This is related to How can I increase my Vault Dweller's Happiness?, but slightly different.

I know what can raise a dweller's happiness, but what I want to know is what can raise it by how much?

For example, being a healthy, unaffected dweller with no job keeps a dweller's happiness at 50%. Then on the other hand, breeding raises it up to 100%. However I have noticed that there are fairly definitive "levels" throughout the vault. Generally at 100%, 90-80%, 75%, and 50%.

I know what can lower a dweller's happiness, and I know that breeding is a guaranteed boost to 100%, but I can't always afford to have a Vault full of pregnant women.

So, to clarify my question - What Vault features raise a dweller's happiness; and to what level?

  • Successfully rushing a room used to boost by 10%, but i last played so many versions ago that i don't know if its still accurate or not May 31, 2016 at 7:31
  • @godemperordune: I can confirm that it is still accurate... Failing a rush does also still lower by 10%
    – kl78
    May 31, 2016 at 8:04
  • ...and it can be applied more than once, so you can rush up the happines to 100% just by more successful rushes. Jun 1, 2016 at 11:22
  • I think that working in the appropriate room or training room increases happiness to 75%. I think everything in between 100 and 75 is due to partial happiness loss, probably from disasters.
    – DCShannon
    Jun 1, 2016 at 22:17

2 Answers 2


Happiness can be positively affected by several things, primarily (but not restricted to):

  • Mating. This will automatically raise a dweller's happiness to 100%.
  • Successfully rushing a room. Raises happiness by 10%
  • Healing a dweller. This will raise a dweller's happiness back to their original happiness. I.e. if a dweller's happiness was at 50%, they then took damage/radiation poisoning, which lowered their happiness, they will return to 50%[citation needed]
  • The Radio Room*. This automatically raises vault-wide happiness.
  • Bottle and Cappy*. The Nuka-Cola mascots occasionally visit your vault (if you have completed the "Nabbed from Nuka-World" event) and raise vault-wide happiness for a short time.

Happiness can also be affected negatively in several ways as well, including:

  • Dying. This can severely affect dweller happiness, often causing it to drop to minimal levels
  • Failing a rush. Unsuccessfully rushing a room can cause dwellers to lose 10% happiness.
  • Getting sick/injured. Taking large amounts of damage or radiation poisoning can cause dweller happiness to drop.
  • Not enough food/water. If the vault supply stores drop below the minimum requirements, vault-wide happiness will be reduced. This may also be applicable to losing power.
  • Dead bodies. If a dweller has died in a room, all other dwellers in that room will lose significant levels of happiness. (May affect vault-wide happiness).

*Sources needed for how much these affect happiness.


Playing on PC. I had one male dweller with happiness at 10%. After breeding his happiness was 72% - and increase of 62%. I didn't check his happiness immediately after breeding; I checked it after I sent him back to his assignment. This time lapse may account for the extra 2%. My guess is the actual increase was 60% in this case.

  • Happiness normally increases to 100% after mating. If it was less than 100%, I would suspect another factor, like a disaster in the room before you looked at him.
    – DCShannon
    Jul 21, 2016 at 22:06
  • I suspect incorrectly. My little dude walked to the elevator, went down two flights, entered the Med room, and I checked him immediately, possibly 6-7 seconds after mating.
    – Dervacumen
    Jul 22, 2016 at 19:40
  • You suspect incorrectly. My little dude walked to the elevator, went down two flights, entered the Med room, and I checked him immediately, possibly 10 seconds after mating. And when I looked at his happiness level at 72, it raised to 73, 74, 75... in roughly 6 seconds. So it was going up, not down.
    – Dervacumen
    Jul 22, 2016 at 19:47
  • Well that's super odd, then. Without more information I would chalk that up to a bug. Mating raises happiness to 100%.
    – DCShannon
    Jul 22, 2016 at 20:53
  • @Dervacumen Happiness does not shoot up immediately. It will slowly rise to match whatever level the previous activity dictates. So, after mating, a dweller's happiness will slowly rise (as you saw) until it reaches 100, if not immediately affected by other situations (sickness, proximity to dead bodies, etc.)
    – Ben
    Jan 10, 2017 at 23:03

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