
  • Centipascal
    cPa
  • Decipascal
    dPa
  • Dyne per square centimeter
    dyn/cm²
  • Microbar
    µbar
  • Newton per square meter
    N/m²
  • Pascal
    Pa
  • Poundal per square foot
    pdl/ft²
  • Millimeter of water (4°C)
    mmH₂O
  • Kilogram-force per square meter
    kgf/m²
  • Dekapascal
    daPa
  • Pounds per square foot
    psf
  • Pound-force per square foot
    lbf/ft²
  • Centimeter of water (4°C)
    cmH₂O
  • Gram-force per square centimeter
    gf/cm²
  • Hectopascal
    hPa
  • Millibar
    mbar
  • Millimeter of mercury (0°C)
    mmHg (0°C)
  • Torr
    Torr
  • Millimeter of mercury
    mmHg
  • Inch of water (60°F)
    inAq (60°F)
  • Inch of water (4°C)
    inAq (4°C)
  • Kilonewton per square meter
    kN/m²
  • Kilopascal
    kPa
  • Centimeter of mercury (0°C)
    cmHg
  • Foot of water (60°F)
    ftAq (60°F)
  • Foot of water (4°C)
    ftAq (4°C)
  • Inch of mercury (60°F)
    inHg (60°F)
  • Inch of mercury
    inHg
  • PSI
    psi
  • Pound-force per square inch
    lbf/in²
  • Newton per square centimeter
    N/cm²
  • Ton-force (short) per square foot
    tonf/ft²
  • Kilogram-force per square centimeter
    kgf/cm²
  • Technical atmosphere
    at
  • Bar
    bar
  • Atmosphere
    atm
  • Ton-force (long) per square foot
    long tonf/ft²
  • Megapascal
    MPa
  • Newton per square millimeter
    N/mm²
  • Kip-force per square inch
    kipf/in²
  • KSI
    ksi
  • Kilogram-force per square millimeter
    kgf/mm²
  • Ton-force (short) per square inch
    tonf/in²
  • Ton-force (long) per square inch
    long tonf/in²
  • Gigapascal
    GPa
  • Terapascal
    TPa
  • Petapascal
    PPa
  • Exapascal
    EPa
Unit
  • Attopascal
    aPa
  • Femtopascal
    fPa
  • Picopascal
    pPa
  • Nanopascal
    nPa
  • Micropascal
    µPa
  • Millipascal
    mPa
  • Centipascal
    cPa
  • Decipascal
    dPa
  • Dyne per square centimeter
    dyn/cm²
  • Microbar
    µbar
  • Newton per square meter
    N/m²
  • Pascal
    Pa
  • Poundal per square foot
    pdl/ft²
  • Millimeter of water (4°C)
    mmH₂O
  • Kilogram-force per square meter
    kgf/m²
  • Dekapascal
    daPa
  • Pounds per square foot
    psf
  • Pound-force per square foot
    lbf/ft²
  • Centimeter of water (4°C)
    cmH₂O
  • Gram-force per square centimeter
    gf/cm²
  • Hectopascal
    hPa
  • Millibar
    mbar
  • Millimeter of mercury (0°C)
    mmHg (0°C)
  • Torr
    Torr
  • Millimeter of mercury
    mmHg
  • Inch of water (60°F)
    inAq (60°F)
  • Inch of water (4°C)
    inAq (4°C)
  • Kilonewton per square meter
    kN/m²
  • Kilopascal
    kPa
  • Centimeter of mercury (0°C)
    cmHg
  • Foot of water (60°F)
    ftAq (60°F)
  • Foot of water (4°C)
    ftAq (4°C)
  • Inch of mercury (60°F)
    inHg (60°F)
  • Inch of mercury
    inHg
  • PSI
    psi
  • Pound-force per square inch
    lbf/in²
  • Newton per square centimeter
    N/cm²
  • Ton-force (short) per square foot
    tonf/ft²
  • Kilogram-force per square centimeter
    kgf/cm²
  • Technical atmosphere
    at
  • Bar
    bar
  • Atmosphere
    atm
  • Ton-force (long) per square foot
    long tonf/ft²
  • Megapascal
    MPa
  • Newton per square millimeter
    N/mm²
  • Kip-force per square inch
    kipf/in²
  • KSI
    ksi
  • Kilogram-force per square millimeter
    kgf/mm²
  • Ton-force (short) per square inch
    tonf/in²
  • Ton-force (long) per square inch
    long tonf/in²
  • Gigapascal
    GPa
  • Terapascal
    TPa
  • Petapascal
    PPa
  • Exapascal
    EPa
Precision: 8 decimal places

Logic & Formula

To convert Atmosphere to Bar, we use the specific conversion ratio for this category. 1 atm is equal to 1.01325 bar.

