I am trying to calculate my future value if i invest 5k into the S&P 500

I am using a annual rate of return of 8% and my starting value is 5k. After 10 years my capital would be 9k in total right with a total rate of return of 4k or am i doing something wrong?

Whenever i try to use rate of return calculators i get different number usually higher. For example i used one where i got 11,098$ somehow

Its probably much easier to calculate but i am so confused. Btw i know it pays out dividends too but i didn’t include it in my calculation.