What data source does FireCalc use?

[bobbyd]

I'd like to do some modeling myself and I'm looking for a S&P 500 dividend adjusted monthly data source or similar. Curious to know what data FireCalc is using.

 

[FREE866]

I'd like to do some modeling myself and I'm looking for a S&P 500 dividend adjusted monthly data source or similar. Curious to know what data FireCalc is using.

this calculator might be helpful


https://www.officialdata.org/us/stocks/s-p-500/2008?amount=100000&endYear=2022