Happy Death Day: How Many Times Does Tree Die?

Stage 4: A Running Total...Maybe

As Tree wakes up for her tenth day, she cracks her neck, making it clear that this day follows on directly from her suicide the night before.

With a renewed sense of hope after Carter sacrificed himself for her, a self-improvement montage follows where Tree is less of a d*** to everyone around her, including her father, though none of this would require any additional time at all, and there's no reason to believe it didn't all happen on the very next day.

That evening, Tree plans an assault on Tombs at the hospital, taking his police guard at knife point, which leads to the most revealing nod towards Tree's true death count in the entire film.

He tells her, "I guess this is a really bad idea", to which Tree replies, "Well, so is dying for the sixteenth time." Yes, it's possible that Tree could be making a flippant, non-literal remark about how many times she's died, but the specificity and pointed delivery of the line does make it seem like it's meant to be taken literally.

Tree's comment seems to imply that she probably had a few botched attempts at intercepting Tombs where he overpowered her or the cop possibly shot her. It's also never made explicitly clear whether the earlier day where Tree walks around her campus in the nude is its own day or not, so it's possible that this could account for one (though this would contradict the "nine lives" line from earlier).

After killing Tombs and seemingly ending her torment, Tree's seemingly up to 15 deaths (accepting that her comment means she hasn't yet died for a sixteenth time), but in true horror movie style, of course, there's always time for one last surprise...