Bars (bar)
The bar is a metric unit of pressure equal to 100,000 pascals, very close to atmospheric pressure at sea level (1 atm = 1.01325 bar).
Convert bars to any pressure unit
1 bar = 14.50377377 pounds per square inch
Quick facts
- Unit
- Bar (plural: bars)
- Symbol
- bar
- Measures
- Pressure / Stress
- System
- Metric (SI)
- Equals
- 100,000 pascals
- Definition
- Exactly 100,000 Pa (100 kPa).
1 bar in other units
| Pounds per square inch | 14.50377377 psi |
| Kilopascals | 100 kPa |
| Pascals | 100,000 Pa |
| Standard atmospheres | 0.9869232667 atm |
| Millimeters of mercury | 750.0615758 mmHg |
| Hectopascals | 1,000 hPa |
| Megapascals | 0.1 MPa |
| Inches of mercury | 29.5299833 inHg |
What is a bar?
The bar is a metric unit of pressure equal to 100,000 pascals, very close to atmospheric pressure at sea level (1 atm = 1.01325 bar). It is not an SI unit but is widely used in Europe for tire pressures, water systems, espresso machines, diving and industry.
The name comes from the Greek "baros", weight.
Where the bar sits among pressure units
The bar is number 34 of 44 on our scale of pressure units, ordered from smallest to largest.
What bars are used for
- Tire pressures in Europe (2.2–2.5 bar)
- Espresso machines (9 bar)
- Diving and gas cylinders
- Hydraulics and industrial equipment
- Weather (as millibars)
Bars in real life
- An espresso machine brews at about 9 bar
- Every 10 m of seawater adds about 1 bar
- A car tire is about 2.2–2.5 bar (gauge)
Top bar conversions
Common amounts of bars
- 0.1 bar
- 0.2 bar
- 0.3 bar
- 0.4 bar
- 0.5 bar
- 0.6 bar
- 0.7 bar
- 0.8 bar
- 0.9 bar
- 1 bar
- 1.5 bar
- 2 bar
- 2.5 bar
- 3 bar
- 3.5 bar
- 4 bar
- 4.5 bar
- 5 bar
- 6 bar
- 7 bar
- 7.5 bar
- 8 bar
- 9 bar
- 10 bar
- 11 bar
- 12 bar
- 13 bar
- 14 bar
- 15 bar
- 16 bar
- 17 bar
- 18 bar
- 19 bar
- 20 bar
- 21 bar
- 22 bar
- 23 bar
- 24 bar
- 25 bar
- 26 bar
- 27 bar
- 28 bar
- 29 bar
- 30 bar
- 31 bar
- 32 bar
- 33 bar
- 34 bar
- 35 bar
- 36 bar
- 37 bar
- 38 bar
- 39 bar
- 40 bar
- 41 bar
- 42 bar
- 43 bar
- 44 bar
- 45 bar
- 46 bar
- 47 bar
- 48 bar
- 49 bar
- 50 bar
- 51 bar
- 52 bar
- 53 bar
- 54 bar
- 55 bar
- 56 bar
- 57 bar
- 58 bar
- 59 bar
- 60 bar
- 61 bar
- 62 bar
- 63 bar
- 64 bar
- 65 bar
- 66 bar
- 67 bar
- 68 bar
- 69 bar
- 70 bar
- 71 bar
- 72 bar
- 73 bar
- 74 bar
- 75 bar
- 76 bar
- 77 bar
- 78 bar
- 79 bar
- 80 bar
- 81 bar
- 82 bar
- 83 bar
- 84 bar
- 85 bar
- 86 bar
- 87 bar
- 88 bar
- 89 bar
- 90 bar
- 91 bar
- 92 bar
- 93 bar
- 94 bar
- 95 bar
- 96 bar
- 97 bar
- 98 bar
- 99 bar
- 100 bar
- 110 bar
- 120 bar
- 130 bar
- 140 bar
- 150 bar
- 160 bar
- 170 bar
- 180 bar
- 190 bar
- 200 bar
- 210 bar
- 220 bar
- 230 bar
- 240 bar
- 250 bar
- 260 bar
- 270 bar
- 280 bar
- 290 bar
- 300 bar
- 310 bar
- 320 bar
- 330 bar
- 340 bar
- 350 bar
- 360 bar
- 370 bar
- 380 bar
- 390 bar
- 400 bar
- 410 bar
- 420 bar
- 430 bar
- 440 bar
- 450 bar
- 460 bar
- 470 bar
- 480 bar
- 490 bar
- 500 bar
- 600 bar
- 700 bar
- 800 bar
- 900 bar
- 1,000 bar
- 1,200 bar
- 1,500 bar
- 2,000 bar
- 2,500 bar
- 3,000 bar
- 4,000 bar
- 5,000 bar
- 10,000 bar
Convert bars to all 45 other units
Metric (SI)
- bar to kPa
- bar to Pa
- bar to hPa
- bar to MPa
- bar to mbar
- bar to GPa
- bar to barg
- bar to kbar
- bar to dbar
- bar to cbar
- bar to µbar
Atmospheres & mercury
Water column
US & imperial
- bar to psi
- bar to psig
- bar to ksi
- bar to psf
- bar to Mpsi
- bar to ozf/in²
- bar to LT/in²
- bar to tonf/ft²
- bar to pdl/ft²
Gravitational metric & CGS
Scientific
Convert to bars
Frequently asked questions
What is a bar?
The bar is a metric unit of pressure equal to 100,000 pascals, very close to atmospheric pressure at sea level (1 atm = 1.01325 bar).
How is the bar defined?
Exactly 100,000 Pa (100 kPa).
How many pounds per square inch are in a bar?
One bar equals 14.50377377 pounds per square inch.
How many kilopascals are in a bar?
One bar equals 100 kilopascals.
How many pascals are in a bar?
One bar equals 100,000 pascals.