A bar is a metric unit of atmospheric pressure equal to 100000 Pascals or 100 kilopascals. One bar is slightly less than the average pressure of the earth’s atmosphere at sea level which is 1.01325 bar or 1 atm. The unit is not part of the International System of Units (SI). You can convert Bars to other units here by enter amount of if into green input below. You can also check some basic conversions in Bars Conversion Table.