[robalfonso]

I've done this as well, but I moved to 500kg load cells on the bed legs for reliability.

2 Load cells one on each back leg of the bed. Upside too is I've been able to discern things like, sitting on the edge of the bed to put on shoes etc based on the weights.

Esphome, load cell, and hx711 chip for the load cell comes out to about $40-$50 each leg.

[jojobas]

You could get away with using just two cheaper 50kg load cells with some tinkering (i.e. a bracket and screw to send the just right fraction of the load to the cell, on just two legs).