I had unbelievable performance! (excel help, please?)

[solon]

Attached is a graph of my performance for the year. The giant spike in the blue line is because I rolled over an old 401k.

Is there a way to show just the market performance, without showing gains from contributions?

[catccc]

IDK what the different colors represent, but here's one way to do it:
Add a row or column (parallel to your currently graphed data, under or next to) that includes your contributions.  Then another row or column with a formula to calculate the change in value excluding the contributions.  Then use the data in that new row or column to update your graph to include it.  Ta da!

[MDM]

Is Calculating personal returns - Bogleheads helpful?

[solon]

Is Calculating personal returns - Bogleheads helpful?

Yeah, that's it. Not those spreadsheets exactly, but I'm stealing the formulas from them. Thank you!