Value in bar = (Value in atm * 101325) / 100000

Unit Definitions

Atmosphere

Standard atmospheric pressure at sea level (approx. 101,325 Pa).

Bar

Metric unit of pressure nearly equal to average atmospheric pressure at sea level.

Verified 2026 Standards
Industrial Precision

How to convert Atmosphere to Bar?

Enter the value in Atmosphere, choose the target unit Bar, and the result updates instantly. This page also includes the conversion formula and a quick reference table for verification.

Formula: Value in bar = Value in atm × 1.01325

Common Conversions Table

Value (atm)Result (bar)
11.01325
1010.1325
2525.33125
5050.6625
100101.325
10001013.25

FAQ

What is the conversion formula from atm to bar?
Value in bar = Value in atm × 1.01325
What is the smallest unit in Pressure?
The smallest unit (as defined on this site) is: Attopascal (aPa). For higher precision, convert using a smaller unit first.
Are the results accurate?
Yes. Conversions run locally in your browser using verified ratios and display up to 8 decimals. Some categories like temperature and fuel use specialized formulas.

About this conversion

This page converts Atmosphere to Bar using verified ratios and includes tables, examples, and FAQs for quick verification.

Atmosphere
Standard atmospheric pressure at sea level (approx. 101,325 Pa).
Bar
Metric unit of pressure nearly equal to average atmospheric pressure at sea level.

Formula and precision

Value in bar = Value in atm × 1.01325
1 atm is equal to 1.01325 bar.
Yes. Conversions run locally in your browser using verified ratios and display up to 8 decimals. Some categories like temperature and fuel use specialized formulas.
  • Use smaller units for higher precision, then convert back if needed.
  • Temperature and fuel categories can’t be reduced to one constant multiplier.
  • Symbols vary by region (US/UK gallons, metric vs. imperial abbreviations).
  • For engineering work, validate with a second reference and keep unit symbols.

Quick examples

Example: 1 atm = 1.01325 bar.

Value (atm)Result (bar)
11.01325
12.512.665625
5050.6625
100101.325

Common mistakes and definitions

Pressure is often reported as absolute or gauge. Make sure your source values use the same reference before converting (especially in HVAC and engineering specs).
  • Confusing absolute pressure with gauge pressure.
  • Dropping prefixes (Pa vs kPa vs MPa) while comparing values.
  • Rounding too early before converting between small units.

Common Conversions Table

Atmosphere (atm)Bar (bar)
11.01325
22.0265
33.03975
55.06625
1010.1325
2525.33125
5050.6625
100101.325
250253.3125
500506.625
10001013.25

Category facts

Smallest unit (on this site)
Attopascal (aPa)
Largest unit (on this site)
Exapascal (EPa)

Popular conversions

Back to Pressure category Browse more related converters below.

Atmosphere → BarBar → PSIPascal → KilopascalTorr → PascalPSI → BarPascal → AttopascalPascal → Millimeter of water (4°C)Pascal → Bar

Related conversions

Convert Atmosphere to:
Kilogram-force per square centimeterTechnical atmosphereTon-force (short) per square footTon-force (long) per square footMegapascalNewton per square millimeterNewton per square centimeterPound-force per square inch
Convert to Bar from:
Inch of mercuryInch of mercury (60°F)Foot of water (4°C)Foot of water (60°F)KSIKip-force per square inchCentimeter of mercury (0°C)Kilogram-force per square millimeter

FAQ

How to convert Atmosphere to Bar?
Enter the value in Atmosphere, choose the target unit Bar, and the result updates instantly. This page also includes the conversion formula and a quick reference table for verification.
What is the conversion formula from atm to bar?
Value in bar = Value in atm × 1.01325
What is the smallest unit in Pressure?
The smallest unit (as defined on this site) is: Attopascal (aPa). For higher precision, convert using a smaller unit first.
Why can results differ between websites?
Different standards, rounding rules, and unit definitions can change results. This page shows the formula used for transparency.
Are the results accurate?
Yes. Conversions run locally in your browser using verified ratios and display up to 8 decimals. Some categories like temperature and fuel use specialized formulas.

More Related Pressure Tools

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Did you know?

Engineering pressure units including PSI, Bar, and Atmospheres. Precision is the cornerstone of our platform. We utilize 15-digit floating-point arithmetic to ensure results meet 2026 industrial and academic verification standards. Looking for other types of calculations? Explore our Main Dashboard for 100,000+ precision permutations.