Trade Value(s)

2nd year in dynasty, but when offering a trade/sending a trade how is the best way to evaluate value? Does anyone use a trade calculator from other sites?

for ex…I gave up Kelce and Conner for Dorsett and J Jacobs…I feel like I could have gotten more since Kelce was included but im 0-3 in that league so im preparing for next year ( received Mahommes and D Mont) in previous trades so I feel like im off to a good start next season.