1 · Where you're starting
Check your Atmos account for this number. It only moves the progress bar; it doesn't change what new flights earn.
2 · Add what you'll earn
Elite bonus is paid on base points from paid flights: Silver +25%, Gold +50%, Platinum +100%, Titanium +150%. oneworld status earned with another airline (for example AAdvantage or JAL Emerald) doesn't add an Atmos bonus. Bonuses come from the program you credit the flight to.
Hotels, cruises, rental cars, rideshare, shopping and dining partners all pay different and sometimes changing amounts. Plug in what your quote or account says.