Passive perception is a very underrated but also super common mechanic of Dungeons & Dragons. This skill has its own place on the character sheet since it comes up so often, but a lot of players still don’t know how it works. So – what is it? In the simplest terms, it’s this tabletop RPG’s version of Spidey-sense and shows how much a character is aware of their surroundings when simply wandering around and minding their own business. Unlike the standard skill of Perception, the passive version doesn’t require any active examination or rolling a d20 and can help you notice something you aren’t actively looking for. This can come in handy during combat and while exploring, for spotting secret doors, hidden traps, or even a character who’s trying to sneak around or hide from the party.
If you want to learn more about this very interesting mechanic of DnD 5e, figure out how to calculate it for a character, and see examples of when it’s used, stick around until the end of this quick and easy guide.
When To Use Passive Perception?
Whether a skill check will be active or passive depends on the situation and is completely up to the DM, but it works something like this – let me give you an example.
You and your party walk into a museum that currently exhibits the crown jewels. It’s after hours and there aren’t any guards there, but all the necklaces, scepters, and crowns are out in the open. At that point, a player might realize something is fishy and there might be booby traps or silent alarms that go off if you touch any of the valuables. At that point, somebody would probably tell the DM “I look around the room and check out whether there are trip wires or other traps” and he’d make you roll a d20 for a Perception check. Since you know what you are looking for and you are paying attention to everything around you, this would constitute an active skill check.
On the other hand, if nobody from the party seemed alarmed or suspicious about traps around them, the DM might decide to automatically check the Passive Perception scores of the party and tell the members of the party what they can notice around the room. This might lead to nobody noticing the traps and triggering them.
Another great use for Passive Perception in 5e is if you’re trying to surprise attack an opponent (or the other way around). You can read all about the Surprise Round in DnD 5e in our guide on it, but the gist is: if you’re trying to use stealth to do a sneak attack the DM will compare your Stealth check to the Passive Perception score of your enemies. If you rolled a higher number, your surprise sneak attack will be successful.
Does Passive Perception Work While a Character Is Sleeping?
This question can spark a very lively debate anytime Passive Perception is even mentioned. In one corner you have players who believe that asleep characters should be considered unconscious and therefore completely unaware of their surroundings. In the other corner are the ones who believe that, even when asleep, characters would be aware if there was some commotion around them and would wake up. I would personally more likely side with the side that lets players use Passive Perception even when asleep because it’s better to be a kind and generous God. Oh sorry, I meant DM.
Even though there isn’t an official judgment in any of the official sources, Xanathar’s Guide to Everything gives us a glimpse into how this works in the section on the mechanics of sleeping:
Whispers don’t disturb sleep unless a sleeper’s passive Wisdom (Perception) score is 20 or higher and the whispers are within 10 feet of the sleeper. Speech at a normal volume awakens a sleeper if the environment is otherwise silent (no wind, birdsong, crickets, street sounds, or the like) and the sleeper has a passive Wisdom (Perception) score of 15 or higher.
How to Calculate Passive Perception in DnD 5e
A very interesting aspect of Passive Perception is that, unlike its active cousin, doesn’t rely on your luck at rolling the dice. It actually has a constant value, a “score” if you will, that you can very easily calculate.
In 5e, Passive Perception = 10 + Wisdom modifier + Proficiency Bonus (if you have one)
The Player’s Handbook gives 5e fans all the information on how passive checks work and how to calculate them in the section on Ability Checks, so if you need more details, feel free to look there.
Can You Increase Your Passive Perception Score?
Since this skill is used so often, it makes sense that a lot of players would want to boost their score as much as possible, but is it possible? Well, the answer is yes, it is possible, but your options are pretty limited.
The first way to get a high score is to choose a class that needs a high Wisdom score like a Cleric, Druid, or Paladin. Or you could go for a bard or rogue since they get the expertise ability that can be used for Perception.
If you’re already kinda stuck with your class or don’t want to play the ones I just mentioned, you could choose the Observant feat. The players who do so get an extra +5 to their Passive Perception.
The third way you could accomplish this increase is to give yourself an advantage on Wisdom through spells like Enhance Ability or Skill Empowerment, but these are usually time sensitive and only temporary.
Why Use Passive Perception?
I can see why some players wouldn’t care for Passive Perception that much – if their base score is typically low, they might feel like they’re a bit out of the loop and that their character is a bit clueless and ignorant of their surroundings. In this case, they might prefer the active check since they would have more of a chance to roll a high number.
I, on the other hand, am a huge fan of this passive check, and let me tell you why. If a DM utilizes Passive Perception the right way, he can keep the element of surprise during the campaign and make players linger on the edge of their seats. If a DM only relies on active Perception and asks the players to roll a check the second they come into a room, even if they fail it, they will know something is going on.
On the other hand, if it’s required for further storytelling, a DM can even prevent players from passing some Passive Perception checks (if their passive score is naturally low) to build some suspense. In the museum situation that I mentioned in a previous section, a DM can let the party trigger a silent alarm just by them failing a Passive Perception check and this can take his story in the direction he wants.
Lastly, it’s simply more convenient for a DM to check the scores in the background than constantly having d20s rolling around the table until everyone completed their Perception checks.
