To calculate the changes in the League of Legends meta, you'll need data on the champions and their popularity over time.

Here are the steps to calculate the changes in the League of Legends meta in Excel:

- Acquire data on the popularity of each champion over time. This data can come from a variety of sources, such as websites that track champion pick and ban rates, or data from professional League of Legends matches.
- Organize the data in an Excel spreadsheet. Each row should represent a single champion, and each column should represent a different time period (such as a month or patch).
- Create a formula to calculate the change in popularity for each champion between two time periods. This can be done by subtracting the popularity in the first time period from the popularity in the second time period.
- Repeat the formula for all time periods and all champions to create a table of meta changes over time.
- Use Excel functions such as SUM, AVERAGE, and MAX to aggregate the data and get an overall view of the changes in the League of Legends meta.
- You can also create charts to visualize the data and make it easier to understand.

By using Excel to calculate the changes in the League of Legends meta, you can get a clear picture of how the popularity of different champions has changed over time, which can be useful for understanding the state of the game and making informed decisions about which champions to play.