Passive Perception = 10 + Wisdom modifier + proficiency bonus if proficient in Perception + other applicable bonuses
Use the character’s Wisdom score to find the Wisdom modifier
Add the proficiency bonus only if the character is proficient in Perception
Add expertise bonuses if the character has expertise in Perception
Add any situational or permanent bonuses that apply to Perception
Do not roll dice for passive Perception
Use the final total as the character’s passive Perception score