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You can find a competition near you by going to the builders database.
Robots are divided into different weight classes so your robot doesn't have to fight another robot that is twice it's weight. Some competitions have variations on the standard weights if the robot is autonomous or if it is a walker but for the most part what you see below is typical. The names of the weight classes aren't always agreed upon but typically people use the following
| Weight | Name |
| 150g | Fairy / British Antweights: These tiny guys are hard to make. |
| 1 pound | Ant: This is a very popular weight class with a lot of events to compete in. |
| 3 pounds | Beetle: This weight class is starting to catch on, it has a lot of the appeals of the 1 pound robots but they are typically a little easier to build. |
| 6 pounds | Mantis: This is a relatively new weight class with only few robots right now. We'll see if it catches on. |
| 12 pounds | Hobby: This is a very popular weight class. It is still relatively cheap and easy to build a robot of this size, but they have some of the appeal of the bigger weight classes and can make quite a bang. |
| 30 pounds | Feather: At this weight class the robot becomes difficult to contain and requires a fairly heavy duty arena. This limits the number of competitions they can compete in but there are still several to choose from. |
| 60 pounds | Light: In the old BattleBots competitions, these use to be the smallest robots, hence the name "light weight" for a relatively big robot. |
| 120 pounds | Middle: The power in this weight class is very impressive, but they start to become difficult to lift! Ugh! |
| 220 pounds | Heavy: If you are building a robot this big, you either need to be part of a team or very big and strong. It is not easy to haul one of these things around. |
| 340 pounds | Super Heavy: Only a few events can contain these big boys. They are very expensive to build and it is very expensive to run a competition with them. |
| 390 pounds | Mechwars 390: Where everything is bigger and better. TC_Mechwars runs a slightly bigger weight class |