Distance programs earn leg-by-leg, so a business long-haul plus an economy connection is scored per leg and summed. Revenue programs (AA, BA, IB…) earn on the whole ticket price and ignore routing and class. Enter each carrier's fare to get points per dollar. Tier comes from the sidebar.
Pick which saved trips to include, then add alternate carriers to each to see how the totals would change.
Enter the loyalty point balance you're starting from. The timeline will show how your balance changes over time as you complete trips and earn points. Priority goes: Trip -> Segments -> Return Trips. Status starts from the initial status selected and changes as milestones are reached, if they are beneficial to your earning. Regarding revenue based fare, it is assumed you paid equal amounts for the outbound and return legs, so the points earned are split evenly between the two.