Use this handy chart to convert back pressures into different units of measure.

psi	Bar
72.5	5.0
100.0	6.9
144.9	10.0
362.4	25.0
500.0	34.5
724.7	50.0
1,000.0	68.9
1,449.5	100.0
1,500.0	103.4
2,000.0	137.9
2,174.2	150.0
2,500.0	172.4
2,899.0	200.0
3,000.0	206.8
3,500.0	241.3
3,623.7	250.0
4,000.0	275.8
4,348.5	300.0
4,500.0	310.3
5,000.0	344.7
5,073.2	350.0
5,500.0	379.2
5,798.0	400.0
6,000.0	413.7
6,500.0	448.2
6,522.7	450.0
7,000.0	482.6
7,247.5	500.0
7,500.0	517.1
7,972.2	550.0
8,000.0	551.6
8,500.0	586.1
8,696.9	600.0