How many bags of soil do I need for a 5 gallon bucket?

I'm curious, could you elaborate on the specific requirements for determining the number of bags of soil needed for a 5 gallon bucket? Are there any factors to consider, such as the type of soil or the desired depth in the bucket? Additionally, could you provide an estimated range or a formula to calculate the required amount more accurately? Understanding these details would be invaluable in ensuring a successful gardening project.