I've created simulation chart in Excel if u want to check your current (phantom) level in helldivers 2

just download as xlsx or copy to your google drive and edit just yellow box with your current XP (in career details on ship at the bottom). Alternatively you can use python script by updating single highlighted (with comments) varriable with your current XP.

Obviously it depends on assumption that further levels will have required amount of XP calculated with same algorithm as levels <=150