Regeneration is the foundation of the game and one of the most important values in it. Every minute, you regenerate chakra/stamina equal to your regen. It's used for pretty much everything.

• Note: This does not include bloodline regen, village regen, sleeping regen, etc.

Villages have their own regeneration. Villages get their funds from raiding and these funds usually go to regen. Village regen is added to every villager, regardless of whether or not they're inside the villages' walls. Lower ranks receive less of this boost while higher ones receive more. The cost of village regeneration is based on villagers with higher ranks costing more.

• Homes are the most basic way to increase your regeneration. One of your first priorities should be to obtain a house. Going to sleep adds the house's comfort value to your regeneration. Buying a better home is an effective way to increase your regeneration.
• Bloodlines also often have regeneration. Rolling for one at genin or obtaining a bloodline item are viable ways to increase your regeneration.
• Raiding can also help your regeneration. Raiding earns village funds which are often used to buy regeneration. So an active village is also a regen-filled one.
• Reputation can be used to buy temporary regeneration, which is boosted regeneration for a week. Keep in mind the village joining penalty also affects this; so don't say we didn't warn you.
• Ranking up is also a very effective way of increasing regeneration. It's advised to choose what rank you would like to stay at from the beginning and get to it as fast as possible for boosted regeneration.

• Joining a village cuts your regeneration in half for one day. Then, for three more days, it stays at 60%. This affects all of your regeneration, including temporary regeneration.
• Training a special jutsu reduces your regeneration by 1 for as long as you are training it.
• Having a job reduces your regeneration by 0.2 for AS jobs, 0.4 for genin jobs, and 0.6 for chunin jobs.
• Going into battle will cut your chakra/stamina regen to 1/3. You cannot regen health points while in battle.
• Surgery will decrease your regen to 80% while you are still recovering.

Note: Any increases and/or decreases being removed are not listed but also affect your regeneration.

Total (asleep) without any status effects

5 + .1*(Village Regen) + Bloodline + House

7 + .3*(Village Regen) + Bloodline + House

10 + .5*(Village Regen) + Bloodline + House

14 + .75*(Village Regen) + Bloodline + House

19 + Village Regen + Bloodline + House