To discover your power level add your height in inches with how much you weigh. Then, add how much you can bench press on to that.
Add that by your age, divide that number by 50, and you have just figured out your power level!
The average human power level is between 5-8; For example, in the beginning of the Radditz saga, there is a farmer with a shotgun in his hand. His power level is at level 5.