The pressure lapse rate with altitude is equal to the density*g, and the density is proportional to pressure divided by (absolute) temperature.
At ISA sea level the density of air is 1.225 kg/m^3
1MBar = 100 N/M^2
g=9.80665M/s^2
Doing the calc thus gives change in height for 1MB = 8.324m or 27.3 ft