How is experience gain calculated in agar.io? [duplicate]

The exact method of gaining XP is not known to the public. The current system is very unstable and buggy, sometimes getting deleted for no reason. If the method was known to the public, many people would start abusing it, so I don't believe that they will tell us exactly how. It has been noticed, however, that splitting into multiple cells seems to gain you the most XP, as noticed by Reddit user parls (third comment) here. Also, the maximum XP seems to be around 25k.

Across all play modes, it seems that XP can be gained quickly by splitting. If you are big enough to split into the maximum of 16 balls, and combine back in to one, you gain greater XP than if you got the #1 spot in free for all.

This is a common team tactic, but keep in mind that teams will lose mass faster from exchanging mass to frequantly.

Keep in mind that the bigger you are when you perform the split, the safer you will potentially be.

This answer is out of date.

The XP system is still being kept secret by the developer, as well as being subject to modifications.

However, a few discoveries have been made:

• You gain XP every second, depending on your mass.
• For a given mass, the more you are split, the more XP you get.
• There is a maximum of 25,000 XP per life.