The DynastyMath trade calculator applies a simple +15% to tight end values when TE premium is on. Scoring varies by league, so treat it as a starting point.
What is TE premium?
TE premium (TEP) awards tight ends extra points per catch, commonly 1.5 PPR instead of 1.0. It narrows the gap between tight ends and wide receivers, so elite TEs become much more valuable in trades.